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.



Eurostar Premier External 100/125 Efficiency

SAP seasonal efficiency


Rating band

Band A


ManufacturerTrianco Boilers
ModelEurostar Premier External 100/125
Fuel TypeOil
Flue TypeOpen or Room-Sealed
FanFan Assisted
Output (kW)36.6 - 36.6
Boiler ID
Manufactured From/To2005 - current


The Trianco Eurostar Premier External 100/125 is an 'A' rated boiler which has an excellent efficiency of 91.6%.

The Eurostar Premier External 100/125 is a Condensing Conventional boiler with a maximum power output of 36.6kw 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 Eurostar Premier External 100/125
(Condensing Oil Conventional)

Results ordered by efficiency. Some models may be obsolete.

Most Efficient Conventional Oil Boilers

Grant Vortex 36

97.0% Efficient