Commercial Gas Water Heaters Range

Commercial / Industrial Gas Fired Water Heaters – up to 400kW of output – Condensing – ErP A rated Domestic Hot Water – Low NOx for commercial or industrial applications

Commercial gas water heaters – Our commercial and industrial hot water gas fired heating systems, can accommodate a wide range of customer requirements and hot water demands, regardless of your hot water requirements, we’ll have the correct commercial water heater for your needs, whether its on-demand (continuous flow) or storage water heaters for commercial use, we have the solution.

Our commercial water heaters provide a hot water system, with precise temperature control, by combining a condensing gas water heater in conjunction with a stainless steel hot water storage tank to suit your commercial water heater requirements.

By splitting the gas water heaters from the hot water storage tank, gives us the ability to offer unique solutions to meet the needs of every project for its domestic hot water requirements be it commercial or industrial applications.Thus,we have a tankless water heater with buffer tank.Like so:

A schematic / diagram showing our commercial water heater – A gas tankless water heater, (which is a condensing water heater) with a buffer tank for domestic hot water storage for commercial water heating applications.

This enables you to position the water heater element on a wall, utilize a straightforward horizontal or vertical flue kit (co-axial or conventional flueing options) to minimize installation time and flue costs, and then adjust the storage water tank’s location to align with the site’s requirements.

For larger commercial water heaters, we can provide a floor-mounted unit complete with all the necessary flow and return pipework as part of a comprehensive commercial water heater package. These units can have outputs of 150 kW or 200 kW in single units, and currently, they can reach up to 400 kW in a cascade (we are working on expanding this up to 8 units in cascade).

Thus, for smaller applications such as health care facilities, doctors surgeries, and hairdresser salons which tend to have a constant hot water systems demand throughout the day, or for larger hot water systems demands such as sports facilities, hotels or showering blocks, which tend to have a higher peak load with short recovery times, we can combine the relevant size storage water tank, with single commercial gas tankless water heater or “multiple commercial gas tankless water heaters” in one floor standing casing to suit the duty required for the hot water systems.

Please note that all gas fired commercial water heaters now must be condensing water heaters, as the new part “L” building regulations for the UK that came into force on 15th June 2022, requires that condensing gas water heaters must be used on existing as well as newly constructed non-domestic buildings i.e., commercial, and industrial domestic hot water heating. Condensing water heaters are more efficient and produce less pollution, with all our gas fired water heaters being a condensing commercial water heater, we welcome this requirement for domestic hot water systems, which will help reduce the impact on global warming.

1. You can place the commercial water heater where you want, for the easiest and most convenient location to suit the site requirements, and the DHW storage tank, again where you require (within reason),this gives maximum flexibility for our water heating solutions.

2. These commercial water heaters can either be wall mounted  – or floor mounted  for our 150kW or 200kW models – which are “plug and play” –  just pipe up to the commercial water heater and your away (see pictures below)

Gas fired commercial and industrial water heaters from Flexiheat UK. These are used in commercial and industrial water heating applications in conjunction with a DHW buffer tank for storage volume.

3. This often makes flueing the system easy – most people wall hang the units, and go straight out the wall with a horizontal flue kit – or you can go into a common header for a single flue system, we have various flueing options for all site requirements.

4. The problem with the older version direct fired gas water heaters – is that the water tanks are often glass lined, the continual heating up and cooling process – causes them to crack over time, as well as the water attacks the glass lining, meaning they have to have sacrificial or permeant anodes in them – These need servicing / replacing and often get missed – causing the domestic hot water condensing gas water heaters to fail.

Traditional gas fired commercial water heaters – When the tanks fail, they must be completely replaced. Separating the water heater and tank is a good practice for commercial heating of hot water systems

5. Built-in redundancy – should you want to service one of the units – you can still have the other running – if one fails goes you still have 50% of capacity available. A great feature for industrial applications.

6. Our gas fired water heaters are ErP Compliant – “A” rated – Condensing gas water heaters – maximum efficiency, lower fuel bills.

7. Very low NOx emissions- maximum 50 mg / kWh – kinder to the environment with our patented advanced burner technologies.

8. Modulation of these condensing water heaters – each 50kw unit is 10:1,and our 200kW has a modulation range of 40:1

9. Stainless steel 28 mm Ø heat exchanger for full flow, and less chance of getting blocked.

We believe in stainless water storage tanks – it’s the best of the best – as they say – No sacrificial anodes are required! for our ERP compliant commercial water heaters. Our domestic hot water storage tank range options has its own webpage.

Water heaters for commercial premises

Whether you want a gas commercial water heater for your school, surgery, offices, warehouse, restaurant, fast food outlet or any other type of commercial premises, our commercial water heaters, which are condensing gas water heaters are the most economical and energy efficient solution. This range of commercial gas water heater are condensing water heaters and have energy efficient levels of 105%

Should you want more advice on sizing a storage water heaters please click here – how to size a commercial water heater 

Storage water heater or continuous flow hot water systems ?

