Potterton Promax SL Heat Boiler


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  • Next Day Delivery
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  • 12kW, 15kW, 18kW, 24kW outputs available - a model to suit most sizes of property
  • N0x Class 5 - best in class
  • Simple mounting plate - for a quick and easy installation
  • No pump overrun - shortening installation time further
  • Pre-plumbing jig -  saving time on installation
  • Compatible with Megaflo Eco Solar Cylinder

install date after checkout

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ErP product information 

NOx  mg/kWh  20 20 20 19 
Sound power level, indoors  LwaDB  38  46  49  52 
Space heating efficiency class   
EcoHomes    3


Electrical supply  Volts/Hz  230/50  230/50  230/50  230/50 
Permanent live required  No No No No
Power consumption  Watts  80 80 80 80
External fuse rating  Amps 
Boiler IPX rating (electrical protection)   IPX2  IPX2  IPX2  IPX2 
Integral ‘boiler only’ frost thermostat    No No No No


Gas supply connection  inch 1/2 1/2 1/2 1/2
Central heating connections  mm  22  22  22  22 
Condensate drain connection  inch 1.0 1.0 1.0 1.0
Upward piping route mm  Yes   Yes   Yes   Yes  


Compartment ventilation required   No  No  No  No

Concentric flue systems 

 Concentric flue diameters   70/110  
Concentric standard flue length mm  800 800 800 800
Max equiv vertical length (ø70/110)  4 4 4 4
Max equiv horizontal length (ø70/110)  4 4 4 4

Twin flue system 

Twin flue pipe diameter  mm  80/80 80/80 80/80 80/80
Max equiv length vertical length  75 75 75 75
Max equiv length horizontal length   75 75 75 75

Plume displacement kit 

Compatibility  ✓  ✓  ✓  ✓ 


Gross packaged boiler weight  kg 36.2  36.2  36.2  36.2 
Max installation lift weight  kg  26 26 26 26
Packaged boiler dimensions (WxHxDxSCxUCxLCxFC)   390mm x 600mm x 280mm x 5mm x 200mm x 50mm x 5mm (500mm for servicing) 


Available in the choice of four outputs of 12kW, 15kW, 18kW and 24kW, the Promax SL Heat is small enough to fit in a standard kitchen unit and light enough for quick and easy installation.

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The Potterton Promax SL Heat is a highly efficient heating solution with an excellent SAP 2012 rating and comes with a 2 year warranty as standard for complete peace of mind*. Installation can be made even faster with the use of a simple mounting plate, and is class 5 NOx as standard.

You can register your Potterton boiler online using Baxi’s warranty registration form.

Terms and conditions apply.

Please note: warranty and purchasing information on this site applies to the UK only. For information on how to buy these products in the Republic of Ireland, please visit Baxi Potterton Myson.

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