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Mistral C3 90/120 Standard Oil - 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.

Mistral C3 90/120 Standard Efficiency

SAP seasonal efficiency85.7%
Rating bandBand C


ManufacturerMistral Boilers
ModelC3 90/120 Standard
Fuel TypeOil
Flue TypeOpen or Room-Sealed
FanFan Assisted
Output (kW)26.4 - 35.2
Boiler ID
Manufactured From/To2006 - current


The Mistral C3 90/120 Standard is a 'C' rated boiler with an efficiency of 85.7%.

The C3 90/120 Standard is a Non-Condensing Conventional boiler with a maximum power output of 35.2kw that uses Oil as its fuel source.

Although a 'C' rated boiler is not as efficient as many other modern boilers it's still pretty good, only a marginal reduction in fuel bills and carbon dioxide emissions would be observed by replacing it.

Similar Mistral Boilers to the C3 90/120 Standard
(Non-Condensing Oil Conventional)

Results ordered by efficiency. Some models may be obsolete.

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