100kw Boiler – Commercial gas condensing boilers

 

A 100kw boiler is suitable for large domestic and commercial applications, such as installation of a wet central heating and hot water systems for commercial buildings such as schools, sports and health centres, offices and hotels and communal heating schemes. This particular 100kW boiler is ErP “A” label / class condensing technology gas boiler with efficiency up to 108.83 % in condensing mode and is available in either natural gas or LPG.

100kw boiler; gb162 v2;basket ; installations;inc vat

100kW Gas Boiler – Natural gas or LPG

They are extremely versatile, usually in a wall hung condensing boiler installation although they can be used in a cascade boiler configuration, and we do a full range of time and space saving mounting frames, complete with flow and return headers, gas pipe pipework, low loss header or plate heat exchanger accessories options for primary heating circuit separation.

100kw gas commercial boilers

The unique feature of our condensing commercial boiler, is that they are constructed with two heat exchangers in one boiler casing, if one fails, you still have 50% of your heating demand functioning. You may also service one of the heating units while the other is still functioning, ensuring that your heating water system is never out of commission. This is a significant feature and advantage of these extremely versatile 100 kw wall hung condensing commercial boilers, and unique on the market as far as we know.

 

Two heat exchangers within our 100-kw gas fired boilers; Worcester gb162;bosch easycontrol ; search; inc vat

Two heat exchangers within our 100 kw gas fired boilers – Flexiheat UK

 

Servicing the individual boiler heat exchangers, even when used in a common flue heater configuration, is still possible as each heat exchanger has its own flue non return valve installed as standard.

So, what you have is a duty / standby or a duty assist gas boiler set up, but in a one gas boiler set up.

The other huge benefit this gives our 100kw boilers, is the modulation or turn down ratio is 20:1, there’s not another wall hung commercial condensing boiler on the market that has this range performance or ability to match the outputs or heating load required by the system and ensures minimal energy usage.

Best Heat Exchanger – Stainless Steel

Our wall hung condensing 100kw gas fired boilers have a high quality 28mm diameter stainless steel heat exchanger, unlike some of our competition that use an aluminium construction, which many heating engineers regard as inferior. This large diameter ensures the heating water has low pressure drops, guarantees lower risk of clogging, greater thermal heating efficiency, and greater ease of cleaning.

 

Condensing boiler 100kW – Product technical details

boiler 100kw; Worcester gb162 ; inc vat; cascade

Gas boiler 100kw R1K100 model technical data from Flexiheat UK

 

Download the Flexiheat Manual for R1K 100 Gas Fired Internal Boiler

28 mm diameter stainless steel water heat exchanger

Large diameter water ways- that prevent clogging and have low pressure drops.

Low Class 6 NOx emissions

Class leading NOx Class 6 emission outputs for boiler 100kw heat output installations.

Control accessories

This gas boiler is fully compatible with BMS systems that are often used in commercial buildings, when installed with our optional 0-10 volt interface card, that fits neatly into the mounting wall boiler.

For installations in large domestic properties, the boiler is fully compatible for connection to an “OpenTherm” controller, such as Nest, Alexa etc, which enables you to control the operation of the heating and hot water functions of the boiler with voice control, an Pad, computer or a phone app.

Dimensions

These commercial gas boilers have compact dimensions, for their heating power output.

R1K100 boiler dimensions; Worcester gb162; inc vat; England

R1K100 model dimensions from Flexiheat UK

 

Ensures minimal energy usage

The condensing mode of this particular boiler is at its maximum efficiency when the return water of the heating system is under the dew point of the by-products of the gas be used to power the boiler, which for natural gas is around 55C. The lower the return water temperature of the heating system installation, the more the boilers will condense. The boilers maximum output and efficiency performance is achieved when the return water is at 30C for the heating system resulting in minimal energy usage.

Multi boiler cascade system

You can cascade our 100kw boiler, with the ability of adding the various boiler outputs from our range i.e., 50kW, 60kW,75kW, 100kW or 120kW output boilers. We can cascade up to 960kW of installed output, with various combinations of boiler outputs to suit your commercial applications. We go into this in more depth on this webpage – Commercial gas condensing boilers

100 kw gas fired boiler alongside a multi boiler cascade system; Worcester gb162 ;inc vat; bosch easycontrol;cascade

Ultimately this boiler range is extremely versatile, and makes them suitable for everything from large domestic heating to industrial and commercial applications, either as a standalone boiler or used in a multi boiler cascade system either inline or a back to back configuration. They can also produce domestic hot water when used with an indirect hot water cylinder.

More Information / Prices

Four more information or prices on our 100kw boiler / commercial gas boilers in natural gas or LPG, which benefits from condensing technology and is up to 108.83% efficient, then please don’t hesitate to contact our sales team on 01202 822221 or use our email contact form via the contact us tab.

50kW Boiler – Natural gas or LPG

50 kW Gas Boiler

50kw boiler; 50 kw system boiler; worcester greenstar 8000; worcester bosch; greenstar 8000 life;

Our 50kW boiler which are a gas boiler powered by either natural gas or propane, covers the larger end of the domestic boiler market, and lets you expand into the light commercial boiler requirements that you may have.

They are an ErP “A” rated condensing gas boiler with efficiency up to 108.8 % at 30C return, with key features such as a stainless-steel heat exchanger, fully modulating 10:1 range – which is perfect for heat loading matching ensuring a long and efficient product life cycle and reduced running cost of your central heating system.

They are low NOx emission gas boiler, class 6 – which means they have the least impact on the environment. Available in natural mains gas or LPG. They can be used in a multi boiler cascade system if so required.

50kW system boiler

50kw system boiler; greenstar cdi classic; worcester's quietest boilers; Worcester bosch; worcester greenstar 8000; greenstar 8000 life;

50kw System Boiler from Flexiheat UK – Gas Fired

A system boiler, has a separate unvented cylinder for producing and storing domestic hot water. This ensures that a consistent supply of hot water can be delivered to a large number of showers and taps simultaneously. As a result, a its an excellent choice for a property with multiple bathrooms, that require higher domestic hot flow rate.

System boilers do away with the requirement for a water tank in the loft since they get their water straight from the mains (which is required with a regular boiler). They then heat the water to provide warm water for the cylinder as well as central heating.

You have to install a heating expansion vessel on the installation (by others) which is usual at this output boiler.

System pressure for the hot water is mains water pressure and the stored water gives an excellent flow rate, which overcomes some of the problems with combi boilers.

Because combi boiler they are only really meant to sustain one hot water outlet at a time, they are not well suited to households with a high demand for domestic hot water. Heating performance may well be reduced in high-usage households because combi boilers routinely switch the burner from the heating system to hot water when there is a hot water demand.

This boiler can be matched up to various sized cylinders to suit the home requirements for heating and hot water outputs, with effortless comfort.

However, should your flow rate requirement be under 20 Litres / minute, then a combi boiler could be the best option, as a combi boiler produces hot water on demand – look at our wall hung 50kW combi boiler webpage for more information. A combi boiler does both heating and DHW, and is a ErP A rated for reduced running cost.

Key features of our 50 kw gas boiler

Natural Gas or LPG fired

Our efficient boilers are available in natural gas or LPG (Propane) powered units and are a great central heating boiler replacement.

Output

The gas boiler heat output range is 49.19 kW down to 4.83 kW on an 80C/60C heating circuit, or 53.40 kW down to 5.15 kW heat output on a 50C/30C heating circuit

50kw gas fired system boiler- R1K50 model - technical data chart - Flexiheat UK; 50kw system boiler; worcester greenstar 8000; worcester bosch; greenstar 8000 life;

50kw gas fired system boiler- R1K50 model – technical data chart – Flexiheat UK

Modulation up to 1:10

For greater efficiency and reduced consumption both in heating and in domestic hot water production, when used with hot water cylinders

Low Class 6 NOx emissions-

NOx is a catch-all term for nitrogen oxides, which primarily include nitric oxide (NO) and nitrogen dioxide gas (NO2), our boilers have the lowest class emissions

System Pressure

These wall hung gas boilers can operate on a heating circuit with a minimum pressure of 0.3 to 3 Bar maximum

Quality components

All boiler sub components are leading brand products and are selected through careful research for a guarantee of quality and reliability over time

An improved display screen

With push control buttons – for easy control of this 50kW gas fired boiler. With fault codes , for fault finding if there’s ever a issue.

Unrivalled quality / price ratio

The best boiler performance at affordable prices

A wall hung boiler, with modern upgraded controls, that make it one of the most efficient and also one of the quietest boilers manufactured on the UK and Irish markets – at only 52 Decibels noise level – which makes a difference with quieter operation.

Heating output –

The gas boiler power will modulate the heat to the demand of the customers heating system installation, as the boilers output power range will go from from 50kw down to 5kW

Because the heat requirements of a gas boiler do not remain constant throughout the year owing to changing seasons, it may only be running at 20% of its capacity when it is warmer or at 80% when it is colder, our fully modulating 50kw gas boiler adapts to the heating system requirements, providing higher efficiency and reducing cost through wasted energy consumption.

