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Merlin Internal Wall Hung 40/65 CF Oil - Boiler Efficiency Ratings

Boiler Efficiency Rating

You can find out the energy efficiency of your boiler by checking its energy rating; you can do this now by selecting the make and model below.

A boiler’s energy rating is an indicator of its efficiency when used within an average domestic household. It's a great benchmark for comparing new boilers and can help you work out how much money you could save on energy bills if you replaced your current boiler with a more efficient model.

For new boiler installations call British Gas Boilers on 0333 230 5216 for a no-obligation quote. Alternatively visit Boiler Guide to request quotes from independent local and regional heating engineers.

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.

Similar Merlin Boilers to the Internal Wall Hung 40/65 CF
(Non-Condensing Oil Conventional)

Results ordered by efficiency. Some models may be obsolete.

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