Potterton Promax Combi Boiler


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  • N0x Class 5 - best in class
  • Fully modulating and highly efficient - the Promax Combi intelligently uses the right amount of fuel to meet the set central heating temperature, saving the end user money on fuel bills
  • Pre-plumbing jig - saving time on installation 
  • Compatible with Multifit GasSaver
  • End users can see savings of up to 37% on gas for domestic hot water
  • Flueing options of up to 20m - offering flexibility for a variety of different housing projects
  • Optional stand-off bracket - allows pipes to be routed behind the boiler
  • Separate central heating and domestic hot water controls 
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Units  24  28  33 
Sales code 7219453 7219455 7219456


Concealed user controls    Yes  Yes   Yes  
Operating mode selector switch with reset    Yes   Yes   Yes  
User adjustable DHW temperature    Yes   Yes   Yes  
User adjustable CH temperature    Yes   Yes   Yes  
LED temp/status/fault diagnosis display    Yes   Yes   Yes  
Integral 24hr electro-mechanical timer    Optional Optional Optional
Integral 7 day electronic timer    Optional  Optional  Optional 
Single channel wireless programmable room thermostat  Optional  Optional  Optional 
Weather outdoor sensor    Optional  Optional  Optional 


Gas (natural gas/LPG) NG NG NG
Inlet supply pressure mbar 20  20  20 
Maximum gas rate  m3/hr  2.6  3.1  3.6 
Heat input central heating (CH)  kW Max Gross (QnHs)  22.7 27.4 32.1 
kW Min Gross (QnHs)  7.8  10  10.8 
Heat output CH non-condensing  kW Max (Pn)  20.6  24.7  28.9
kW min (Pn)  6.8 8.7  9.4 
Heat output CH condensing  kW max (Pnc)  21 25.9 30.3
kW min (Pnc)  7.4 9.5 10.2
Heat input domestic hot water  kW Max Gross (QnwHs)  27.4 32.1 37.7
Heat output domestic hot water  kW Max (Pn)  24 28  33
SAP 2009/2012 annual efficiency (PCDB/SEDBUK)  89.0 89.0  89.0 
NOx class   


The Potterton Promax Combi boiler has been designed specifically for new build and social housing projects. Available in outputs of 24kW, 28kW and 33kW, the Promax Combi is easy to install and can be fitted in the majority of domestic property sizes.

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The Promax Combi is a fully modulating boiler, offering end users gas savings of up to 37% when installed with a Gas Saver flue gas heat recovery unit. With flueing options of up to 20m and built in frost protection, the Promax Combi is a versatile and reliable boiler which can be easily installed in a number of locations across small, medium and large-scale installation projects.

To register a Potterton Promax Combi, click here

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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