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.



Combipac 90-120 Efficiency

SAP seasonal efficiency


Rating band

Band C


ManufacturerFirebird Boilers
ModelCombipac 90-120
Fuel TypeOil
Flue TypeOpen
FanNo Fan
Output (kW)26.38 - 35.17
Boiler ID
Manufactured From/To2003 - current


The Firebird Combipac 90-120 is a 'C' rated boiler with an efficiency of 82.9%.

The Combipac 90-120 is a Non-Condensing Combi boiler with a maximum power output of 35.17kw 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 Combipac 90-120
(Non-Condensing Oil Combi)

Results ordered by efficiency. Some models may be obsolete.

Firebird Combipac 115

83.0% Efficient

Firebird CombiPac 90

83.0% Efficient

Firebird Combi 115

83% Efficient

Firebird Combi 90

83% Efficient

Most Efficient Combi Oil Boilers