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Ideal Classic SE18 RS 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 SE18 RS Efficiency

SAP seasonal efficiency79.0%
Rating bandBand D


ManufacturerIdeal Boilers
ModelClassic SE18 RS
Fuel TypeGas
Flue TypeRoom-Sealed
FanNo Fan
Output (kW)17.6 - 17.6
Boiler IDGC No. 41 395 99
Manufactured From/To2003 - current


The Ideal Classic SE18 RS is a 'D' rated boiler with an efficiency of 79.0%.

The Classic SE18 RS is a Non-Condensing Conventional boiler with a maximum power output of 17.6kw 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 Ideal Boilers to the Classic SE18 RS
(Non-Condensing Gas Conventional)

Results ordered by efficiency. Some models may be obsolete.

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