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Potterton Myson Heating Marathon 120/150c Gas - Boiler Efficiency Ratings

Boiler Efficiency Rating

You can check your boilers rating by selecting it's make and model below. Ratings are based on the SEDBUK Rating which is an indicator of its efficiency when used within an average domestic household, it's a great benchmark for comparing new boilers and also assessing whether your current boiler would be better off being replaced due to low efficiencies.

For new boiler installations call British Gas Boilers on 0800 327 7119 for a no-obligation quote, alternatively visit Boiler Guide to request quotes from independent local and regional heating engineers.

Potterton Myson Heating Marathon 120/150c Efficiency

SAP seasonal efficiency65%
Rating bandUnknown


ManufacturerPotterton Myson Heating Boilers
ModelMarathon 120/150c
Fuel TypeGas
Flue TypeOpen
FanNo Fan
Output (kW)41.47 - 41.47
Boiler ID4178952
Manufactured From/ToUnknown - 1988


The Potterton Myson Heating Marathon 120/150c is unrated, this probably means it's obsolete or very old.

The Marathon 120/150c is a Non-Condensing Conventional boiler with a maximum power output of 41.47kw that uses Gas as its fuel source.

Being an Unrated boiler it would be worthwhile replacing it with a higher efficiency 'A' rated boiler.

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