Heating and Hot Water

Heating and hot water is provided by the boiler, via an indirect cylinder / calorifier – The heating side will heat your radiators or underfloor, whilst providing heat for the coil for the indirect cylinder

Controls

We do a range of controls that make your life easier, when it comes to controlling your boiler, from a basic room thermostat / programmer, with push control buttons all the way up to enhanced wireless internet controllers, such as Nest, Hive or bosch easycontrol thermostats, with features that provide you with the ability to regulate and control your heating from any extended location away from your home

Flue

We do a full range of flue options, such as horizontal or vertical kits, or additional flue lengths in 0.5 or 1 metre extensions that ensure installation in the home easy – they are 80 mm / 125 mm outside diameter concentric – thus room sealed

Space required for installation

This 50kw heating boiler range is compact and modern, through award winning innovation in design and operation, it is also one of the quietest boilers to date on the UK and Irish markets -allowing you to locate the unit in any room and keep you cosy in the cold winter months.

50kw Gas boiler - R1K50 Dimensions Flexiheat UK; worcester bosch; worcester greenstar 8000; greenstar 8000 life;

50kw Gas boiler – R1K50 Dimensions Flexiheat UK

 

Pipework connection detail

Pipework connections for the R1K50 gas boiler; worcester greenstar 8000; worcester bosch; greenstar 8000 life; registered in england; quote;

Pipework connections for the R1K50 ( at the bottom of the unit )

 

For easier installation, service, and maintenance, all installer touchpoints have been optimized, with a system pressure gauge located in an easy to read location on the front panel of these gas boilers which gives good peace of mind.

Download the Flexiheat Manual for R1K 50 Gas Fired Boiler

Frequently asked questions

How many radiators can a 50kw boiler run?

The number of radiators a 50kW output boiler can run, will depend on the property. The average sized radiator in a new build home is 1.5kW output, thus newer properties the boiler can run 30 rads to be safe. With older less insulated properties, you’re looking at around 18 to 20 rads, click here for more details

Is a higher kW boiler better?

Boiler are sized to overcome the heat loss from the property ( normally at -5C outside, to give an internal temperature of 20C) in the previous years , you could oversize a boiler, which was not good for efficiency and your fuel bill, but these days the quality end of the market ensures that the boilers are modulating, which means they will operate down to some very low outputs – our 50kW gas boiler will operate down to 4.83kW flow rate, which ensures better heat load matching of the system, with high efficiency and lower running costs , click here for more details.

Gas safe registered engineer

As always, we insist that any gas boilers are installed by a gas safe engineer, not only for the interest of safety, but also for the fact that it’s a legal requirement for the gas installation to be done by a suitable qualified person, so you can sit comfortably, knowing you heating and hot water system is safe. See here for the gas safe website.

Flexiheat UK

Should you require any more information on our 50kw boiler, then our customer services sales team is available (Trading hours -Mon Tue Wed Thu Fri – 8am to 5 pm) to give you a quote and check stock details. Please follow us on social media to keep up on our news, reviews etc.

Maximum current watcher system for our electric boilers

Maximum current watcher system for our electric boilers

So a UK home typically has a 100 Amp supply fuse , this means that all the home electrical appliances , whilst being used simultaneously should not draw over 100 Amps , otherwise the fuse can blow.

Following is a chart showing the electrical ratings of commonly used household appliances –

Firstly Electric Showers- these can have some high loads

Standard Shower Rating Watts (kW)          Maximum load from the supply (Amps)

6kW                                                                      26

9kW                                                                     39.13

9.5kW                                                                  41.3

10.5kW                                                                45.65

11.0kW                                                                47.82

Standard electrically powered items, such as laptops, mobile phone chargers, Televisions (42″ HD), printers and radio’s etc only use approximately 0.5 amps, and don’t generally cause a problem in relation to your electrical loadings, but the following list of appliances and the amps they can draw on a single phase electrical supply, will have –

Domestic Electric AppliancesAmps Used
Kettle13
Radiator ( Electric )8.5
Hair dryer10
Washing machine10
Toaster9
Tumble dryer11
Dishwasher10
Iron12.5
Microwave4.5
Vacuum cleaner9
Radiator (oil filled)13


UPDATE – We have now solved this common problem 
So why does this matter ? Well it matters because the larger the electric boiler you go in size , the more Amp’s you need available to power the boiler . You will generally find that in a standard 100 Amp – 240 Volt , single phased supply property , the largest boiler you can use is a 10 kW Boiler ( now a 15kW boiler-see the update below in red ) – why ? because this boiler will draw 45.5 Amps , which is getting close to half of the supply for a standard UK property , even when you consider a diversity factor ( which in layman terms means that not every electrical appliance would be on at the same time ) you are starting to possibly exceed your supply and tripping out fuses etc.

We now do a new range of electric boilers for central heating and / or domestic hot water, designated the “FHEL” range that can now utilise what we are calling the ” maximum current watcher” – it is basically a releasing relay (restriction of current). The relay monitors and controls the electric voltage in the whole house or flat and in the case of exceeding the permitted values of the electric current it reduces the input power of the electric boiler. All of this is done automatically, without any human intervention needed.This system will not only operate on our 240 volt / 1 Phase Electric boilers , but also our 400 Volt / 3 phase units as well. This now means that you can use our 15kW electric boiler model, in a property or flat with standard 240 volt, single phase with no worries or problems that the unit will trip out the main electric board.

For full details on this maximum current watcher, please download the following data sheet / instructions

Maximum Current Monitor – Instructions- for electric central heating boilers from Flexiheat UK

What are my other options? Well the best solution would be to get your electrical supply upgraded to Three Phase – Is it possible / How much is it to do this? I don’t know , we just supply the boilers – please contact UK Power Network , who are responsible for this here

Or another option may be to get a second 100 Amp supply to your property – Again , contact UK Power Network on the link above – this option may well work out cheaper than having three phase supplied to your property.

This system is used on our electric boilers – please see this webpage – https://www.flexiheatuk.com/product/electric-central-heating-boilers/

 

Lpg combi boiler – gas boilers – lpg boilers

lpg combi boiler; propane combi boiler; inc vat; lpg boilers; vat; high efficiency

LPG combi boilers range – R2KC from Flexiheat UK

 

There are over four million properties in the United Kingdom that aren’t connected to the mains natural gas network – and this is where LPG boilers, specifically LPG Combi boilers provide a viable solution to power your central heating and water heating requirements where a natural gas boiler can’t be installed.

There are other options such as electricity, wood, solid fuel, or oil boilers that can be used for off mains gas grid homes, but the most common boiler for these properties is a lpg combi boiler. This is due to the fact that LPG combination boilers not only produce less carbon emissions, thus reducing your home’s carbon footprint, they also save money as they are the most cost effective to purchase and install.

LPG (liquefied petroleum gas) is also a very efficient fuel too, and has much cleaner fuel emissions than an oil boiler, especially if they are condensing boilers- just like natural gas boilers even though they are both a fossil fuel.

This is why lpg combination boilers are the most popular new boiler for heating and hot water on the UK market, for properties that have no direct access to the main gas grid.

These lpg combination boilers are the ideal boilers to provide heating to a central heating system be it radiators or an underfloor heating system and also heat water for your domestic hot water requirements – Thus the term  “lpg combi boilers” as they supply both requirements.

How do lpg boilers work? quiet simply the same as a natural gas one – except the key difference – it’s fuel is LPG rather than natural.

Combination boiler lpg

Combi boilers are designed so you don’t have stored hot water, so there’s no water tank required. They heat the water on demand, which ensures high efficiency and lower heating bills, with the flow of water they can heat is related to the power output of the condensing boiler.

By not having stored hot water in a tank, they are more energy efficient as they are only heating the water that supplies your hot water taps or shower when you require it.

These days all boilers lpg combi type are all manufactured as a condensing boiler, to get the maximum high efficiency from not only the heating system but also the domestic hot water production too. As new lpg boilers are burning fuel at this high efficiency, the result is lower heating bills, due to the condensing function of the boiler. This also reduces carbon footprint in a new boiler, when compared to older non condensing oil boilers.

Our condensing lpg boilers achieve efficiencies of 105%, with many benefits such as a lower noise output than the majority of the lpg boilers on the UK market, and a patented stainless steel boiler heat exchanger, which is a pipe in pipe design, unlike some of the competition that use an inferior aluminium silicon heat exchanger. Our boiler ErP rating is “A” for both heating and hot water, to reduce a home’s carbon footprint.

Gas Boilers – Unique Heat Exchanger

The 12mm diameter internal stainless-steel pipe where domestic hot water is produced, is inside the patented main heat exchanger (28mm diameter). Its total length is 8 meters and this ensures you have a volume (approximately 6 Litres) of “warm water ready to go” as they say. The DHW production is always available and always in condensing operation, resulting in lower energy costs and bills.

combi heat exchanger; new lpg boiler ; inc vat; vat;

 

This design feature also reduces the chance of scale, something that older technology boilers that use a plate heat exchanger can suffer from. This is incredibly important in hard water areas– as our heat exchanger, with its high velocity and flexing in operation, reduces the ability for scale to build up, and prevents this happening ensuring a long life combination boiler with trouble free operation.

inc vat; vat; baxi heating uk; vaillant

Scale blocking the heat exchanger – older technology heat exchanger systems for DHW production

 

This unique and clever engineered solution for our heat exchanger system provides many advantages as opposed to the most popular brands of liquefied petroleum gas boilers, when you compare Worcester Bosch, Vaillant etc that use a traditional plate heat exchanger system, for the domestic water. This why many consider our boiler the best combination boiler on the market when looking for a new lpg boiler.

