If you are looking for a Main multipoint FF water heater, then the bad news is that these gas fired water heaters are no longer available, whether it was the standard model, which was obsolete in 2018, or the main multipoint FF water heater ERP model, which was discontinued around 2019, as this “Main water heater” couldn’t meet the lower NOx levels that were required to meet environmental legislation to reduce harmful emissions to help prevent global warming.
Sometimes the unit was referred to as a main multipoint ff boiler, in that the unit was a “hot water boiler”. The correct terminology is actually a “hot water heater,” as it produces domestic-quality warm water for bathing, washing, and other uses, rather than heating your radiators or underfloor in a central heating system.
But the good news is that we have a replacement for the main multipoint ff water heater that we stock on the shelf for immediate delivery in both natural gas or LPG gas powered options.
Our replacement unit, designated the “SF14”, is very similar in size to the old main multipoint ff water heater, so there should be no issues fitting the water heater as a replacement, and it also has electronic ignition, thus no pilot light or pilot flame to run, and this saves using gas unnecessary.
The Main Multipoint FF Gas Water Heater’s Design and Features
The Main Multipoint FF Water Heater was a modern room-sealed design, eliminating the need for a separate hot water storage cylinder, as the main multipoint FF water heater was an instantaneous water heater.
They were designed for hot water on demand 24 hours a day, with a sleek and compact design.
The Main Multipoint FF Water Heater had a gas ignition system that only ignited on demand for hot water, reducing energy costs and environmental impact.
These tankless water heaters came with a user-selectable thermostatic temperature control dial and a white finish.
Technical specifications and performance of the main multipoint FF water heater compared to the SF14 water heater replacement
The Main Multipoint FF Water Heater had a maximum nominal heat output of 24.5 kW and produced hot water flow rates that varied with temperature rise.
The SF14 water heater also has a maximum heat output of 24.5 kW.
Hot water performance
The main multipoint FF instantaneous water heater delivered warm water in the following manner:
Our replacement water heater, the SF14 water heating delivery performance is:
Water heater dimensions
The main multipoint FF boiler measured the following dimensions:
Main multipoint ff water heater dimensions
The SF14 tankless water heaters dimensions are:
SF14 tankless water heaters dimensions
The Main Multipoint FF Water Heater was only available in natural gas. Our SF14 is available in both natural gas and propane gas (LPG) versions, with the LPG version fuelled by either a 47 kg propane tank or cylinder, or alternatively by a bulk storage propane tank.
The unit had a high-quality design and construction, with a focus on reliability and performance.
The Main Multipoint FF Water Heater was designed to meet the required efficiency levels and reduce energy bills at the time of manufacture.
SF14 Product benefits and features
The highest quality wet chamber copper heat exchanger prevents thermal inertia and features large 16 mm diameter waterways, resulting in very low pressure drops, reduced clogging risks, increased thermal efficiency, and easier cleaning.
The NOx emissions are extremely low, with a maximum of 50 mg/kWh. The main multipoint FF water heater had a NOx level of 184 mg/kWh for comparison.
Modern room-sealed design – so no air vent required in the room.
Various flue pipe configurations – Co-axial, twin pipe flue systems etc.
East accessibility for maintenance and installation.
Self-diagnostic electronic board;
Overheat protection device.
There is a possibility of integration with other renewable energy sources, such as solar water heating.
Degree of electrical protection: IPX4D.
The full manual for the SF14 water heater can be downloaded here directly.
It is mandatory to have gas engineers (a qualified gas safe engineer by law) check the gas supply inlet pressure or burner pressure to ensure the correct rate of gas at install and service times. To find a gas safe heating engineer or plumber close to you, please use the following website: Gas safe register
Homeowners and plumbers or a tradesperson without the gas safe plumbing qualification must not attempt to replace parts or service gas water heaters; it is against the law.
Some spare parts are still available for the Main Multipoint FF Water Heater, including the gas isolation valve kit and thermocouple kit, but stock is diminishing and will run out at some point soon.
Flexiheat UK keeps stock of the Main Multipoint FF Water Heater replacement and offers expert advice and support in the event of any questions or concerns.
Contact Flexiheat UK
If you require further information or advice on our hot water product heating solutions, stock availability, delivery times, trade cost prices, or to order a replacement for the Main multipoint BF water heater, please use the contact us form on our website. Alternatively, you can call our customer service team experts at 01202 822221.
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Commercial instantaneous water heater options for reliable commercial water heating solutions
Commercial instantaneous water heaters,are often called commercial tankless water heaters or commercal on demand water heaters as they provide domestic hot water , without storage on demand for commercial premises in an energy efficient manner.
By far the most popular type of tankless water heaters for large communal residential and commercial applications, are gas fired units due to the output you can achieve from a relatively small gas pipe size.
Flexiheat UK offer instantaneous water heaters with power ratings of up to 200kW in single units and power ratings of up to 400kW in a cascade on demand water heaters configuration.
