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.



Oylympic Boilerhouse 90-115 Efficiency

SAP seasonal efficiency


Rating band

Band C


ManufacturerFirebird Boilers
ModelOylympic Boilerhouse 90-115
Fuel TypeOil
Flue TypeRoom-Sealed
FanNo Fan
Output (kW)26.38 - 33.70
Boiler ID
Manufactured From/To1997 - 2010


The Firebird Oylympic Boilerhouse 90-115 is a 'C' rated boiler with an efficiency of 85.7%.

The Oylympic Boilerhouse 90-115 is a Non-Condensing Conventional boiler with a maximum power output of 33.70kw that uses Oil as its fuel source.

Although a 'C' rated boiler is not as efficient as many other modern boilers it's still pretty good, only a marginal reduction in fuel bills and carbon dioxide emissions would be observed by replacing it.


Similar Firebird Boilers to the Oylympic Boilerhouse 90-115
(Non-Condensing Oil Conventional)

Results ordered by efficiency. Some models may be obsolete.

Most Efficient Conventional Oil Boilers

Grant Vortex 36

97.0% Efficient