External Propane combi boilers

We also supply a range of external combination boilers, powered by propane, 24kw ,28kW or 34 kW output, same performance figures as our internal units. These units are fully weatherproofed, and manufactured to IPX5D standards.

External lpg combi boiler; easy installation

External lpg combination boiler

Lpg boiler

A lpg boiler works just like a natural gas or an oil boiler, just that it’s fuelled by liquid petroleum gas or LPG as it’s more commonly known. Whereas natural gas boilers use gas supplied by the main gas grid or mains supply as its also referred too. An Lpg boiler is using fuel supplied either via storage cylinders or a lpg bulk tank. Most lpg boilers, be they combination or system boilers they can be easily converted to mains gas (natural gas) via a simple conversion kit.

Liquid petroleum gas

LPG is an abbreviation for Liquefied Petroleum Gas, which is a mixture of gaseous hydrocarbons derived from natural gas and oil extraction (66 percent) as well as oil refining (34 percent). LPG is still a fossil fuel as such and hence not a true ‘clean’ energy source, but it is a very efficient fuel.

LPG does, however, release less carbon emissions per unit of energy than coal or oil. It emits 81% of the CO2 per kWh produced by oil, 70% of that of coal, and less than 50% of that emitted by coal-generated electricity distributed via the grid. (Source Wikipedia – LPG Gas )

The gas is a colourless odourless liquid when in its stored format. Often, for safety reasons an odorant is added to aid in the detection of any potential leaks.

Lpg cylinders supplying boilers lpg fired; vat; best lpg combi boiler

Lpg cylinders supplying boilers lpg fired

 

It is either stored in cylinders or a Lpg external storage tank. There are pros and cons of each storage system, and the most popular is a lpg tank storage system, as they use a relatively small space, to store a large amount of the dense liquid form of lpg, which holds a lot of energy efficient fuel.

propane bulk tank to feed the lpg combi boilers

 

These days a lpg storage tank comes with devices that monitor the quantity of gas in your tank and automatically inform your provider when it needs to be topped off. So, you never run out of fuel for your central heating system and to heat your hot water requirements.

Lpg combi boilers

The most common models of our huge range of lpg boilers are these –

24kW Lpg combi boiler

This lpg boiler is the smallest of our range of combination boilers. Even though the unit is called the 24kW – it will produce 24.79 kW of output when running at a 50/30°C flow and return temperature, as with all condensing boilers, the lower the return water under the dew point of the flue gases (generally 55C), the more efficient condensing boilers are.

Adversely if running at higher flow and return temperatures for the heating system, say 80/60C, then you’re not going to get the boiler to condense, and lose some energy efficiency, as it’s not recovering the heat from the flue gases. Thus at 80/60C our 24kW combi boiler will produce 22.7 kW of heating output – see the below technical data table for full details.

Our 24kW combination boiler is generally suitable for –

Apartments, flats and smaller 2 Bed houses, that have a maximum of 10 average sized radiators (these days the average radiator size is 1.5kW per rad on a new build) and that have one bathroom.

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24kW combi boiler dimensions Flexiheat UK

This lpg boiler fit inside a standard kitchen cupboard, being small and compact as you can see from the above detail.

Fully modulating

This boiler is a fully modulating boiler, which means it varies its output to the heating system requirements, this results in a higher energy efficiency, and reduced energy bills. This also means you can’t really oversize the heating side of the boiler as such, because it adapts to the heating system requirements of your flat, apartments or house. This modulation feature is common across all our range of propane gas boilers and natural gas boilers.

This 24 kW lpg boiler will modulate down to 2.9 kW of output.

Making the DHW performance the most looked at element of the boiler –

These days , it’s the domestic hot water (DHW) performance of the boiler , that people usually select the unit on.

First typical flow rates of fixtures found in a property are –

A standard shower head has a hot water demand of 7 or 8 litres a minute

Bath mixer tap – a modern bath tap has an approximate flow rate of 12 Litres /minute

Basin / cloakroom (spray tap type) – 2 litres/minute

Sink taps (standard type) – 4 litres /minute –

So typical winter time performance for the 24kW boiler is 11.5 Litres/min

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R2C 24kW compact lpg combination boiler – technical data from Flexiheat UK

 

Download the full manual here for the 24kW version –

Flexiheat R2C 24kW Boiler Manual

28kW Lpg Combination Boiler

Same dimensions and features as our 24kW gas boilers, but with larger outputs – The 28kw designated model will produce 29.04 kW of max central heating output when running at a 50/30°C flow and return or 27.02 kW at 80/60C. It will modulate down to 3.5 kW of output.

28kw combi boiler; inc vat;vat

28kW Model dimensions

 

This 28 kW unit will produce 13.7 Litres of DHW at Δt 30°C

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R2C 28kW Combination lpg boiler DHW output data

Download the full manual here for the 28kW version –

Flexiheat R2C 28kW Boiler Manual

34kW lpg combination boiler

This 34kW combination boiler lpg fired, is slightly larger than previous units, it will produce 36.19 kW of output when running at a 50/30°C flow and return or 33.35 kW at 80/60C. It will modulate down to 4.1 kW of output.

34kw lpg combi boilers from Flexiheat UK;

34kw lpg combination boilers from Flexiheat UK

This 34kW model will produce 16 Litres of DHW at Δt 30°C

R2C 34kw technical output data

R2C 34kw model technical output data

Download the full manual here for the 34kW lpg boiler version –

Flexiheat R2C 34kW Boiler Manual

Warranty 

The standard warranty is for 2 years, but it goes up to 5 years on the heat exchanger if a heating system filter is fitted to the heating circuit to help maintain the efficiency and reliability of the system, which is now required as per the Part L building regulations requirements and also by BS 7593:2019, the code of practise for the preparation, commissioning, and maintenance of domestic heating and cooling water systems.

Quotes

Our prices for our range of boiler white lpg fuelled units, which can be used on a standard radiator heating system, with normal radiators valves or thermostatic radiator valves or underfloor heating systems, with a manifold valve set up.

Propane LPG boiler

For more information or quotes on the best lpg combi boiler range for sale on the UK market, manufactured in high quality stainless steel, then please give our sales team a call on 01202 822221, or use the web site contact form.

Caravan gas water heater – Caravan gas water heaters

Caravan gas water heater – hot water system

caravan instantaneous gas water heater; lpg water heater for caravan; gas water heater caravan;

A caravan gas water heater provides essential hot water to ensure your caravan or “home from home” has the warm water system to ensure you can shower, at the correct water temperature, and more importantly at the correct hot water flow rate. There’s nothing worse than a poor showering experience as you enjoy your stay in your caravan or holiday home. The other main purpose of caravan water heaters is to provide adequate hot water for dishes or washing up – an area which many of the low-quality water heaters struggle to achieve (more on this further down the page).

Our CE approved gas water heaters for caravans, with the latest innovation provide all the benefits of an instant and unlimited supply of warm water in a cost effective and compact way.

Water heaters

Firstly, we have to define what a caravan water heater is – the device, heats the domestic hot water up to temperature for such uses as showering, bathing or for the sinks, whether it be hand wash sinks or kitchen sinks – this is referred to as sanitary water or domestic hot water – DHW for short.

So gas fired water heaters for caravans, have to cover the water hot demand for your caravan – Here are some figures and numbers that your water heater has to cover –

A standard showerhead flow rate is 7 or 8 Litres a minute – and the standard temperature is 40 Degrees C

Sink taps – 4 litres per minute capacity– standard type

Cloakroom or basin “spray type taps” – 2 litres per minute capacity- again at 40 C temperature

Bath mixer taps – modern bath taps have an approximate operating demand rate of 12 Litres per minute capacity-  at 40 Degree C.

Kitchen sink taps – 4 to 6 litres per minute but at a heated temperature of 50 Degrees C

Because 50 Degrees C is the temperature required to effectively remove grease from cooking utensils, plates, cups etc.

Thus, it is very important that your caravan gas water heaters can achieve this temperature, with a flow rate to fill the washing up sink in a reasonable time.

So the on demand water heaters heating power or capability of your caravan gas water heaters needs to be suitable to the demands required of it. You get back from swimming in the sea or pool, and you want a nice shower experience for example.

Caravan gas hot water heaters

Caravan water heaters come in two main types, electric powered or gas powered

Electric heating element / Electric water heaters

These use electricity to heat the water directly – but come with lots of potential issues that you need to be aware of –

1. The struggle with the capacity to produce warm water instantaneously, as most caravans only have a 1 Phase / 240-Volt electricity power supply – with a maximum draw of 32 Amps – you cannot produce enough thermal energy, from the electric water heater / electric caravan water heater to satisfy the large capacity hot water demands such as a shower adequately – You need 7 Litres a minute for a standard shower.

2. Another downside is that electricity energy prices are also the most expensive, especially when compared to gas or more specifically LPG (propane) that is the fuel of choice for static caravans.

3. There are electric powered water heaters for boats, or a motor home, with an additional heater element that also include a hot air heater – but these only have a 5 Litre capacity, and take approximately 50 minutes to heat this volume of water from 15C to 60C – which is only enough water for a sink, and nowhere near enough for shower let alone for two people to shower after each other. This is a specialist market, and the truma ultrastore water heater / truma heaters compact heater /carver cascade water heater  are the electric water heater units you want for a vehicle panel van conversions or boat installation.

