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.



Wm 50/65f Efficiency

SAP seasonal efficiency


Rating band



ManufacturerTrianco Boilers
ModelWm 50/65f
Fuel TypeGas
Flue TypeRoom-Sealed
FanFan Assisted
Output (kW)19.05 - 19.05
Boiler ID4189833
Manufactured From/ToUnknown - 1992


The Trianco Wm 50/65f is unrated, this probably means it's obsolete or very old.

The Wm 50/65f is a Non-Condensing Conventional boiler with a maximum power output of 19.05kw that uses Gas as its fuel source.

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


Similar Trianco Boilers to the Wm 50/65f
(Non-Condensing Gas Conventional)

Results ordered by efficiency. Some models may be obsolete.

Trianco Eurostar 50/65

76.5% Efficient

Trianco Wm 20/35f

72% Efficient

Trianco Wm 65/80f

72% Efficient

Trianco Wm 35/50f

72% Efficient

Most Efficient Conventional Gas Boilers

Baxi Solo 15 HE A

91.3% Efficient

Main 15 HE A

91.3% Efficient

Potterton Promax SL 15

91.3% Efficient

Potterton Gold H 15

91.3% Efficient