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Viessmann Vitodens 300 WB3A - 66kW 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.

Viessmann Vitodens 300 WB3A - 66kW Efficiency

SAP seasonal efficiency90.1%
Rating bandBand A


ManufacturerViessmann Boilers
ModelVitodens 300 WB3A - 66kW
Fuel TypeGas
Flue TypeRoom-Sealed
FanFan Assisted
Output (kW)60.1 - 60.1
Boiler ID
Manufactured From/To2004 - current


The Viessmann Vitodens 300 WB3A - 66kW is an 'A' rated boiler which has an excellent efficiency of 90.1%.

The Vitodens 300 WB3A - 66kW is a Condensing Conventional boiler with a maximum power output of 60.1kw that uses Gas as its fuel source.

As this boiler is 'A' rated it will provide efficient heating and subsequently reduce fuel bills and carbon dioxide emissions.

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