Boiler Efficiency Ratings

Compare new boilers and assess whether your current boiler would be better off being replaced

Our boiler efficiency tables provided by SEDBUK (the seasonal efficiency of domestic boilers in the UK) provide a guide of how effective your boiler is at turning fuel into heat.

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 0333 230 5216 for a no-obligation quote, alternatively visit Boiler Guide to request quotes from independent local and regional heating engineers.



Morocco 40 Efficiency

SAP seasonal efficiency


Rating band

Band F


ManufacturerMaxol Boilers
ModelMorocco 40
Fuel TypeGas
Flue TypeRoom-Sealed
FanNo Fan
Output (kW)11.7 - 11.7
Boiler IDMaxol
Manufactured From/To1988 - current


The Maxol Morocco 40 is an 'F' rated boiler with a poor efficiency of 71.4%.

The Morocco 40 is a Non-Condensing Conventional boiler with a maximum power output of 11.7kw that uses Gas as its fuel source.

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


Similar Maxol Boilers to the Morocco 40
(Non-Condensing Gas Conventional)

Results ordered by efficiency. Some models may be obsolete.

Maxol Microsystem 402RF

79.9% Efficient

Maxol Microsystem 402MDF

79.9% Efficient

Maxol Microturbo 402MDF

79.9% Efficient

Maxol Microturbo 402 RF

79.9% Efficient

Most Efficient Conventional Gas Boilers

Baxi Solo 15 HE A

91.3% Efficient

Main 15 HE A

91.3% Efficient

Potterton Promax SL 15

91.3% Efficient

Potterton Gold H 15

91.3% Efficient