Gas water heater for caravan – Capacity

Gas caravan water heaters make up the largest part of the requirements for caravan water heaters, as they provide many benefits such as the capacity to provide many litres of heated hot water, as well as fast heating of the water system to an accurate water temperature. They are highly efficient, which saves you money and more importantly work correctly. They produce hot air generated by the combustion process, and these flue gases to give them their official name, must be evacuated from the caravan water heater, via a flue system.

The most popular are –

Propane gas water heater for caravan

With LPG being the predominant gas used on caravan and holiday home parks, where static caravans or static holiday homes are located, this has resulted in LPG or Propane gas water heaters being the most popular water heater for this sector.

The LPG caravan water heaters that we offer are of the highest quality , and heat the water in the most efficient manner and work correctly, our most popular unit is the SFK water heater, which is equipped with a caravan water heaters class leading 16mm diameter heat exchanger water ways, which ensures very low pressure drops, guarantees lower risk of clogging, greater thermal efficiency, and greater ease of cleaning of the equipment . – which is especially important in areas with hard water. Just double check the following map of the UK and Northern Ireland.

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Hard water areas of the UK, Northern Ireland and Southern Ireland

Propane Gas (Liquefied Petroleum Gas)

LPG gas or Propane gas as its also known, is the perfect gas to use for caravan water heaters, as the gas is readily available and very common in the UK- other many benefits of the gas are; –

  • LPG gas is easy to transport
  • The gas is clean burning – the burners have a longer life; hence maintenance is lower.
  • An effective and efficient gas with direct firing systems as the heat loss is minimal.
  • LPG is easy to store, in cylinders or a bulk tank – No spillage risk as opposed to oil heating for example.
  • Propane has a low boiling temperature of minus 42ºC, making it perfect fuel for use in lower temperatures and well suited to power a heating boiler or water heater for caravans.
Lpg gas cylinders feeding a caravan; faster checkout; grid sort; basket close; wait; temporarily suspended; customers; stock; boiler; customer creating; stock add; heating; shop;

Propane cylinders with gas regulators feeding a static caravan

They can be hidden away from sight like so (regulators hidden as well as pipes)

 

grid sort; stock add; stock; boiler; safety; wait; two people; gas electric

 

Caravan on demand water heaters – gas fired

The most popular water gas heaters we do for static caravans is our SF14 model, which has a 24kW output, and is available not only as a propane water heater, but also natural gas if so required. This instantaneous domestic hot water heater produces hot water on demand and gives you an instant and unlimited supply of hot water. This makes this water heating system one of the most efficient, with an “A” rated energy efficiency class and results in you saving money on your caravan water heating needs.

These units are an instant water heater or tankless gas water heater equipment.

The dimensional details are –

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SF14 LPG water heater from Flexiheat UK

 

Hydraulic connections – at the bottom of the water heater

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Aesthetically pleasing design

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SF14 Low NOx from Flexiheat UK

Advantages of our caravan water heaters

  • Copper wet chamber heat exchanger that prevents thermal inertia
  • Reduction of initial water over temperature with low flow rates
  • 16mm diameter heat exchanger water ways
  • Room sealed lpg hot water heater – the water heater flue is twin wall – and heater flue kit makes the lpg gas hot water system room sealed.
  • Electrical protection level is IPX4D for this equipment
  • Ease of access for maintenance / servicing the equipment
  • We do a vertical cowl extension, should the caravan the wall ribs prevent you using our standard horizontal cowl extension
  • Cost effective water heating equipment for your caravan
  • Compact equipment in size
  • Water heater white colour

    gas fired caravan water heaters; on demand water heaters; hot water heater; tankless heaters

    Internal picture of our on demand water heater for static caravans – with large 16mm Copper wet chamber heat exchanger that prevents thermal inertia and blockages.

 

  • Possibility of remote shutdown with our internet / Wi-Fi enabled controllers

Caravan Water Heater Performance

Simply said, the volume of hot water generated by any hot water heater is exactly proportional to the temperature rise of the hot water required. As an example, consider the following:

Showering temperature is 40 Degrees C –

Dish / Kitchen Water is 50 Degrees C – to ensure grease is removed from the utensils

Here is some data on the temperature of the mains cold water in the UK, at different times of the year

mains cold water temperature for the UK

Mains cold water inlet temperatures for the UK by region Source – Energy Saving Trust – 2008

So, the required water temperature rise, is known as “Delta T “- this is abbreviated as this sign “ΔT” – And ultimately the lower the temperature rise, the more warm water the device will produce – In the summer when the incoming water is warmer – it will produce more litres, and in the winter, when the incoming water is lower, it will produce less – it’s a simple as that.

Here’s our performance data of our SF14 water heater, at various temperature rises.

flow rates; boiler;

Thus, to achieve 40C warm water in the summer, for the majority of the UK, you need a Delta T of 20C – thus our unit produce 15.82 Litres/min – enough to run a bath or 2 showering heads at the same time.

And more importantly, for people who inhabit a static caravan in the winter months – when the delta T is 30C – then you have 10.82 Litres/min – again more than enough to run a standard showering head (which is 7/8 Litres /min) – So we have you covered when you need warm water the most – in the winter!

Frequently asked questions

What is the best water heater for a static caravan ?

Without a shadow of doubt, it is gas fired water heaters – because the flow rates are higher in gas-fired water heaters than electric ones. Also, gas water heaters are much less expensive to operate than electric water heaters. They are more expensive to purchase than an electric water heater. However, based on energy savings, gas water heaters typically pay for themselves in roughly a year.

Static caravan lpg water heaters ?

Static caravan lpg water heaters are by far the most popular water heater used in static caravans , as lpg is readily available, and cheaper than using electricity to heat your warm water requirements.

Caravan Gas Fired Water Heater

We carry stock, and use a small pallet service to deliver anywhere in UK, Northern Ireland and Southern Ireland.

Should you require any more information or prices on the best caravan gas water heater / lpg water heater for caravan, then give our sales team a call on 01202 822221.A full inc vat invoice is supplied for all items supplied. For our latest news follow us on Facebook or Twitter for our latest special offers.

LPG Combi Boilers for Caravans

LPG Combi Boilers for Caravans

best lpg combi boiler for static caravan;static caravan boilers combi; morco boilers;shop;warranty;stock

Best lpg combi boiler for a static caravan from Flexiheat UK

Propane or LPG combi boilers when installed in static caravans, are considered to be the “ideal boilers” for satisfying the central heating system (radiators or underfloor heating) and the domestic water heating.

They offer a more powerful and more efficient heating system for their size and will run at a lower cost to the static caravan owner or user.

They are in essence a lpg heating system boiler and static caravan water heater in one combined unit – so there’s no need for lpg heating boiler and a lpg water heaters as two separate appliances these days – a compact lpg combi boiler

LPG is a popular alternative to standard mains gas or oil-based heating systems as it’s safe and efficient and it’s easy to get connected today. LPG is an effective way for caravan owners to heat and provide hot water for their static caravan, as it’s clean, safe and smokeless.

liquid petroleum gas or LPG as we know it in the UK, is the most commonly used fuel for static caravan boilers for the UK and Ireland, as lots of caravan parks or sites are off the mains gas grid.

LPG boilers are a great alternative to electric heating systems. They are very cheap to run and easy to install. One type in particular, called a lpg or propane combi boiler, is very popular with caravan owners because its low cost of running and maintenance. Most lpg combination boilers are very compact, and can be installed in any static caravan. They can also be installed in a holiday home,chalets, holiday flats and apartments, so you do not have to live in a caravan to use a lpg combination boiler.

Best LPG Combi Boiler ?

When looking for a new lpg boiler or lpg combi boiler for a static caravan, there are a two main parts to a lpg combi boiler that we need to look at – the central heating side of the boiler for the static caravan and the lpg water heater side of the unit, as well as high efficiency, to ensure your gas bills are as low as possible for your static caravan.

You’re also looking for a compact lpg combi boiler, as static caravans aren’t always necessarily the roomiest of places, a lpg combi boiler that is small, yet powerful enough to do the water heater demands as well as the central heating system is a benefit.

static caravan boiler; static caravan boiler combi; refill;shop

Dimensions of our combination caravan boiler – R2C 24kW from Flexiheat UK

 

 

The primary compact lpg combi boiler for static caravans is a condensing boiler, as these use the lpg / propane gas to the maximum efficiency, both for the heating and water heater side of the boiler.

Our most popular static caravan boiler is the 24kW model – which will supply heat up to 23.5 kW of heat output / power and will supply your caravan with domestic hot water at a flow rate of 11.5 litres / min at a temperature rise of 30 Degrees C – this is enough to run a bath in the winter period.

 

We always quote water flow rates at a temperature rise of 30 Degrees – these are winter time performance figures – because we want you to have a hot bath or shower (an average shower uses 7 or 8 litres / minute) when you need it the most.

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Heat exchanger of our caravan combination boiler from Flexiheat UK

 

 

The 12mm diameter internal s/s pipe where domestic hot water is produced, is inside the patented main heat exchanger (28mm diameter). Its total length is 8 meters and this ensures a large capacity for hot water production. The hot water flow is always available and always in condensing operation, resulting in lower energy costs and bills.

