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.



Capriz 25 Efficiency

SAP seasonal efficiency


Rating band

Band B


ManufacturerHeatline Boilers
ModelCapriz 25
Fuel TypeGas
Flue TypeRoom-Sealed
FanFan Assisted
Output (kW)24.7 - 24.7
Boiler IDGC No 47-157-12
Manufactured From/To2008 - 2009


The Heatline Capriz 25 is a 'B' rated boiler which has good efficiency of 86.0%.

The Capriz 25 is a Condensing Combi boiler with a maximum power output of 24.7kw that uses Gas as its fuel source.

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


Similar Heatline Boilers to the Capriz 25
(Condensing Gas Combi)

Results ordered by efficiency. Some models may be obsolete.

Heatline Sargon 24

90.0% Efficient

Heatline Sargon 35

90.0% Efficient

Heatline Sargon 30

90.0% Efficient

Heatline Vizo Plus 24

90.0% Efficient

Most Efficient Combi Gas Boilers

Alpha CD50

91.2% Efficient