Ariston - Boiler Efficiency Rating

Compare new boilers and assess whether your current boiler needs to be replaced.

A boiler’s energy rating is an indicator of its efficiency when used within an average domestic household. It’s a great benchmark for comparing new boilers and can help you work out how much money you could save on energy bills if you replaced your current boiler with a more efficient model.

You can find out the energy efficiency of your boiler by checking its energy rating; you can do this now by selecting the make and model below.

How efficient is your boiler?

Select your boiler using the dropdown below to find out.

Ariston Boilers

ModelTypeFuelEfficiency
AristonACO 27 MFFICondensingGas90.4%
AristonACO 27 RFFICondensingGas90.5%
AristonACO 32 MFFICondensingGas90.4%
AristonACO 32 RFFICondensingGas90.5%
AristonACO 35 HP MFFIACO 35 HP MFFICondensingGas90.2%
AristonClas 21 FF SystemNon-CondensingGas80.4%
AristonClas 24 FFNon-CondensingGas80.3%
AristonClas 28 FF SystemNon-CondensingGas80.4%
AristonClas HE 18 SystemCondensingGas90.2%
AristonClas HE 24CondensingGas90.3%
AristonClas HE 24 SystemCondensingGas90.4%
AristonClas HE 30CondensingGas90.3%
AristonClas HE 38CondensingGas90.1%
AristonClas HE evo 24CondensingGas90.0%
AristonClas HE evo 30CondensingGas90.1%
AristonClas HE evo 38CondensingGas90.1%
AristonClas HE R 12CondensingGas90.2%
AristonClas HE R 18CondensingGas90.2%
AristonClas HE R 24CondensingGas90.4%
AristonClas HE System 30CondensingGas90.4%
AristonClas HE System evo 18CondensingGas90.2%
AristonClas HE System evo 24CondensingGas90.1%
AristonClas HE System evo 30CondensingGas90.2%
AristonCombi A 24 MFFICombi ACondensingGas90.3%
AristonCombi A 30 MFFICombi ACondensingGas90.3%
AristonE-Combi 24CondensingGas90.3%
AristonE-Combi 30CondensingGas90.3%
AristonE-Combi 38CondensingGas90.1%
AristonE-Combi evo 24CondensingGas90.0%
AristonE-Combi evo 30CondensingGas90.1%
AristonE-Combi evo 38CondensingGas90.1%
AristonE-System 24CondensingGas90.4%
AristonE-System 30CondensingGas90.4%
AristonE-System evo 24CondensingGas90.1%
AristonE-System evo 30CondensingGas90.2%
AristonEcocombi 27 MFFImicroCONDENS SeriesCondensingGas90.4%
AristonEcocombi 27 MFFImicroCONDENS SeriesCondensingLPG91.6%
AristonEcogenus 24 MFFICondensingGas88.4%
AristonEcogenus 24 MFFIMk2CondensingGas89.7%
AristonEcogenus 24 RFFI SystemCondensingGas88.5%
AristonEcogenus 24 RFFI SystemMk2CondensingGas89.8%
AristonEcosystem 27 RFFImicroCONDENS SeriesCondensingGas90.5%
AristonEurocombi A/23 MFFINon-CondensingGas78.1%
AristonEurocombi A/27 MFFINon-CondensingGas78.9%
AristonExcalibur 23 MFFIExcalibur 80 MFFINon-CondensingGas80.1%
AristonExcalibur 27 MFFIExcalibur 100 MFFINon-CondensingGas79.4%
AristonGenus 27 BFFI PlusNon-CondensingGas78.1%
AristonGenus 27 BFFI PlusMk2Non-CondensingGas80.0%
AristonGenus 27 RFFI SystemNon-CondensingGas79.0%
AristonGenus 30 MFFINon-CondensingGas79.3%
AristonGenus HE 24CondensingGas90.3%
AristonGenus HE 24 SystemCondensingGas90.4%
AristonGenus HE 30CondensingGas90.3%
AristonGenus HE 38CondensingGas90.1%
AristonGenus HE System 30CondensingGas90.4%
AristonGenus Plus 30 BFFINon-CondensingGas79.2%
AristonGenus Plus 30 BFFINon-CondensingLPG81.0%
AristonIntesa TP 23 MFFINon-CondensingGas80.2%
AristonIntesa TP 30 MFFINon-CondensingGas79.9%
AristonMicrocombi 23 MFFINon-CondensingGas80.1%
AristonMicrocombi 27 MFFIMicro Combi SeriesNon-CondensingGas79.4%
AristonMicrocombi 27 MFFIMK2Non-CondensingLPG81.2%
AristonMicrogenus 23 MFFINon-CondensingGas80.3%
AristonMicrogenus 24 HE MFFICondensingGas87.6%
AristonMicrogenus 27 MFFINon-CondensingGas80.2%
AristonMicrogenus 28 HE MFFICondensingGas87.1%
AristonMicrogenus 32 HE MFFICondensingGas87.3%
AristonMicrogenus II 24 MFFINon-CondensingGas80.2%
AristonMicrogenus II 24 MFFINon-CondensingLPG82.0%
AristonMicrogenus II 28 MFFINon-CondensingGas79.6%
AristonMicrogenus II 28 MFFINon-CondensingLPG81.4%
AristonMicrogenus II 31 MFFINon-CondensingGas79.9%
AristonMicrogenus II 31 MFFINon-CondensingLPG81.7%
AristonMicrosystem 10 RFFINon-CondensingGas78.2%
AristonMicrosystem 15 RFFINon-CondensingGas79.9%
AristonMicrosystem 21 RFFINon-CondensingGas80.4%
AristonMicrosystem 28 RFFINon-CondensingGas80.3%