This class leading technology, with the large diameter, also reduces the chance of scale, something that older technology boiler that use a plate heat exchanger can suffer from. This is incredibly important in hard water areas- as our units don’t suffer from this.

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LPG static caravan combi boiler technical detail

compact lpg combi boiler; caravan boiler;

R2C 24kW Compact lpg combi boiler – Technical data from Flexiheat UK

 

Download the manual here

R2C 24kW Propane or Natural Gas Combination Boiler for static caravans – Manual

External mounted propane combination option

We also supply an external combi boiler that is weatherproof, this external lpg combi boiler designated the R2K 24 – is a 24kW condensing model, is a little heavier at 37 KG’s – than our internal boiler – thus depending on the weight you caravan wall can take, you can either mount it directly or make a frame from the chassis of the static caravan to support the weight.

external lpg combination boiler; water heater; morco lpg water heaters;

External LPG combination boiler for Static caravans from Flexiheat UK

The benefit of having an external compact lpg boiler, that is fully weatherproofed, is that you eliminate (the gladly rare but often fatal) carbon monoxide poisoning risk.

Our boilers can be converted from an LPG (propane) to a natural gas boiler easily, should the need ever arise. We just supply plumbers with a simple conversion kit, and it’s a 5-minute job to do.

So, if you want supplied a high-quality replacement for your vaillant or morco boilers- call us

LPG Boiler Controls for Static Caravan

You can control your heating system via the inbuilt control panel or even remotely via an app on your phone, tablet or computer (internet access required), so you can control your boiler from anywhere.

Cloud warm controller for R2C 24kW; stock; shop; spares; range; gas; caravan;

 

lpg boilers

 

Our standard lpg combi boiler, which is internally fitted within the caravan, requires a flue kit fitted. Our most common flue kit is a co-axial room sealed either horizontal or vertical, which means that all the air for the combustion process is taken from the exterior of the caravan (no windows need to be left open etc)

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Horizontal flue kit for the R2C caravan combination boiler from Flexiheat UK

or Vertical

vertical flue kit for static caravan boiler; water heaters; stock; morco boilers; lpg boilers; compact lpg combi boiler; shop; older paloma; saunier duval; stock

lpg water heaters

If you require just a water heater only, then you just require a lpg water heater, and we do a great range that are ideal high efficiency replacements for older Paloma, Vaillant,Worcester Bosch,Saunier Duval, Rinnai or Morco LPG water heaters.

But a few points to be aware here with regards to lpg water heaters –

There are lots of lpg water heaters on the UK market, that we’ll shall say are of “questionable quality “and also, we question some of the “performance claims”

Our top tips for selecting an lpg water heaters are –

 

1.Select a good quality manufacture for your lpg water heaters

Preferably from Europe, as by law spare parts have to be available for at least 10 years. Spares (including flue components spares) that aren’t available anymore, means a new water heater in most cases, with the additional expense of installing a new water heater.

2.Ask what country the LPG water heater is manufactured in?

Some are buying product in from the far east, and putting a badge on them – most of these are of very questionable quality to say the least – let alone the spares back up / availability.

3.Make sure your lpg water heaters, have suitable ” ErP” labels supplied

These are minimum requirements these days, to be on the UK and European market

The market for LPG water heaters really is really awash with some poor-quality water heaters, and the old adage of ” you get what you pay for ” or “buy cheap buy twice” really applies to the lpg water heaters market in the UK.

If you’re looking to replace the older paloma range , saunier duval,bosch, vaillant,rinnai or worcester models, with a water heater range with a great warranty ,for your static caravan, chalets ,holiday home or even a house , then you need to look at this webpage that is dedicated to our dedicated caravan gas water heater  webpage or lpg water heaters  for our full range of water heaters.

Boiler Installation

Any LPG qualified gas fitters or plumbers can fit our lpg combi boiler, they are an easy installation, just connect up to the static caravans heating system and also to the static caravan water heater system.

As we supply plumbers and gas fitters across the country, it is important to use a relevant gas safe engineer, who is qualified to work on and install a lpg combi boiler in a caravan. Use the following website to check – Gas Safe Register

Delivery / Collect Options

We normally have the units available on a 2/3 working day delivery service or a next working day delivery if so required (at extra charge). Or alternatively you can collect from our site. Just let our sales team know your requirements.

Best static caravan boilers / static caravan gas boilers

For more information on the best lpg combi boiler range for a static caravan, residential park homes, chalets or holiday homes or apartments for sale on the UK market, manufactured in high quality stainless steel, then please give our sales team a call on 01202 822221, or use the web site contact form.

 

50kw Combi Boiler – Gas combi boilers

50kw Combination Boiler

A 50kw combi boiler or 50 kw gas combi boiler- which is a combination boiler doing both heating and domestic hot water heating, powered by either natural gas or LPG gas from Flexiheat UK

50kW Combi boiler or Combination boiler – gas fired – from Flexiheat UK

Our Flexiheat 50kW combi boiler is a well-designed condensing combination boiler with 97% efficiency making this an “A” rated boiler for heating and hot water. Due to this efficiency, it can reduce fuel bills and reduce your carbon footprint as it can generate enough heat to meet the demand of your home using less fuel than an older inefficient boiler. The boilers installation is easy, and we can supply this high performance gas combi in either natural gas (mains gas) or LPG (Propane) gas and its ideally suited to larger homes.

Gas combi boilers are one-of-a-kind, compact, and cost-effective solution that are ideal for houses with limited space. They combine a water heater and a central heating boiler into a single device, eliminating the need for additional water cylinders or tanks in your home.

Boilers account for approximately 60% of a household’s yearly energy costs, they have an enormous impact on fuel bills. With more seasoned older gas boilers, a significant sum of heat that may be utilized to produce warming and hot water is wasted, making them progressively costly to run.

Our 50KW combi boiler is more than 97% efficient, so 97p of each £1 you spend on gas for your combi boiler is utilized. When using an Opentherm internet-connected Smart controller, you can control our ERP “A” rated high performance gas boiler, on the go from your mobile, or tablet – now becoming a must for people with busy lives and even commercial heating applications.

ERP A-rated for both heating and hot water, this efficient, reliable combi boiler provides effortless comfort at a reduced running cost. All while you sit comfortably in complete peace of mind, knowing that you have a highly efficient 50kw gas combi boiler, that is also one of the quietest boilers in its class at 52 decibels noise level installed (for comparison a refrigerator is around 50 Decibels noise level).

Best features of our 50kW condensing boiler / combination boiler are –

 

  • Increased power- compared to the competition – we actual make a 50kW combi boiler – that will do 53.85 kW max of heating power based on an 50C/30C flow and return system, or 49.19kW at 80C/60C.Can be used on a underfloor or radiators heating system.

 

  • Fantastic new design – this 50kW gas combi boiler benefits from aesthetically pleasing looks. With its modern design (combi boiler white colour), and quieter operation with reduced noise level, making it one of the quietest boilers on the market.

 

  • Increased burner modulation ratio of 1:10, which prevents on/off cycling for a lengthy product life and reduced noise level to the user.

 

  • It’s inbuilt intuitive controller, which benefits from an intuitive menu structure for all the information required for control, commissioning, and fault finding if so required of the heating system, which means no need to search through manuals for fault codes. Resulting in rapid diagnosis of any issues. Not that you’ll use the fault finding much with our quality range of efficient 50kw gas fired combination boilers

 

  • Servicing – With plenty of room within the appliance casing – this range of 50kW combi boilers is installers dream to work on. Also a benefit for rapid diagnosis fault finding.

 

  • Installation of the boiler – which must be done by gas safe qualified installers or company – can be in any location, as we do various flue options, such as a room sealed range (see details below) also being one of the quietest boilers, you’ll have complete peace where ever you locate the boiler.

 

  • Can be operated on a system pressure of 0.3 to 2.1 Bar for the heating side and 0.5 to 6 Bar system pressure for the Domestic Hot Water side of the appliance

 

  • This range of combi boiler is suitable for natural gas or LPG (must be specified at date of customers order) – sit comfortably knowing if you change your gas type the boiler is easily converted over.

 

  • DHW flow rate at a 35 Degrees C temperature rise is 20.30 litres/min or at a 40 Degrees C rise then its 17.5 litres/min max flow rate.The temperature is easily changed with our intuitive menu structure in the inbuilt control panel.

 

Heating system side of the boiler

Central heating output – Based on flow and return temperatures of 80/60 and the fact that current new build homes have radiators that on an average of 1.5kw output the 50kw combi boiler can produce 53.85kw of output power which is enough to heat up to 35 radiators on the system, which is commercial heating figures (Please note: If retrofitting, the number of radiators cannot exceed the out power of the boiler at 53.85kw in total)

Some of our competitors claim a 50 kW combi – but in reality, the heating side of the boiler is only 35 kW of output

There is not may companies producing a 50kw combination boiler, some people may regard a boiler produced by the Worcester Bosch company – namely the combi boilers worcester greenstar 8000 50kw combi boiler range as a direct competitor to our boiler, but in reality, this boiler and all the information we can find, will only produce –

Central heating output (kW) – 33.8 kW at 80/60C or at 50/30C condensing mode – 35.7 kW

While our gas boiler will produce 49.19 kW of heating power at 80/60C or at 50/30C condensing mode – 53.85 kW

Thus, can you really call the Worcester greenstar 8000 a 50 kW combi ?? you decide, but it seems a bit short to us?