Typical applications for these instant water heaters include hotels, gyms, healthcare,process, bars, restaurants, brewing, food production, and farming.
Benefits of Instantaneous Commercial Water Heaters
Provide a reliable and energy efficient hot water supply for commercial premises.
Instantaneous water heaters reduce operating costs and environmental impact with energy-efficient technology
Increase customer satisfaction with a consistent hot water flow
Lare power ratings / Outputs – suitable for various commercial hot water heating applications, including restaurants, hotels, and hospitals
Cost effective / operating costs – The energy efficiency of instantaneous water heaters can be 24%–34% higher than that of traditional storage tank water heaters.Source Energy.gov
When combined with other heating systems, a commercial water heater, in particular instantaneous water heaters, provides a comprehensive solution.
This commercial on demand hot water heater range can provide hot water in very large volumes in an energy efficient manner for any commercial premises or to heat water for a process application.
Types of Commercial Water Heaters
Tankless water heaters: provide hot water on demand without the need for a storage tank
Instantaneous water heaters: heat water as it flows through the unit, providing a continuous hot water supply
The two types of water heaters mentioned above are identical. It’s just terminology; they are both commercial instantaneous hot water heaters.
Electric models: offer slightly greater energy efficiency and are only really suitable for smaller commercial demands due to the requirements of a 3-phase power supply and the Amps required to heat water.Also operating costs are more for electric powered water heaters.
Gas water heaters: the most popular and cost-effective option.
Product Selection and Recommendation
Collect information about your commercial application, including hot water heating demands and power requirements
Consider the specific needs of your commercial water heating demands when selecting a water heater
Our commercial tankless water heaters options
When a commercial instant water heater,tankless water heater or on demand water heaters have a kW rating of 50 kW or above for gas-fired units, we consider them a commercial water heater.
First we have our 50kW commercial tankless hot water heater
This commercial instant water heater benefits from a stainless steel heat exchanger featuring large 28-mm single-piece coils that provide very low pressure drops, less chance of clogging, more thermal efficiency, and easier cleaning.
This 50kW commercial instantaneous hot water heater features an inbuilt pump, which can be switched on or off depending on your system requirements, i.e., straight through on demand water heating or DHW recirculation heating system.
Internal picture of our 50kW commercial tankless hot water heater with stainless steel heat exchanger and inbuilt recirculation pump that allows a DHW recirculation system for instant hot water at the taps / showers etc.
Hot water performance i.e. flow rate of our gas fired 50kW commercial tankless hot water heater, at various temperature rises- shown as Delta T i.e. “Δt ”
Water Temperature Rise
Δt 20
Δt 25
Δt 30
Δt 35
Δt 40
Δt 50
Δt 60
Δt 75
Flow rate
SFK50
36.90
29.52
24.60
21.09
18.45
14.76
12.30
9.84
Litres/minute
2,214
1,771
1,476
1,265
1,107
886
738
590
Litres/hour
The dairy, brewing, food processing, and agricultural sectors, as well as other applications requiring high-temperature water for washdowns, pasteurization, or process water, commonly use this 50kW commercial instantaneous water heater as they are capable of producing a maximum water temperature of 85°C.
Features and benifits
The 50kW commercial on demand hot water heater will modulate up to 10:1 for increased efficiency and lower consumption.
Our commercial gas tankless water heater uses patented advanced burner technologies.
This commercial instant water heater has an integrated recirculation pump allowing the choice of direct flow through mode (draw) or a DHW recircualtion mode for immediate DHW supply.
Possible operating modes of our 50kW commercial tankless hot water heater – Direct (draw mode) with option of post circulation and DHW recirculation via the inbuilt DHW pump.
If the commercial gas tankless water heater needs to operate at temperatures higher than 60 °C, the hardness of the water must be less than 150 PPM.
The amount of carbonate, calcium, and magnesium minerals in water is measured to determine its hardness – 75 to 150 ppm is regarded moderately hard for reference.
Also on the other scale, do not soften the water to levels lower than 50 PPM, it turns acidic at these levels and may decrease the instant hot water heater’s lifespan by corroding parts of it.
Larger industrial and commercial instantaneous water heaters
In order to consistently satisfy instantaneous large capacity commercial and industrial domestic hot water (DHW) demands, we developed the “SFKG” family of floor-standing, high-efficiency condensing gas water heaters.These are an industrial tankless hot water heater range with very large domestic hot water heating performance.
Large instantaneous gas water heaters- condensing in cascade in one self-contained floor standing unit ,150kW or 200kW from Flexiheat UK
Ideal for both new and existing buildings with domestic hot water systems, such as hotels, restaurants, schools, hospitals, apartment buildings, and spas and leisure centres, that require instant water heaters.
High capacity instantaneous DHW systems
A compact single floor-standing gas fired commercial water with either three (150 kW model) or four (200 kW model) load-balanced 50 kW stainless steel heat exchangers within the casing that guarantees even wear along with integrated redundancy as standard.