What are SEDBUK Efficiency Ratings?

From 1999 to 2015 boilers were ranked on the SEDBUK scale which stands for ‘Seasonal Efficiency of a Domestic Boiler in the UK’. While many still refer to SEDBUK as the standard energy rating scale, it was actually replaced in 2015 by the Energy related Products directive, or ErP. It’s directly related to the EU’s ambition to improve the energy efficiency of our homes and achieve the following targets by 2020:

  • 20% reduction in EU greenhouse gas emissions (compared to 1990 levels)
  • 20% improvement in overall energy efficiency (across the EU)
  • 20% more energy produced from renewable resources such as solar or biomass.

Under the current ErP standards, boiler manufacturers are required to label their products with a rating from A++ to G, with G being the least efficient a boiler can be. In September 2019, efficiency grade A+++ will be added and the least efficient class, G, will be removed as an option, removing these products from the market as a result.

How Much Money Could I Save with a More Efficient Boiler

To understand how a new boiler could save you money, you need to consider the energy that an inefficient boiler is wasting. For example, if a boiler is only 70% efficient, for every £1 you spend on heating your home, 30p is being wasted on lost energy. If your new boiler can reach efficiency of 90%, that is just 10p lost of every £1. So that’s a saving of 20p in every £1 which really adds up over time.

The financial savings you could make by replacing your boiler with a more efficient model can be significant, but will vary depending on the size of your home, the fuel used by the boiler and the inefficiency of your existing boiler.

According to the Energy Saving Trust: “Replacing an old gas boiler with a programmer and room thermostat, with a new A-rated condensing boiler with a programmer, room thermostat and thermostatic radiator controls (TRVs) could save you:

Old Boiler ErP RatingEfficiencyDetached houseSemi-detached houseMid-terrace house
D78 – 82%£170£110£100
E74 – 78%£190£125£105
F70-74%£220£145£125
G<70%£320£210£180

Figures taken from the latest research by the Energy Saving Trust. Based on fuel prices as of April 2017.

For new boiler installations visit Boiler Guide to request quotes from independent local and regional heating engineers.