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.



Contractor 50/70 WM HE Efficiency

SAP seasonal efficiency


Rating band

Band A


ManufacturerTrianco Boilers
ModelContractor 50/70 WM HE
Fuel TypeOil
Flue TypeRoom-Sealed
FanFan Assisted
Output (kW)14.88 - 21.3
Boiler ID2385
Manufactured From/To2007 - current


The Trianco Contractor 50/70 WM HE is an 'A' rated boiler which has an excellent efficiency of 90.0%.

The Contractor 50/70 WM HE is a Condensing Conventional boiler with a maximum power output of 21.3kw 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 Trianco Boilers to the Contractor 50/70 WM HE
(Condensing Oil Conventional)

Results ordered by efficiency. Some models may be obsolete.

Most Efficient Conventional Oil Boilers

Grant Vortex 36

97.0% Efficient