SFKG – our Industrial on demand hot water heater range in 150kW or 200kW single units – 400kW in casacde.
Multiple heat exchangers within one water heater casing will consistently ensure operational continuation in the event of maintenance or malfunctions.
With built-in redundancy that ensures service continuity and multiple (three for the 150kW model or four for the 200kW model) integrated heat exchangers providing load balancing for optimum long-life operation.
Designed to provide hot water for both new and existing buildings domestic hot water systems, such as hotels, restaurants, schools, hospitals, apartment buildings, spas, leisure centres, or any other businesses that require high levels of hot water for their customers.
Compact floor-standing configuration instant water heaters which are condensing water heaters.
107.50% energy efficient at full power and 112% energy efficient at minimum power.
Both LPG and natural gas versions are available of these instant water heaters.
High-capacity instantaneous production of domestic hot water for commercial or industrial use.
Multiple stainless steel heat exchangers (the SKFG150 has three and the SFKG200 has four) provide built-in redundancy.
A high-efficiency pre-mix burner provides a large modulation range; the 150kW model has a 30:1 modulation range, and the 200kW model has a 40:1 modulation range.
5 year warranty on the heat exchanger (subject to terms and conditions), 2 year warranty on all other parts.
The heat exchangers’ large 28 mm diameter ensures very low pressure drops, lower risks of clogging, greater thermal efficiency, and greater ease of cleaning.
We recommend softening the water to a maximum hardness of 100 ppm if the total hardness of the water supply exceeds 150 ppm if the water heaters are water heating at a water temperature above 60 °C.
Maximum working pressure 8 bar, minimum working pressure 0.5 bar
Industrial instant hot water heater / Industrial inline water heater providing energy efficient and cost effective domestic hot water heating for industrial hot water heating systems.
150kW Industrial tankless water heater, gas-fired – hot water performance flow rate data – at various Delta T
Water Temperature Rise
Δt 20
Δt 25
Δt 30
Δt 35
Δt 40
Δt 50
Δt 60
Δt 75
Flow rate
SFKG 150
110.19
88.15
73.46
62.96
55.09
44.08
36.73
29.38
Litres/minute
6,611
5,289
4,408
3,778
3,306
2,645
2,204
1,763
Litres/hour
This 150kW industrial and commercial on demand gas water heater delivers exceptional instant hot water performance. A standard shower head has a flow rate of 7 litres per minute. In the winter, the temperature of the cold water mains is 10 degrees Celsius for the majority of the UK, while the showering temperature is 40 degrees Celsius, resulting in a temperature rise of 30 degrees. This 150kW commercial instantaneous hot water heater will supply 10 showers with continuous hot water if you have the water flow rate and gas supply required.
200kW Industrial tankless water heater, gas-fired – hot water performance flow rate data – at various Delta T
Water Temperature Rise
Δt 20
Δt 25
Δt 30
Δt 35
Δt 40
Δt 50
Δt 60
Δt 75
Flow rate
SFKG 200
146.92
117.53
97.94
83.95
73.46
58.77
48.97
39.18
Litres/minute
8,815
7,052
5,877
5,037
4,408
3,526
2,938
2,351
Litres/hour
Just to give you an idea of the incredible instant hot water performance of this 200kW industrial and commercial on demand gas water heater. A standard shower head has a flow rate of 7 litres a minute. In the winter the cold-water mains temperature is 10 Degrees C for the majority of the UK, and the showering temperature is 40C, thus a temperature rise of 30C. This 150kW commercial instantaneous hot water heater will supply 14 showers with continuous hot water, if you have the water flow rate and gas supply required.
Residential vs. Commercial Applications
The design of commercial water heaters meets the higher hot water demands of commercial water heating requirements.
Residential water heaters are often not suitable for commercial use due to lower power ratings and flow rates required to heat water in domestic applications.
We provide a comprehensive range of gas on demand water heaters for homes, apartments, and smaller projects. You can find more information about these on our dedicated webpage: instantaneous gas water heaters
Hydrogen ready water heating equipment
We have designed all of our commercial instantaneous hot water heaters to be hydrogen-ready and capable of operating on a 20% hydrogen blend, facilitating a seamless transition to zero-carbon emissions.
Commercial Water Heater Installation and Maintenance
Ensure proper installation by a qualified gas safe heating engineer to ensure safe and efficient operation.
Regular maintenance is necessary to extend the lifespan of any commercial water heaters. and prevent costly repairs or downtime.
Consider the installation and maintenance requirements of the commercial water heater, such as clearances, flue system requirements, etc.
Contact us
When you specify and install a Flexiheat energy efficient commercial and industrial on demand water heater, you can be confident that you will be getting the most durable, trouble-free water heater available.
Should you require further assistance or information on our commercial instantaneous water heater range, then please contact our sales team on 01202 822221 or click here for our email contact form.
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