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.



Perrymatic 50 Efficiency

SAP seasonal efficiency


Rating band



ManufacturerPerrymatics Boilers
ModelPerrymatic 50
Fuel TypeOil
Flue TypeOpen
FanNo Fan
Output (kW)14.6 - 14.6
Boiler ID
Manufactured From/ToUnknown - obsolete


The Perrymatics Perrymatic 50 is unrated, this probably means it's obsolete or very old.

The Perrymatic 50 is a Non-Condensing Conventional boiler with a maximum power output of 14.6kw that uses Oil as its fuel source.

Being an Unrated boiler it would be worthwhile replacing it with a higher efficiency 'A' rated boiler.


Similar Perrymatics Boilers to the Perrymatic 50
(Non-Condensing Oil Conventional)

Results ordered by efficiency. Some models may be obsolete.

Most Efficient Conventional Oil Boilers

Grant Vortex 36

97.0% Efficient