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Potterton Promax SL Boilers

Potterton Promax SL Boilers may be compact in size, but it is extremely powerful. It comes in a range of five heating outputs and its slim line dimensions make it perfect for installing into kitchen cupboards. Potterton Promax SL Boilers average prices start from around £550 excluding VAT and installation costs.

This lightweight heat only boiler comes with many great features including a wall-mounting bracket and a comprehensive range of fluing options which allow for easy installation. Compartment ventilation is not required to fit it, which also saves time. Hot water can be provided by an indirect cylinder.

Potterton Promax SL Boilers are also versatile because its range of heating outputs caters for different property sizes, hot water and heating demands. It has a SEDBUK A rating for energy efficiency, ultra low NOx emissions for reduced environmental impact and has also been recommended by the Energy Saving Trust.

For peace of mind it comes with a standard parts and labour warranty.

Potterton Promax SL Boilers Overview


ModelTypeDimensionsMaximum Flow RateOutputEfficiency RatingTypical Price
Promax 12 SLHeat OnlyH – 600 mm
W – 390 mm
D – 280 mm
N/A12 kWA 90% and above£560.7
Promax 15 SLHeat OnlyH – 600 mm
W – 390 mm
D – 280 mm
N/A15 kWA 90% and above£678
Promax 18 SLHeat OnlyH – 600 mm
W – 390 mm
D – 280 mm
N/A18 kWA 90% and above£690
Promax 24 SLHeat OnlyH – 600 mm
W – 390 mm
D – 280 mm
N/A24 kWA 90% and above£736
Promax 30 SLHeat OnlyH – 600 mm
W – 390 mm
D – 280 mm
N/A30 kWA 90% and above£786
Key Features & Benefits
SEDBUK Band AHigh Energy Efficiency
Fully Modulating NOx Burner and FanEconomical to run and kinder to the environment
Robust Aluminium Heat ExchangersState of the art
Recommended by Energy Saving TrustEnvironmentally Friendly
Slim Line DimensionsEasy to fit, space saving
Suitable for a fitting into kitchen cupboardsSpace Saving
Multi-directional fluing optionsEasy installation in difficult places
Compartment Ventilation not neededSaves Installation Time
Part s and Labour WarrantyPeace of Mind

What we think of the Potterton Promax SL

This range of five boilers covers five different heat outputs: 12kW, 15kW, 18kW, 24kW and 30kW. They are ideal for a flat, right up to a reasonably sized house. They are heat only, or open vent boilers, which means that they are based on more traditional systems which use a cold water cistern and an expansion tank. They are not like Combi boilers which supply hot water on demand. The heat only system does take up more space, but because it sends hot water to a storage tank, it does mean that there is a large amount of hot water which is useful for an ensuite, or a second bathroom.

Even though these boilers are powerful and can cope with most situations, they weigh just 26kg, which is very slim and one of the best compared with other manufacturers. These boilers are also designed to be wall mounted. Controls are basic and there is a small window so that you can reassure yourself that the pilot light is still on.

Getting a Competitive Boiler Quote

A new boiler is a considerable investment, so comparing prices is highly advisable before you part with your cash. A good place to start is by getting a quote from a well-known national installer and also getting a few from local boiler installers. Comparing them will help you make an informed decision.

Also remember only a Gas Safe Registered engineer can carry out a new boiler installation safely and properly. It is vital that you check the credentials of your engineer before you agree anything.

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