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Ideal Classic RS 250 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.

Ideal Classic RS 250 Efficiency

SAP seasonal efficiency72.3%
Rating bandBand F


ManufacturerIdeal Boilers
ModelClassic RS 250
Fuel TypeGas
Flue TypeRoom-Sealed
FanNo Fan
Output (kW)11.7 - 14.7
Boiler IDG.C.41 387 12
Manufactured From/ToUnknown - current


The Ideal Classic RS 250 is an 'F' rated boiler with a poor efficiency of 72.3%.

The Classic RS 250 is a Non-Condensing Conventional boiler with a maximum power output of 14.7kw 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 Ideal Boilers to the Classic RS 250
(Non-Condensing Gas Conventional)

Results ordered by efficiency. Some models may be obsolete.

Most Efficient Conventional Gas Boilers