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.



CBH4 - 1215 Boiler House Efficiency

SAP seasonal efficiency


Rating band

Band A


ManufacturerMistral Boilers
ModelCBH4 - 1215 Boiler House
Fuel TypeOil
Flue TypeOpen or Room-Sealed
FanNo Fan
Output (kW)35.2 - 44
Boiler ID
Manufactured From/To2004 - current


The Mistral CBH4 - 1215 Boiler House is an 'A' rated boiler which has an excellent efficiency of 91.4%.

The CBH4 - 1215 Boiler House is a Condensing Conventional boiler with a maximum power output of 44kw that uses Oil as its fuel source.

As this boiler is 'A' rated it will provide efficient heating and subsequently reduce fuel bills and carbon dioxide emissions.


Similar Mistral Boilers to the CBH4 - 1215 Boiler House
(Condensing Oil Conventional)

Results ordered by efficiency. Some models may be obsolete.

Most Efficient Conventional Oil Boilers

Grant Vortex 36

97.0% Efficient