LPG Water Heaters

LPG Water Heaters

Lpg Water heaters; lpg instant water heaters; lpg tankless water heaters;

LPG (Propane) 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;

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

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    SF14 – LGP tankless water heaters from Flexiheat UK – Internal picture

  • 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 hight 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 performace is the same for the direct feed and pumped versions

28kW Model performance data

 

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SFC and SFK28 LPG Domestic hot water performance by Flexiheat UK

 

34kW Model performance data

 

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SFC and SFK34 LPG Domestic hot water performance by Flexiheat UK

50kW Model performance data

 

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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

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

Or the vertical flue kit

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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 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.