Domestic hot water performance (DHW) –

The Worcester greenstar 8000 is 48.9 kW rated on the dhw side, the dhw output is –

Flow at the DHW tap (35°C temperature rise) – 20.3 l/min

Flow at the DHW tap (40°C temperature rise) – 18 l/min

With a plus or minus of 15%  quoted ?? umm 

Whilst our boiler will produce the following outputs for domestic hot water

Flow rate at the DHW tap (35°C temperature rise) – 20  l/min

Flow rate at the DHW tap (40°C temperature rise) – 17.5 l/min

There’s no plus or minus 15% for our data – we will produce those figures quoted above

Domestic hot water performance of the combi

Due to its excellent domestic hot water flow rate, with a temperature rise of 30 degrees C @ 23.40 ltrs/min of hot water flow or with a temperature rise of 35 degrees C @ 20 ltrs/min, the 50kW combi boiler is ideal for a two-bathroom house.

Hot water cylinder

As no domestic hot water cylinder is used with a combination boiler, you are lowering your carbon footprint and energy fuel consumption for your domestic hot water usage, gas is only consumed in this ERP A rated efficient combi boiler when hot water is required – it’s one of the key features – your only heating hot water when you require it – which results in lower energy bills / energy cost.

Should you cold mains not have enough flow rate to adequately provide for your hot water needs then a system boiler, which uses a separate cylinder for storing water for larger volume applications or heat only gas boiler (also are also called a conventional, regular or traditional boiler), then please see our webpage here – 50kW Boiler

Heat exchanger style / construction

This gas boiler is equipped with a stainless-steel exchanger with a large Ø 28mm monotube coils, which not only benefits from very low pressure drops, but guarantees lower risk of clogging, with greater thermal efficiency, and greater ease of cleaning. We guaranteed or warranty the heating water heat exchanger for 10 years, when a good quality magnetic dirt and air separator is fitted to the heating system, and the boiler is serviced annually.

Technical data of our combi boiler – 50kW

 

50kw combi – central heating output / hydronic heating – Erp efficiency “A” – energy savings trust approved

 

50kw combination boiler central heating and domestic hot water technical data

Energy efficient domestic hot water “A rated” erp efficiency – dhw flow rate at various temperature rises 

 

combi boiler 50kw domestic hot water flow rate at various temperature rises

mains gas and propane gas and electrical requirements for the combination boiler

inc vat; increased power; intuitive menu structure; customers; fantastic new design;company

Download the 50kW Combi Boiler Manual Flexiheat UK

Boiler Flue Options / Spares

We do various flue options / accessories, the most common is a co-axial, which takes the combustion air from outside, and the combustion gases from the device to the outside – making these combi units room sealed when used.

The most common flue kit is our horizontal co-axial kit – both of these can be used up to 10 metres in length

Horizontal flue kit from flexiheat UK;worcester greenstar 8000;ex vat;worcester bosch;ex vat;worcester bosch;ex vat;inc vat;quietest boilers;inc vat;ex vat

Horizontal kit from Flexiheat UK

 

Or the vertical option

Vertical flue kit from Flexiheat UK;ex vat;worcester bosch;worcester greenstar 8000;ex vat;worcester bosch;ex vat;worcester bosch

Vertical kit from Flexiheat UK

 

Both of these accessories can be used up to 10 metres in length, losing 0.8 metres off the length for every 90° elbow used, and 0.5 metres for every 45° elbow used from the overall distance.

Or by using a split system, we can achieve routes of up to 60 metres

boiler Split flue pipe system;

Split pipe system from Flexiheat UK

Boiler controls

With an easy-to-use display with an intuitive menu structure and greater connectivity with any Opentherm compatible controller, our 50kw combi or combination boiler is made to suit your lifestyle, as well as your home.

One of the new features of OpenTherm – (which is a standard communication system that connects natural gas, lpg gas, oil or even electric boilers with room thermostats). This means that your combi boiler can be used with any OpenTherm compatible thermostats or controllers – the best-known brand on the UK market to date is between Nest or Hive, but we also provide a solution from stock, which has extended range, and key features such as the ability to control your boiler from a mobile phone, pad or your computer.

This means if your away on from home, you can have controllers that will activate your boiler based on your postcode location in relation to your property – so it’s nice and warm when you get in or should you be travelling, you can adjust the boiler start time in relation to when your due home on your phone or other device, should you be delayed for any reason you simply adjust the time on your device.

Class 5 modulating controls, can provide an increase of 3% system efficiency, as they have a direct impact on the efficiency of the modulating combi boiler, by modulating the flow temperature in line with the internal temperature of the property.

Easy Remote

Advanced class 5 remote control (full colour display), which performs the dual function of a thermostat and remote control of the boiler. This controller must be wired from its location to the gas boiler.

Easy remote controller from Flexiheat UK; Class 5 modulating boiler controller range;bosch easycontrol;stock;website;inc vat;delivery;stock;England;delivery;intelligent filling system;worcester greenstar 8000:stock;inc vat

Easy remote controller heating – Wired – from Flexiheat UK

  • Daily / weekly heating and DHW programming;
  • Heating system and DHW temperature setting;
  • Reset by remote control in the presence of resettable fault codes – rapid diagnosis
  • Thermoregulation management for reduced running cost of the heating
  • Appliance parameter programming (technician level)

 

Cloud Warm WIFI (Wireless) Controller

A free-standing class 5 advanced remote control (full colour display) thanks to the free downloadable app which performs the dual function of chrono thermostat and remote control of the device from a mobile phone or tablet.

Cloud Warm Wired controller from Flexiheat UK; stock;delivery;stock;website;inc vat;stock;delivery;stock;worcester greenstar 8000;ex vat

Cloud Warm Wired controller from Flexiheat UK

 

  • Daily / weekly heating and DHW programming;
  • Cloud warm application available for free on the Apple Store and Google Play; No annual charges to pay
  • Heating and DHW temperature setting;
  • Push notifications to a mobile device in the presence of any abnormality or fault;
  • Reset from a mobile device in the presence of resettable fault codes;
  • Thermoregulation management for reduced running cost.

Cloud Warm WIFI (Wired)

As above functions, but this unit must be wired back to the 50kw gas boiler

Stock;delivery;ex vat;worcester bosch; inc vat;worcester bosch;ex vat;inc vat; ex vat;inc vat;ex vat; ex vat;inc vat;ex vat;inc vat;ex vat;inc vat

Cloud Warm Wireless Opentherm controller from Flexiheat UK

 

 

Brand and Quality manufacturing

With its modern design, with A rated ErP efficiency for heating and DHW (energy savings trust approved) this combination boiler with design led product aesthetics is well suited to contemporary homes.

Our 50kw combi boiler is manufactured in accordance with ISO 9001 and ISO 1400 certified management systems and testing techniques. Should you require more information, prices or delivery times, then please contact our sales teams for the best 50kw gas combi boiler on the UK and Irish market. You can call our office on 01202 822221 or send an email via our contact form.

LPG Water Heaters

LPG Water Heaters

Lpg Water heaters; lpg instant water heaters; lpg tankless water heaters; propane gas domestic hot water heaters

LPG (Propane Gas) Water Heaters from Flexiheat UK

LPG gas water heaters– What are they, and what are the benefits? An LPG (Liquefied Petroleum Gas) water heater is a gas fired water heater that heats domestic hot water instantaneously to multiple points around your home or building. These lpg water heaters allow you to connect the water heater to a number of hot water outlets throughout your property or home or even a commercial building.

On demand or continuous flow propane gas water heater?

This type of lpg water heater, provides a simple and proven solution for providing instantaneous domestic hot water on demand, without the need of an indirect cylinder and a propane gas boiler. This liquefied petroleum (LPG for short) gas fired water heaters, which are available in propane (LPG) or as a natural gas water heater are simple, with high energy efficiency and clean combustion. These units when powered by propane are often called lpg tankless water heaters provide many benefits being far more energy efficient that storage units.

They are also an energy saving solution to more traditional domestic hot water storage systems, as they only heat the water when its required. These facts have made the lpg flow water heaters not only the customers propane water heater of choice, with great user comfort, but also the plumbers / heating installers choice as well.

Propane Water Heater? What are the benefits

  • High performance mains water pressure to all warm water outlets
  • ErP Class “A” energy efficiency for your domestic hot water requirements – Save money and save the environment.
  • LPG tankless heaters -no cylinder required -Tankless lpg water heater systems are far more efficient than storage cylinders and boilers.
  • Low NOx or condensing LPG fired water heater – less polluting and better for the environment
  • High hot water flow rates of up to 29 litres per minute with a water temperature rise of 33 Degrees C
  • We can supply Propane gas or Natural gas fired versions.
  • Internal ( indoor ) and externally ( outdoor ) mounted products are availableExternal gas water heater; outside gas water heater;external lpg water heater

External or outside gas water heater from Flexiheat UK

  • Modular – Flexibility of usage – multiple heaters can be used to supply greater hot water demands, in cascade.
  • These propane water heaters are suitable for domestic and commercial applications such as domestic properties, cafes, pubs, restaurants, offices or shops
  • These propane gas heaters are simple to install and maintain in any small or limited space location.