Gas fired storage water heaters, are a good solution for commercial or industrial hot water systems, as their fast recovery rate of hot water means they are great for a high-volume hot water demand, that can be required for hotels, guest houses, commercial kitchens, shower blocks, health facilities etc.

If your demand is not that high, then you can look at our continuous flow hot water / gas multipoint heaters range, which are condensing tankless water heaters / instantaneous gas water heaters. This product range are very efficient, as they do not use tanks of stored hot water and only heat as much water as you require, rather than having a tankful of water sat around waiting to be used.

The downside of continuous flow water heaters or gas multi point water heaters, are two-fold –

1.If you have a particularly high hot water demand, a multipoint gas water heater may not be able to keep up,although we do some very large capacity commercial instantaneous gas fired water heaters with up to 200 kW of output in a single water heater or 400 kW when used in cascade, which can produce up to 11,754 litres per hour with a temperature rise of 30 °C, which are detailed on this webpage – commercial instantaneous water heater range

2.If you require a lot of hot water in several points at the same time, the gas demand requirements may be too much to supply your hot water heating system

Flow water heaters

The above term is just another referring name to products or items which are actually flow continuous hot water heating or instantaneous gas fired water products – we supply a range of commercial flow water heaters that are either condensing water heaters or non condensing water heater here – gas multipoint water heaters. All of these units are ERP compliant.

However sometimes a storage water heater is required due to the performance required for your hot water system.

Hot water performance of our commercial water heating gas appliances

Following is the hot water heating performance data , for our commercial condensing gas fired storage water heater range, which are available as either natural (G30) or LPG (G31) propane fuelled

Larger commercial water heaters

A compact floor-standing gas fired commercial water range with either three (150 kW model) or four (200 kW model) load-balanced 50 kW stainless steel heat exchangers with large 28mm waterways to ensure low pressure drops and less chance of blocking within the casing that guarantees even wear along with integrated redundancy as standard.

The 150kW commercial water heater has a turndown or modulation ratio of 30:1, whilst our 200kW commercial water heater has a turndown or modulation ratio of 40:1, for better water heating load demand matching.

With each heat exchanger features an integrated non-return flue flap, allowing for individual servicing while the others continue to operate. So, no water heater down time is required for servicing these commercial water heaters.

Large instantaneous gas water heaters- condensing in cascade in one self-contained floor standing unit ,150kW or 200kW from Flexiheat UK

Download the Commercial gas water heaters SFKG 150kW and 200kW  brochure from Flexiheat UK

First our 150kW condensing water heaters / commercial water heaters performance

For 150kW cascaded commercial water heater – A 300 litre storage tank/ buffer vessel is the minimum capacity

Then our 200kW condensing water heaters / commercial water heaters performance

For 200kW cascaded commercial water heater – A 300 litre storage tank/ buffer vessel is the minimum capacity

For the sake of brevity, we have the data up to 400kW of power input, if you want an industrial gas water heater of this size, just let us know the storage volume and we’ll send you the data tables. This cascade water heater system can support a maximum of 2 water heaters with a single control unit and achieve a modulation of 80:1 for higher yields and reduced energy consumption, and can provide up to 196 litres / minute of domestic hot water with a temperature rise of 30 Degrees C.

Commercial water heaters – storage water heaters system diagram

Using an industrial & commercial gas hot water heater. A tankless water heater with buffer tank for DHW storage for larger demands.

These commercial water heaters (gas water heaters) combined with a DHW storage tank provide consistent DHW at a steady temperature, even during minor withdrawals.

• This commercial water heating system satisfies both peak periods and continuous DHW demands.
• It lowers the number of burner ignitions for small withdrawals, thereby saving costs and reducing emissions.
• DHW is more readily available during peak withdrawal periods.

Our commercial water heaters can also be used to top up other water heating sources, such as solar

Our commerical hot water heater gas fired providing top up domestic hot water heating to a solar water heating system

Internal or external instantaneous water heaters option

We have a 50kW or 100kW ErP compliant low NOx commercial water heater which are tankless water heaters or instantaneous water heaters that come pre-packaged hot water systems or water heaters, that can be used in a cascade installation of up to 300kW – which can be installed internally or externally as the come complete with an ABS cover for outdoor installation.These units can be coupled up to a DHW buffer tank should you require stored hot water.

50kw or 100kW Internal or external commercial gas water heater – packaged for easy installation – plug and play as such

Temperature controllers

You can control the water temperature of these commercial water heaters in the onboard control panel or alternatively remote water temperature controllers are available that allow precise temperature control by the user of these condensing gas water heaters.

Quality and Guarantees

Our commercial water heaters are manufactured in accordance with ISO 9001 and ISO 1400i certified management systems and testing techniques. Should you require more information or data on these products- Commercial Gas Water Heaters, or hot water systems then please contact our sales teams for the best water heating solutions for your commercial premises or industrial applications . You can contact our office on 01202 822221 for prices for this range of commercial water heaters products and latest offers.