80kW Boiler Gas Fired Condensing

30th July 2023/in News /by flexiheat

80kw Boiler – gas fired condensing

Our gas fired 80kW boiler is available in natural gas or for LPG applications. They are a high performance “A” rated ErP condensing boiler, and offer enhanced performance that exceeds the Part L building regulations for seasonal energy efficiency requirements.

This unit can be used for space heating, central heating, and domestic hot water production via a plate heat exchanger or indirect hot water cylinder or water heaters

Efficiency features: with a modulation ratio of 20:1, the automatic part load adjustment offers superb outputs down to 3.5 kw of heating output, which leads to better heat load matching of the system and lower fuel consumption and energy bills.

This energy efficient commercial boiler also has two stainless steel heat exchangers in one boiler as such, which ensures redundancy for your heating system; if one heat exchanger module fails, you still have up to 50% of your duty available. This feature can be vital in a commercial specification for a building that can’t be without some heat.

Wall Hung Gas Commercial Boiler

With the option of installing the boiler as a wall to wall solution or arranged inline on a free standing frame kit to offer enhanced performance.

Gas condensing boiler on a free-standing frame kit the R1K range 50kw to 120kw outputs from Flexiheat UK

The 80kW gas fired condensing boiler mounted on a free-standing frame kit with low loss header and plate heat exchanger of domestic hot water production.

We can provide a solution for every commercial specification, as we can cascade these high performance gas boilers up to 960 kW with automatic part load adjustment if so required.

For more details on this – please click here- cascading our commercial gas boilers

80kW commercial wall-hung boilers

As each boiler (heat exchanger) has its own flue non-return valve, you can service either boiler heat exchanger module without shutting the space heating system down.

Our energy efficient gas boilers are fitted with fully modulating low NOx burners (Class 6 combustion levels) and fan for low carbon solutions.

R1K75 gas condensing boiler output and energy efficiency figures – Part L building regulations

The latest revisions to Part L of the Building Regulations that came into force on June 15, 2023, mean that all new wet central heating systems should be sized for a maximum heating flow temperature of 55°C (previously 75°C plus boiler flow temperature were allowed), as required by Part L1A, and preferably lower if possible to achieve the maximum condensing effect of boilers.

Thus, our gas boiler will produce 79.35 kW ( close enough to 80 kW for us) when the heating system flow and return temperatures are 50/30 °C. However, should you require more kW output, please look at the next size boiler up our 100kW boiler which again is available in natural gas or for lpg applications and offers superb outputs up to 106.8 kW.

The unit will also provide 72.83 kW at 80/60 °C if you have a process heating application that is not covered in the Part “L” building regulations.

Full Data is shown in the following –

R1K75 gas condensing boiler output and energy efficiency figures Flexiheat UK

Output and energy efficiency figures for our R1K75

This is detailed in our full manual which can be downloaded here –

Manual for R1K 75 Gas condensing boiler – Internal version Flexiheat UK

Should you require a larger output gas boiler (we do up to 240 kW in a single boiler), then we do a full range, which is listed here.

Commercial gas condensing boilers

Specifications

“A” rated wall hung boiler – for commercial use or very large home heating applications.
Energy efficient condensing boilers up to 105.8 % at 100% heat input at 50/ 30°C
Stainless steel heat exchanger with 28mm diameter water ways that ensure the boiler from very low pressure drops, guarantees lower risks of clogging (more resistance to fouling up), greater thermal efficiency, and greater ease of cleaning.
Intelligent fault system: if the boiler has a fault, it will tell you exactly what has gone wrong, i.e., if the heating system pressure is too low, etc.
Pressure sensor to monitor system pressure as part of the intelligent fault system
Maximum heating operating system pressure = 3 Bar
Maximum heating operating system pressure = 0.3 Bar
Can be controlled by an “Opentherm” controller, such as a “Hive” or “Nest” type, which means you can control the boiler on the go from your mobile phone, tablet, or PC, just like our full range of smaller domestic counterparts that we supply.
BMS compatible with our 0-10 Volt free contact kit

Dimensions of this commercial boiler: 80 kW gas-fired

This commercial boiler has the following compact dimensions:

Dimensions of our 80kw condensing boiler gas fired in natural gas or LPG- ErP "A" rated for central heating (radiators or underfloor heating) and domestic hot water via an indirect domestic hot water cylinder from Flexiheat UK

A small compact energy efficient gas condensing boiler 80 kW with ErP “A” rated for central heating (radiators or underfloor heating) and domestic hot water via an indirect domestic hot water cylinder.

Connection details at the bottom of the unit: flow and return connections, gas connection, and condensate drain.