LPG DOMESTIC HOT WATER HEATERS

Our range of instantaneous tankless water heaters, are available in either natural gas or LPG Gas. LPG (Liquefied Petroleum Gas) is a gas that exists in a liquefied form, and is a very popular fuel for heating homes, and also in commercial applications such as caravan parks, leisure parks and any other categories where mains gas supply is not available.

The most common LPG (Liquefied Petroleum Gas) gas used for water heaters is propane, as this gas is ideal for outdoor use, as it is not affected by cold weather conditions that we can have in the U.K and Northern Ireland.

This gas has a classification of “G31 Propane”, and can either be stored in larger tanks or mobile cylinders.

Should you wish to run your flow water heaters on (LPG) propane gas, we would recommend a bulk gas tank, however you can run these units of gas cylinders for example – a 47kg propane cylinder maximum continuous off take rate is per hour 32.94 KW, for heaters rated above this input, your LPG hot water heating system will require more than one and thus automatic changeovers valves sets are used or a bulk lpg tank.

For the above reasons, our LPG gas water heaters are very popular in camping and caravan sites, for shower blocks or restaurants and with sports / leisure facilities, such as football and rugby clubs, again for showering facilities, as these water heaters can be used in multiples or in a cascade configuration to give its official name.

CONDENSING OR NON-CONDENSING LPG GAS WATER HEATERS?

For a gas water heater to condense, the water coming into the contact with the heat exchanger, must be under the dew point of 54°C or lower for propane gas– the maximum incoming cold water temperature, even in the height of summer is 20 Degrees C for the UK, meaning you’re going to have the water heater operating in the condensing mode all year round!

Thus, this gas fired condensing water heater process will deliver up to 105% net thermal efficiency, resulting in significant energy savings when compared to conventional non-condensing gas fired water heaters.

Ultimately, condensing propane water heaters just make perfect sense. They are slightly more expensive than non-condensing versions, but that price is warranted with lower running costs and lower impact on the environment.

We do however, produce one unit, which is a non-condensing water heater for the cost conscious, our “SF Low NOx Evolution” model, which is available with a power output of 24 kW. This has been a very popular model for the domestic / caravan water heater market, although most consumers can now see the benefit of the condensing hot water heaters, with the market moving towards this type.

Our range of instantaneous tankless water heaters, are available in either natural gas or LPG Gas. LPG (Liquefied Petroleum Gas) is a gas that exists in a liquefied form, and is a very popular fuel for heating homes, and also in commercial applications such as caravan parks, leisure parks and any other categories where mains gas is not available. We have many customers who just want to supply just one bathroom or multiple bathrooms – which we can achieve.

The most common LPG (Liquefied Petroleum Gas) gas used for water heaters is propane, as this gas is ideal for outdoor use, as it is not affected by cold weather conditions that we can have in the U.K and Northern Ireland.

This gas has a classification of “G31 Propane”, and can either be stored in larger tanks or mobile cylinders.

Should you wish to run your flow water heaters on (LPG) propane gas, we would recommend a bulk gas tank, however you can run these units of gas cylinders for example – a 47kg propane cylinder maximum continuous off take rate is per hour 32.94 KW, for heaters rated above this input, your LPG hot water heating system will require more than one and thus automatic changeovers valves sets are used.

For the above reasons, our LPG gas water heaters are very popular in camping and caravan sites, for shower blocks or restaurants and with sports / leisure facilities, such as football and rugby clubs, again for showering facilities, as these water heaters can be used in multiples or in a cascade configuration to give its official name.

FACTORS TO CONSIDER WHEN SELECTING / SIZING YOUR PROPANE WATER HEATER

There are three important factors to consider when selecting the correct water heater for your requirements.

The standard water temperature for bathing or washing is 40 Degrees C

In essence, it’s just a simple matter of the law of physics – the larger / more powerful the lpg water heater, the greater the flow rate of hot water. This is especially true, when in the winter months, as the mains cold water entering temperatures drops, and this is an important factor to consider in UK.

Thus, the amount of warm water the lpg gas water heater will produce and directly related with the temperature rise that the water heater is required to achieve (more on this in point 2). You basically need to cover the flow rates of your hot water appliances, with your usage patterns.

Flow rates

Kitchen sink taps – 4 to 6 litres per minute

Sink taps – 4 litres per minute – standard type

Basin / cloakroom “spray taps” – 2 litres per minute –

A standard shower head has a hot water demand of 7 or 8 litres a minute,

Bath mixer taps – modern bath taps have an approximate demand rate of 12 Litres per minute

So be adding all of your potential hot water outlets, then applying a diversity factor (a factor that not all of the hot water outlets will be used at the same time) you can calculate your hot water demand

Water Heating – Temperature rise

The temperature rise that the gas multipoint water heater has to achieve. This is also known as T ° variation or delta T which when abbreviated looks like this “ΔT”. Quite simply the amount of hot water produced by any hot water heater, is directly affected by the temperature rise of the hot water required. An example of this is –

If you set the hot water temperature to 35 ° C and the cold water entering the multipoint gas water heater is 15 ° C, then you have a variation of temperature or delta T of 20 ° C (35 ° Degrees C minus 15 ° Degrees C). Alternatively, if the appliance was set to a desired hot water temperature of 40 ° C, then the temperature rise or delta T would be 25 ° C (40 °- 15°) and thus the flow rate achievable changes

Mains cold water temperature for the UK

The incoming mains cold water temperature for the UK, for various regions is as follows –

We have two sources of information here –

mains cold water temperature for the UK

Mains cold water inlet temperatures for the UK by region Source – Energy Saving Trust – 2008

 

Or the blue line on the following chart

mains cold water temperature UK over a 12 month period

Please see the blue line for the average mains cold water temperature for the UK over a 12 month period

 

The above chart shows the coldest water temperature in January at around 5 Degrees C – Source TUV

Please use whatever data your comfortable with

LPG Fired Water Heater Range

We do both a domestic LPG water heater and a commercial heater range, both of which have great temperature control, energy efficiency and capacity.

Unlike a lot of our competitors, we are more than proud to publish our performance data at many different temperature increases, as there may be applications – such as commercial kitchens or other applications which require the water to be produced at higher temperatures, such as industrial hot water systems.

The first and smallest unit is our SF14 model which is a 24kW non condensing low NOx model – this unit benefits from-

  • 16mm diameter heat exchanger water ways – the largest we know of on the market (except our condensing lpg units – which are an incredible 28mm in diameter) this size ensures very low pressure drops, guarantees lower risk of clogging, greater thermal efficiency, and greater ease of cleaning. – especially important in areas with hard water

    lpg tankless water heaters; lpg instant water heaters; liquefied petroleum gas hot water heaters

    SF14 – LGP tankless water heaters from Flexiheat UK – Internal picture of the hot water heater

  • Wet chamber copper heat exchanger that prevents thermal inertia
  • Reduction of initial water over temperature with low flow rates
  • Very low NOx emissions, maximum 50 mg / kWh – better for the environment.

DHW performance for the SF14 unit is –

We class the Red figure – as worst case winter performance , and the Yellow figure as the height of summer performance

 

SF14 low nox lpg water heater hot water performance by Flexiheat UK

SF14 Low NOx water heater hot water performance by Flexiheat UK

This model is a perfect solution to the hot water requirements for domestic properties and also some light commercial applications.

 

The next range is our condensing lpg instantaneous domestic hot water heaters , which are the most efficient that you can find on the market- there are 3 models in this range, and two different options. All unit will require a condensate drain

SFC range – for direct feed to the water outlets (the most common application)

SFK (for dhw recirculation systems) with an in inbuilt pump, the larger 50 model is only available with the inbuilt pump, its up to you whether you use it or not

The performance is the same for the direct feed and pumped versions

28kW Model performance data

 

lpg gas water heater;lpg tankless water heater uk;lpg instant water heater

SFC and SFK28 LPG Domestic hot water performance by Flexiheat UK

 

34kW Model performance data

 

propane water heater uk; propane water heaters; propane gas water heaters; lpg tankless water heater

SFC and SFK34 LPG Domestic hot water performance by Flexiheat UK

50kW Model performance data

 

propane water heater uk; propane water heaters; propane gas water heaters; lpg tankless water heater

SKF50 LPG Domestic hot water performance Flexiheat UK

Flue Options

We do various flue options, the most common is a co-axial , which takes the combustion air from outside , and flue gas from the device to the outside – making these units room sealed

The most common flue kit is our horizontal co-axial flue kit

Horizontal Flue Kit - Co-axial room sealed by Flexiheat UK;checkout;mail;ratings;vat;sign;vat;users;checkout

Horizontal Flue Kit – Co-axial room sealed by Flexiheat UK

Or the vertical flue kit

vertical flue kit;users;vat;add;ratings;ratings;vat;ratings;add;ratings;users;add

Vertical Co-axial flue kit from Flexiheat UK

 

Using a split flue system, we can achieve flue routes of up to 60 metres

LPG tankless water heater UK

We carry stock, and use a small pallet service to deliver anywhere in UK and Northern Ireland.

