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Worcester 25Si - LL RSF 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.

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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.

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