Free standing boiler frame detail

Gas fired 80kw condensing boiler on a free standing frame with low loss header Flexiheat UK

The gas condensing boiler on a free standing frame kit with low loss header.

80kW gas system boiler

Are these an 80kW gas system boiler? Yes, in that they have a pump (two actually, i.e., one for each heat exchanger module), but at this size of system boiler, we can’t fit an expansion vessel within the boiler casing, so one needs to be fitted to the pipework external to the boiler to make the unit a full system boiler.

Flue options

Each heat exchanger module has its own flue exit. You can either individually flue each unit with a co-axial flue (80mm/125mm) should you wish to go room sealed up to 10 metres vertically or horizontally. However, if you use a split flue system, you can go up to 40 metres vertically or horizontally.

The last option is a common flue header for the boiler.

R1K75 gas boiler with common flue header option

Common flue pipe header option

Gas-fired 80 kW Boiler

Should you require more product information, check stock, technical support, or prices on our high performance 80kw boiler in natural gas or LPG ,then please don’t hesitate to contact our sales team on 01202 822221 or use our email contact form via the contact tab above to message us.

Buffer tank with coil or twin coils

28th July 2023/in News /by flexiheat

Buffer tank with coil or twin coils

A buffer tank with coil or coils is used to hydraulically separate a heat source or sources, in the event of a twin coil buffer tank, from the heating system’s hot water. This can be required for mechanical engineering reasons such as flow rate or temperature difference between the heating system and the heating source , which is often the case with heat pump heating systems, be they air source heat pumps or geothermal heating systems.

With a full range of buffer tanks from 260 litres in hot water storage volume all the way up to 5,000 litres of storage capacity, we have the volumes to satisfy any application or performance requirements for your inertia tank.

We do two ranges which will detail below

Why use a buffer with a coil ?

The coil acts as a heat exchanger, separating the hot water generated from a heat pump, boiler, or solar thermal fluid in the event of a solar thermal system from the hot heating water in the thermal storage tanks.

This can ensure that there are no problems with flow rates between the heated water from the heat source and the heating system, and also temperature differences, i.e., some solar system fluids can get up to 200 °C, whereas the storage tank temperature ratings are either 95 °C or 110 °C maximum. Thus, the use of a heat exchanger coil within the buffer tank is required.

The coils used are not a stainless steel coil , like those used in an indirect water heater that produces domestic hot water. We are not producing domestic hot water in a buffer tank with an intermediate heating coil to produce hot water for the heating system. The coils are made of steel, just like the thermal storage tanks.

Which means these buffer tanks must be used on a sealed heating system only, and the heating water must be treated with a corrosion inhibitor.

Domestic hot water production

If you want a Buffer tank with a stainless steel coil to produce domestic hot water, then these are called Thermal store hot water cylinders or Thermal store cylinders – and we go into more detail on this range here: https://www.flexiheatuk.com/product/thermal-store-cylinders/ as these are our units for instantaneous domestic hot water heating or production via a stainless steel coil within the thermal storage tank and are available in volumes from 500 litres of storage to 2000 litres in range or size.

Single heat exchanger models

The first range is the “G” range. These are rated

Maximum working pressure: Coil – 25 Bar – Tank 6 bar

Maximum working temperature: Coil – 200 ºC – Tank 110 ºC

Single coil buffer tanks the G-IF or G-IFS range 260 litres to 1500 litres that are thermal stores to accommodate peak loads for the heating system, using an intermediate coil to hydraulically separate the heat source from the heating system water in a hot water cylinder from Flexiheat UK

The storage tank also has an immersion heater port, should you wish to install an immersion heater as a back up or top up heat source.

Technical data: The “G -IS” buffer tank range has larger tapping ports than the “G – IFS” buffer tank range, which has the standard 40mm (1-1/2″) See “EH” detail on the following:

G range of buffer tanks with single coil or heat exchanger detailing the hot water tapping detail on the buffer tank or thermal stores and heat exchanger detail Flexiheat UK

G-IS and G-IFS Buffer tank with a single coil / heat exchanger technical detail

Larger Size Storage Tank

Thermal storage tanks with hot water storage volumes ranging from 1,500 to 5,000 litres with a single coil.

These buffer tanks are available with an inspection and clean out manhole that is 400mm in diameter and are designated the “ISB” version.

Or as the standard unit without which is designated the “IS” version.