For more information, advice or to find /learn more on our brand of products, which are lpg gas water heaters / lpg gas water heaters with indoor or outdoor versions at great prices and quality, or for delivery times, to place an order, get prices then email us at sales@flexiheatuk.com or give our sales team a call on 01202 822221.A full VAT invoice is supplied for all items supplied.

How to size a commercial water heater

How to size a commercial water heater

How to size a commercial water heater by Flexiheat UK; industrial water heating sizing;

How to size a commercial water heater by Flexiheat UK

A commercial water heater is required for supplying warm or hot potable water for showers, bathrooms, kitchens, restaurant sinks, washing machines etc and other purposes in a commercial or industrial building, such as schools, hotels, gyms or hospitals. A commercial water heater uses electrical elements or a burner to heat cold water up to the desired hot water temperature which is used when a demand is placed on water heater. Water heaters may use a tank to store the heated water for when it is required. Sizing a commercial water heater is relatively easy process and not a ” dark art ” as some people may think.

They are also used in many industrial water heating applications, when hot water is required for a production process, such as commercial laundries or other uses, as part of manufacturing a product or service.

If you size or select a commercial water heater with more than the capacity required, you’ll end up with higher capital cost and also higher fuel bills than required, on the other hand If you undersize a commercial water heater, then you run the risk of running out of potable hot water, and upsetting your customers in the case of a hotel for example or your production process failing in the event of a hot water process application. Thus, we have written this “How to size a commercial water heater” guide to assist in the correct selection for your water heater requirements.

Commercial water heater definition

A water heater can be defined as a closed tank used to supply potable hot water, which is either heated by electricity, gas (Natural gas or LPG), or any other source, such as solar. The water heater is intended to be supplied with potable water either from a potable water supply, such as directly from the water mains system (these are referred to as unvented hot water system) or via feed tanks when used in an open vent hot water system.

The three vital elements to bear in mind when sizing a water heater for commercial or industrial applications

 

Water storage tank capacity: The tank or vessel capacity for storing the hot water required. The tank allows a large volume of water to be drawn at flow rates that can exceed the recovery capacity of the water heater- which is useful for peak hot water demands.

The recovery rate: The amount of water in litres per hour, raised at a given water temperature rise and kW input. Also often quoted is the one hour draw capacity of the water heater, which is the maximum hot water production for one hour, normally required at the peak period of the day when the heaviest requirement of hot water will occur.

The power or energy input of the water heater – The amount energy required, normally measured in Kilowatts consumed by the water heater, which is provided by your preferred fuel, either electric, gas or oil. One kW of energy is 3,412 Btu’s, if you use the old imperial system.

These three factors are used together to select the correct water heater size and power rating.

The best method for selecting a commercial or industrial water heater is on the basis of hot water usage. The selection is a combination of these factors of tank size, recovery rate and heat input.

What size water heater do I need calculation for commercial water heating applications

Following is the European standard for hot water demands to DIN 4708, that is commonly used when sizing your commercial water heater or industrial water heater- whichever you may classify your water heater as.

 

Commercial Building TypeDemand factorBath tubShowerBidetPrivate wash basinPublic wash basinKitchen sinkSlop sinkBar sink
Hotel & Hostels / B&B’s0.550501010158050100
Hospital0.760701010158050
University0.82205258040
Restaurant1525140100100
Sport centre / Gym’s12205158040100
School (Day type not boarding)0.81805208040
Factory11205208050
Commercial Offices15104040

Calculation example for a commercial water heater hot water demand

A Hotel with 100 rooms = Litres of hot water / Hour at 60 °C

  • 100 Bath tub / showers = 5,000
  • 25 Bidets = 250
  • 100 Private wash basins = 1,000
  • 20 Public wash basins = 375
  • 5 Bar sinks = 500
  • 8 Kitchen sinks = 640
  • 5 Slop sinks = 250

This gives us a total hot water demand of 8,015  x the demand factor for a hotel water heating system sizing of 0.5 = 4,007.5 litres per hour continuous at 60 °C

With a commercial hot water requirement / application like this, due to the volume of water required, the only practical solution is a commercial storage water heater, we do a full range of commercial gas water heaters, that we can match to various storage volumes of up to 5,000 litres in a single storage tank ( more when used in series)  and a power input of 300kW. They are also condensing too, thus you’ll have the maximum efficiency for your hot water commercial system.

We also supply commercial water heaters powered by an oil burner, and this range of oil fired water heaters is fuelled by gas oil which is the preferred oil used in commercial and industrial water heating applications.

Or if you require an indirect commercial cylinder, with great heat recovery times, then you need to look at our tank in tank hot water cylinder range or our commercial hot water cylinders

As well as electric powered which we speak in more depth below in this webpage

Hot water demands for apartment blocks with a communal / centralized hot water system

A standard apartment or flat according to DIN 4708 is defined as consisting of 4 rooms, with 3 /4 persons living there, a 150-litre bath (with a fill time of ten minutes) with one wash basin and one kitchen sink.

It also specifies, within the standard, that the hot water storage capacity and the performance of the heat exchanger in terms of efficiency are both significant factors in determining the number of apartments a water heater or heaters can serve. A general guide is as follows  –

Number of apartmentscontinuous  requirement (litres per hour)
Domestic Hot Water Temperature60 °C45 °C
5030004300
10052007500
150720010400
200910013200
2501070015500
3001200017400

 

Commercial electric water heater sizing

You size a commercial electric water heater, on the exact same principles as a gas or oil powered version, just the fact that you require electricity as the fuel source or power for the water heater. So use the above data to establish your hot water requirement, then look at our webpage commercial electric water heaters, for the available sizes and power outputs than we can supply. Just make sure you have the Amps available to power the unit.

Commercial tankless water heater sizing

Sizing a commercial tankless water heater is a different case, as a commercial tankless water heater heats up water on demand rather than storing warm water in a storage tank for later use. This means they are generally more efficient as they only ever heat as much water as you need and are smaller in size than storage water heaters.

But they have a down side as heating water on demand requires using a larger burner in the case of a gas or oil-fired commercial water heater or electrical heating elements than a commercial storage water heater would use, which means that the energy demand while heating the water can be very high. So, you have to ensure you have the power available to satisfy this requirement.

The most common commercial tankless water heater is gas powered, as gas ( either natural gas or LPG gas ) is great at producing a lot of energy via a relatively small supply pipe.

You size commercial tankless water heaters via the number of hot water outlets they have to satisfy, and to what water temperature, we go more into this on this dedicated webpage – gas multipoint water heaters, that are used in commercial tankless hot water systems.

 

Industrial water heater sizing / calculation

Often industrial water heaters, are sized in a slightly different method, as normally, there are different water temperature rises, specifically required for the process in question
For industrial water heating processes, there are normally 3 elements to sizing your water heater.

These are –

1. The volume of hot water that you require – How many litres of hot / warm water do you require?
2. The temperature rise that you want that water to go through e.g., from the incoming water temperature of 10 degrees C to 70 degrees C etc
3. Lastly your time requirements – how quickly do you want that water to heat up in, or how many litres you require of water per hour your process requires.

When you have established these factors, then you can use the following calculation to establish the kw rating required for you water heater
To heat a specific volume of water by a given temperature rise in one hour.

Volume of water in litres x 4.2 x the temperature rise in degrees centigrade divided by 3600

(just for note – 4 being a factor and 3600 being a given constant)

Thus, for a 1,000 litre water heater, the calculation would be as follows –

1000 litres of water, to be heated from say 10°C to 70°C, giving a temperature rise of 60 °C would result in-

1,000 x 4.2 x 60 / 3600 = 70 kW per hour

This means that the 1000 litres of water would be heated in one hour by 70 kW of applied heat, for the temperature rise of 60°C, whether its by gas, oil or electric

We can use this result to conclude other factors – e.g., to heat the same water volume of 1,000 litres in half the time (i.e., 30 minutes) we would need twice the heating power i.e. 140 kW, as 70 x 2 = 140  kW.

Should the process require a 2-hour period recovery period for the industrial water heater, then we can lower the power input to 35 kW
When sizing an industrial water heater and for a commercial water heater, these are the actual power input figures into the water heater, so you need to ensure that the heater has a nett input of this figure, but its also prudent to add a small percentage for standing heat losses, if you are using a storage water heater.

Alternatively, if you have a specific water temperature rise, and you know the kW input rating of the unit, then you can calculate the water flow rate produced, then use the flowing formula –

m (kg/s) = P (kW) / the specific heat of water (Kj / Kg ºC) X ΔT of the water in Degrees C

Whereby –
m = mass flow rate (kg/s) this is litres per second as one litre of water weighs one kilogram
P= Power in kW
Specific heat of water = 4.187 Kj/Kg ºC
ΔT = temperature increase in C

An example
A water heater, with thermal power input of 70 kW, with a temperature rise of 60 degrees C then it would be –
m = (70kW) / ((4.187 kJ/kg ºC) (60ºC))
thus – 70 / 4.187 x 60
70/251.22 = 0.2786 kg/s or 0.2786 Litres a second – times this by 60 seconds to get per minute then by 60 minutes to get the volume per hour – thus 1,003 Litres per hour for a 60 Degree C water temperature rise.

Hopefully this sizing / calculation guide for commercial and industrial water heating applications has provided the information and formulas to help you size the correct water heater for your application. Should you require any more information on our commercial and industrial water heaters, please don’t hesitate to contact us at Flexiheat UK