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


Get Free, No Obligation Boiler Quotes

Worcester 25Si - LL RSF Gas - Boiler Efficiency Ratings

Boiler Efficiency Rating

You can find out the energy efficiency of your boiler by checking its energy rating; you can do this now by selecting the make and model below.

A boiler’s energy rating is an indicator of its efficiency when used within an average domestic household. It's a great benchmark for comparing new boilers and can help you work out how much money you could save on energy bills if you replaced your current boiler with a more efficient model.

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.

Worcester 25Si - LL RSF Efficiency

SAP seasonal efficiency78.0%
Rating bandBand D


ManufacturerWorcester Boilers
Model25Si - LL RSF
Fuel TypeGas
Flue TypeRoom-Sealed
FanFan Assisted
Output (kW)25 - 25
Boiler ID47 311 49
Manufactured From/To1999 - 2002


The Worcester 25Si - LL RSF is a 'D' rated boiler with an efficiency of 78.0%.

The 25Si - LL RSF is a Non-Condensing Combi boiler with a maximum power output of 25kw that uses Gas as its fuel source.

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

Similar Worcester Boilers to the 25Si - LL RSF
(Non-Condensing Gas Combi)

Results ordered by efficiency. Some models may be obsolete.

Most Efficient Combi Gas Boilers