Saunier Duval - 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.

Saunier Duval Boilers

Saunier Duval50050fNon-CondensingGas68%
Saunier Duval50060fNon-CondensingGas68%
Saunier Duval50040fNon-CondensingGas68%
Saunier Duval50030fNon-CondensingGas68%
Saunier Duval50060cNon-CondensingGas65%
Saunier Duval50080bNon-CondensingGas65%
Saunier Duval50060bNon-CondensingGas65%
Saunier Duval50050cNon-CondensingGas65%
Saunier Duval50050bNon-CondensingGas65%
Saunier Duval50040cNon-CondensingGas65%
Saunier Duval50040bNon-CondensingGas65%
Saunier Duval50030cNon-CondensingGas65%
Saunier Duval50030bNon-CondensingGas65%
Saunier Duval50ff/LPNon-CondensingLPG80.1%
Saunier DuvalEcosy 24ECondensingGas90.6%
Saunier DuvalEcosy 28ECondensingGas90.4%
Saunier DuvalEcosy SB24ECondensingGas90.7%
Saunier DuvalEcosy SB28ECondensingGas90.5%
Saunier DuvalEnviroPlus F28ECondensingGas90.3%
Saunier DuvalEnviroPlus F28E SBCondensingGas90.4%
Saunier DuvalEnvirotek F28ECondensingGas90.3%
Saunier DuvalEnvirotek F28E SBCondensingGas90.4%
Saunier DuvalIsofast Condens F35eCondensingGas90.2%
Saunier DuvalIsofast F28ENon-CondensingGas79.4%
Saunier DuvalIsofast F35ENon-CondensingGas78.6%
Saunier DuvalIsomax F28EANon-CondensingGas78.9%
Saunier DuvalSaunier Duval F30ENon-CondensingGas79.6%
Saunier DuvalSd623Non-CondensingGas70.0%
Saunier DuvalSd235CNon-CondensingGas65%
Saunier DuvalSD Isotwin Condens F35 ECondensingGas90.6%
Saunier DuvalSD Isotwin Condens F35 ECondensingLPG92%
Saunier DuvalSD Thema Condens F 18 E SBCondensingGas90.2%
Saunier DuvalSD Thema Condens F 18 E SBCondensingLPG91.6%
Saunier DuvalSD Thema Condens F 24 ECondensingGas90.1%
Saunier DuvalSD Thema Condens F 24 ECondensingLPG91.5%
Saunier DuvalSD Thema Condens F 30 ECondensingGas90.2%
Saunier DuvalSD Thema Condens F 30 ECondensingLPG91.6%
Saunier DuvalSD Themaplus Condens F 30 ECondensingGas90.2%
Saunier DuvalSD Themaplus Condens F 30 ECondensingLPG91.6%
Saunier DuvalSemia Condens F24ECondensingGas86.6%
Saunier DuvalSemia Condens F30ECondensingGas86.9%
Saunier DuvalSystem 40030Non-CondensingGas68%
Saunier DuvalSystem 40040Non-CondensingGas68%
Saunier DuvalSystem 40055Non-CondensingGas68%
Saunier DuvalSystem 40065Non-CondensingGas68%
Saunier DuvalSystem 40080Non-CondensingGas68%
Saunier DuvalTheliaTwin 28eNon-CondensingGas70%
Saunier DuvalTheliaSB23Non-CondensingGas70%
Saunier DuvalThelia30Non-CondensingGas70%
Saunier DuvalThelia23ENon-CondensingGas70%
Saunier DuvalThelia23Non-CondensingGas70%
Saunier DuvalThema Classic F24ENon-CondensingGas78.3%
Saunier DuvalThema Classic F24E PlusNon-CondensingGas78.3%
Saunier DuvalThema Classic F30E PlusNon-CondensingGas79.6%
Saunier DuvalThema Classic F30E SBNon-CondensingGas79.7%
Saunier DuvalThema Classic F35ENon-CondensingGas78.6%
Saunier DuvalThemis23Non-CondensingGas65%
Saunier DuvalXeon 18 HECondensingGas90.4%
Saunier DuvalXeon 30 HECondensingGas90.6%
Saunier DuvalXeon 30ffNon-CondensingGas79.7%
Saunier DuvalXeon 30ff/LPNon-CondensingLPG78.0%
Saunier DuvalXeon 30HE LPGCondensingLPG92.2%
Saunier DuvalXeon 40ffNon-CondensingGas78.7%
Saunier DuvalXeon 40ff/LPNon-CondensingLPG78.0%
Saunier DuvalXeon 50ffNon-CondensingGas78.8%
Saunier DuvalXeon 60ffNon-CondensingGas79.4%
Saunier DuvalXeon 60ff/LPNon-CondensingLPG77.5%
Saunier DuvalXeon 80 ffNon-CondensingGas79.4%
Saunier DuvalXeon 80ffNon-CondensingGas76.3%
Saunier DuvalXeon 80ff/LPNon-CondensingLPG79.8%
Saunier DuvalXeon Condens 18CondensingGas90.4%
Saunier DuvalXeon Condens 30CondensingGas90.6%
Saunier DuvalXeon Condens 30 LPGCondensingLPG92.2%
Saunier DuvalXeon40ffNon-CondensingGas75.4%

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

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.