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Ariston Microsystem 21 RFFI 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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Ariston Microsystem 21 RFFI Efficiency

SAP seasonal efficiency80.4%
Rating bandBand D


ManufacturerAriston Boilers
ModelMicrosystem 21 RFFI
Fuel TypeGas
Flue TypeRoom-Sealed
FanFan Assisted
Output (kW)21.0 - 21.0
Boiler IDGC No. 41-116-06
Manufactured From/To2000 - 2007


The Ariston Microsystem 21 RFFI is a 'D' rated boiler with an efficiency of 80.4%.

The Microsystem 21 RFFI is a Non-Condensing Conventional boiler with a maximum power output of 21.0kw 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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(Non-Condensing Gas Conventional)

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