Technical detail

The full detail on the above tanks can be found in the following brochure – pages 12 & 13

Buffer Tanks Brochure Flexiheat UK

Solar thermal heating systems

Some fluids in the solar system can be heated to 200 °C. If this is the case, you need to use our “G” or “MV” range. However, if your water or fluid temperature is less than 110 °C, then we have another buffer tank product with a single coil, and these are detailed here:

Twin coil buffer tanks

Twin coil or two heat exchanger buffer tanks are suitable for applications with two energy heating systems feeding the thermal storage tanks. For example, one coil or heat exchanger can be fed by a thermal solar system, which is usually the lower coil in the buffer tank. The second coil or heat exchanger, which is located in the upper part of the buffer tank, can be fed by heat generated from either a traditional gas or oil boiler or heat pump heating systems, which can be either ground source heat pumps or air source heat pumps.

Our Twin coil buffer tanks from 300 to 2,000 Litres in volume

These units are available from 300 to 2,000 litres in demand capacity.

The twin coil range has a heat exchanger maximum hot water temperature rating of 110 °C and 12 Bar pressure .

The buffer tank’s maximum temperature rating is 95 °C, and the pressure rating varies with the volume; please see the brochure for full details.

Flexiheat brochure for PPS2 Buffer tank with twin coils for sealed heating systems

Buffer tank with a coil or coils

Should you require more product information, availability, technical support, or prices on our complete range of buffer tanks with coil or coils then please don’t hesitate to get in touch. Contact our sales service team on 01202 822221 or use our email contact form via the contact tab above to message us.

1000 Litre Buffer Vessel or Tank

5th July 2023/in News /by flexiheat

1000 Litre buffer vessel or tank

Our 1000 litre buffer vessel or 1000 litre buffer tank is a hot water buffer tank or vessel that is typically installed to increase the volume of hot water in the heating system to store heated water.

Our buffer tanks or accumulator tanks are as such a thermal store for hot water systems and this energy is stored for later use, resulting in fewer but longer heating cycles for heat pump systems, wood pellet boilers, gasification boilers or a biomass heating system.

This is 1000 litre buffer tank is just one of our large range of buffer tanks and vessels . Our full large range of other size buffer tanks is detailed on this webpage – Buffer tanks

Heat pump systems

This buffer tank is ideal for use with heat pump systems, allow approximately 25 litres of volume per kW of heat pump output if the manufacturer hasn’t specified a buffer tank / accumulator tank volume.

Wood pellet boilers

For wood pellet boilers sizing – allow a minimum of 10 litres of buffer tank volume for every 1 kW of boiler output.

Gasification boilers

For gasification boilers or log fired biomass boilers – allow a minimum of 50 litres of buffer tank volume for every 1 kW of boiler output.

1000 Litre Vessel – Buffer tank product description

This 1000 litre buffer vessel / accumulator tank is pressure rated to 3 Bar and maximum temperature of 95C for sealed heating systems and are not to be used on chilled water.

This 1,000L buffer vessel, or buffer tank is manufactured from mild steel or carbon steel. Please note corrosion inhibitors must be used on the heating water system to protect the product i.e. the buffer tank from corrosion .

Technical specifications of our buffer tanks / accumulator tanks are as follows –

1000 Litre Buffer vessel port details for the buffer plus range from Flexiheat UK to store heating hot water from various energy sources for peak demand use in hot water systems.

1000 Litre Buffer vessel / Accumulator tank / Cylinder thermal store for heating water

Buffer tank storage capacity – 1000 Litres nominal – 840 Litres Actual

Buffer tank height – 2,065 mm

Buffer tank pivot height – 2,270 mm

Diameter with Insulation: 940 mm

Diameter without Insulation: 790 mm

This 1000 litre buffer vessel has a removeable insulation system, that allows you to get the unit through a standard 800mm wide door.

Product insulation is polyurethane – 75 mm insulation

Rigid expanded polyurethane insulation with 95% closed cells, CFC and HCFC free, fire resistance to class B2 according to DIN 4102-1.

The insulation is removable – which can help to get the buffer tank through doorways or access points

Great quality product at a great price and available from stock or on a short delivery

Buffer tank weight – 160 Kg when empty – 1,000 Kg’s when full with hot water

Eight tappings – 1 1/2″ female BSP, which enables the installation of immersion heaters as back up or top up heating

Four sensor or thermometer tappings – 1/2″ female BSP

1 x Air vent eliminator or safety valve tapping – 1 1/2″ female BSP

For full dimensions please see the following brochure –

Download the Buffer Plus range of buffer tanks and vessels brochure from Flexiheat UK

Contact Us

If you require further information, product availability, check stock levels, delivery times or prices on our 1000 Litre buffer vessel / accumulator tanks for sealed heating systems or other sizes from our large range of accumulator tanks, then please contact our sales service team on 01202 822221 or use our email contact form via the contact tab above to message us.

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