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Warmflow G-Series GS25B Gas - Boiler Efficiency Ratings

Boiler Efficiency Rating

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 0800 327 7119 for a no-obligation quote, alternatively visit Boiler Guide to request quotes from independent local and regional heating engineers.

Warmflow G-Series GS25B Efficiency

SAP seasonal efficiency86.3%
Rating bandBand B


ManufacturerWarmflow Boilers
ModelG-Series GS25B
Fuel TypeGas
Flue TypeRoom-Sealed
FanFan Assisted
Output (kW)25.51 - 25.51
Boiler ID
Manufactured From/To2007 - current


The Warmflow G-Series GS25B is a 'B' rated boiler which has good efficiency of 86.3%.

The G-Series GS25B is a Condensing Conventional boiler with a maximum power output of 25.51kw 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 Warmflow Boilers to the G-Series GS25B
(Condensing Gas Conventional)

Results ordered by efficiency. Some models may be obsolete.

Most Efficient Conventional Gas Boilers