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Thorn EMI Heating Marathon 44/54b 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.

Thorn EMI Heating Marathon 44/54b Efficiency

SAP seasonal efficiency65%
Rating bandUnknown


ManufacturerThorn EMI Heating Boilers
ModelMarathon 44/54b
Fuel TypeGas
Flue TypeRoom-Sealed
FanNo Fan
Output (kW)12.9 - 15.8
Boiler ID4178947
Manufactured From/ToUnknown - 1983


The Thorn EMI Heating Marathon 44/54b is unrated, this probably means it's obsolete or very old.

The Marathon 44/54b is a Non-Condensing Conventional boiler with a maximum power output of 15.8kw 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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(Non-Condensing Gas Conventional)

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