News, Views & Reviews on Domestic Central Heating, Boiler & Renewable Energy


Get Free, No Obligation Boiler Quotes

Glow-worm Ultimate 40BF 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.

Glow-worm Ultimate 40BF Efficiency

SAP seasonal efficiency72.1%
Rating bandBand F


ManufacturerGlow-worm Boilers
ModelUltimate 40BF
Fuel TypeGas
Flue TypeRoom-Sealed
FanNo Fan
Output (kW)8.79 - 11.72
Boiler ID41 319 52
Manufactured From/To1993 - 2002


The Glow-worm Ultimate 40BF is an 'F' rated boiler with a poor efficiency of 72.1%.

The Ultimate 40BF is a Non-Condensing Conventional boiler with a maximum power output of 11.72kw that uses Gas as its fuel source.

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

Similar Glow-worm Boilers to the Ultimate 40BF
(Non-Condensing Gas Conventional)

Results ordered by efficiency. Some models may be obsolete.

Most Efficient Conventional Gas Boilers