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.

Radiant Boilers

ModelTypeFuelEfficiency
Radiant B-Condense RHA 28/100CondensingGas87.2%
Radiant B-Condense RHA 28CondensingGas86.7%
Radiant B-condense RH 28CondensingGas86.3%
Radiant B-condense RHR 28CondensingGas86.2%
Radiant Radiant RK 50CondensingGas90.3%
Radiant Radiant RBS 24Non-CondensingGas79.0%
Radiant RBA CS 30 Non-CondensingGas80.8%
Radiant RBA CS 30/100 Non-CondensingGas81.1%
Radiant RBA/CS 100 E Non-CondensingGas78.6%
Radiant RBA/CS 24 E Non-CondensingGas78.3%
Radiant RBC 20 E Non-CondensingGas76.7%
Radiant RBS 20 E Non-CondensingGas77.5%
Radiant RBS 20 E MidyNon-CondensingGas79.6%
Radiant RH 25 CondensingGas86.3%
Radiant RH 25/B CondensingGas86.3%
Radiant RH 29 CondensingGas86.2%
Radiant RH 29/B CondensingGas86.2%
Radiant RH 34 CondensingGas86.3%
Radiant RH 34/B CondensingGas86.3%
Radiant RHA 25 CondensingGas86.7%
Radiant RHA 25/100 CondensingGas87.2%
Radiant RHA 29 CondensingGas86.6%
Radiant RHA 29/100 CondensingGas87.1%
Radiant RHA 34 CondensingGas86.7%
Radiant RHA 34/100 CondensingGas87.2%
Radiant RHR 25 CondensingGas86.2%
Radiant RHR 29 CondensingGas86.1%
Radiant RHR 34 CondensingGas86.2%
Radiant RK 18 CondensingGas90.5%
Radiant RK 18/B CondensingGas90.5%
Radiant RK 25 CondensingGas90.2%
Radiant RK 29 CondensingGas90.4%
Radiant RK 29/B CondensingGas90.4%
Radiant RK 34 CondensingGas90.5%
Radiant RK 34/B CondensingGas90.5%
Radiant RKA 100 CondensingGas91.1%
Radiant RKA 18 CondensingGas90.9%
Radiant RKA 18/100 CondensingGas91.4%
Radiant RKA 18/8 CondensingGas90.4%
Radiant RKA 25 CondensingGas90.7%
Radiant RKA 25/100 CondensingGas91.1%
Radiant RKA 25/8 CondensingGas90.1%
Radiant RKA 29 CondensingGas90.8%
Radiant RKA 29/100 CondensingGas91.3%
Radiant RKA 34 CondensingGas90.9%
Radiant RKA 34/100 CondensingGas91.4%
Radiant RKR 18 CondensingGas90.4%
Radiant RKR 25 CondensingGas90.1%
Radiant RKR 29 CondensingGas90.3%
Radiant RKR 34 CondensingGas90.4%
Radiant RMAS 20 Non-CondensingGas79.1%
Radiant RMAS 21 E NOx Non-CondensingGas80.3%
Radiant RMAS 21 E/3S Non-CondensingGas80.9%
Radiant RMAS 24 E Non-CondensingGas78.1%
Radiant RMAS 30 E Non-CondensingGas80.7%
Radiant RS 20 E Non-CondensingGas78.5%
Radiant RS 21 E NOx Non-CondensingGas79.8%
Radiant RS 21 E/3S Non-CondensingGas80.4%
Radiant RS 24 E Non-CondensingGas77.7%
Radiant RS 24 E MidyNon-CondensingGas79.4%
Radiant RS 30 E Non-CondensingGas80.2%
Radiant RSF 20 E Non-CondensingGas78.4%
Radiant RSF 21 E NOx Non-CondensingGas79.7%
Radiant RSF 21 E/3S Non-CondensingGas80.3%
Radiant RSF 24 E Non-CondensingGas77.6%
Radiant RSF 24 E SlimNon-CondensingGas79.3%
Radiant RSF 30 E Non-CondensingGas80.1%