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Merlin Internal Wall Hung 40/65 CF Oil - 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.

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Merlin Internal Wall Hung 40/65 CF Efficiency

SAP seasonal efficiency81.9%
Rating bandBand D


ManufacturerMerlin Boilers
ModelInternal Wall Hung 40/65 CF
Fuel TypeOil
Flue TypeOpen
FanNo Fan
Output (kW)11.7 - 19
Boiler ID
Manufactured From/To1995 - current


The Merlin Internal Wall Hung 40/65 CF is a 'D' rated boiler with an efficiency of 81.9%.

The Internal Wall Hung 40/65 CF is a Non-Condensing Conventional boiler with a maximum power output of 19kw that uses Oil as its fuel source.

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

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