Promax System

Designed for properties with high hot water demands, the Promax System from Potterton is a fully modulating and highly efficient single box solution.

Suitable for

Social Housing

New Builds

Promax System product image

Single boiler output
12kW, 15kW, 18kW, 24kW & 32kW

Flueing options
Up to 20 metres

Quicker installation time
Pre-plumbing jig

Developed with robust hydraulic connections, the Promax System boiler offers reliability and quality as standard, as well as an exceptional SAP rating.

The Promax System is available in outputs of 12kW, 15kW, 18kW, 24kW and 32kW so there is a model to suit most property sizes. With flueing options of up to 20m it allows for greater flexibility of siting, making the Potterton Promax System ideal for a  variety of different newbuild projects and social housing projects and comes with full support.

To register a Potterton System boiler online, click here 

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.

Potterton Promax System

Units  12 15 18 24  32k 
Sales code 7219457 7219458 7219459 7219460  7219461 


Concealed user controls    Yes  Yes   Yes   Yes    Yes   
Operating mode selector switch with reset    Yes   Yes   Yes   Yes    Yes   
User adjustable CH temperature    Yes   Yes   Yes   Yes    Yes   
LED operating status display    Yes   Yes   Yes   Yes    Yes   


Gas (natural gas/LPG) NG NG NG NG  NG 
Inlet supply pressure mbar 20  20  20  20  20 
Maximum gas rate  m3/hr  1.31 1.69  1.95  2.61  3.48 
Heat input central heating (CH)  kW Max Gross (QnHs)  13.8 17.1 20.5  27.4  36.4 
kW Min Gross (QnHs)  4.4 4.0 4.5 7.8  10.8 
Heat output CH non-condensing  kW Max (Pn)  12.4 15.4 18.5 24.7  36.4 
kW min (Pn)  3.9 3.9 4.2 6.8  9.4 
Heat output CH condensing  kW max (Pnc)  13 16.2 19.4 25.9  34.4 
kW min (Pnc)  4.2 4.2 4.5 7.4  10.2 
SAP 2009/2012 annual efficiency (PCDB/SEDBUK)  89.0 89.0  89.0  89.0  89.0 
NOx class   
View full technical specification table

Download the full technical specification for the Promax System

When clicked this will open the product specification in PDF format.

The following accessories and controls are compatible with the Potterton Promax System. To find out more, visit our Accessories and Controls page.

  • EP1 Programmer
  • EP2 Programmer
  • Filling loop kit
  • Stand off kit (facilitates vertical pipe runs behind boiler)
  • Multifit gas saver (natural gas)
  • Multifit (gas saver) expansion vessel kit
  • Gas saver - stand off kit
  • Multifit condensate trace heating kit 1m
  • Multifit condensate trace heating kit 2m
  • Multifit condensate trace heating kit 3m
  • Multifit condensate trace heating kit 5m
  • Multifit External Boiler Discharge Pump (PRV and condensate)
  • Terminal guard ∅ 60/100
  • Stainless steel PDK guard ∅ 60/100 - air intake S/S

Interested in this product for your premises? Complete the form below and someone from the team will contact you shortly.

Alternatively, speak to your Business Development Manager about this or any of our products.


Totally Dependable