Viessmann - 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.

Viessmann Boilers

ModelTypeFuelEfficiency
ViessmannVitodens 100WB10CondensingGas90.1%
ViessmannVitodens 100WB14CondensingGas90.0%
ViessmannVitodens 100WB1A - 24kWCondensingGas90.1%
ViessmannVitodens 100 CombiWB1A - 30kWCondensingGas90.1%
ViessmannVitodens 100 CombiWB1A 24kwCondensingGas90.0%
ViessmannVitodens 100 CompactWB1A 8-24kWCondensingGas90.5%
ViessmannVitodens 100 CompactWB1A 8-18kWCondensingGas90.4%
ViessmannVitodens 100 W WB1B35kW System BoilerCondensingGas90.5%
ViessmannVitodens 100 W WB1B26kW Regular Boiler open ventCondensingGas90.4%
ViessmannVitodens 100 W WB1B30kW System BoilerCondensingGas90.4%
ViessmannVitodens 100 W WB1B26kW System BoilerCondensingGas90.3%
ViessmannVitodens 100 W WB1B30kW Combi BoilerCondensingGas90.3%
ViessmannVitodens 100 W WB1B16kW Regular Boiler open ventCondensingGas90.3%
ViessmannVitodens 100 W WB1B35kW Combi BoilerCondensingGas90.3%
ViessmannVitodens 100 W WB1B13kW Regular Boiler open ventCondensingGas90.2%
ViessmannVitodens 100 W WB1B19kW Regular Boiler open ventCondensingGas90.2%
ViessmannVitodens 100 W WB1B26kW Combi BoilerCondensingGas90.0%
ViessmannVitodens 100 W WB1B35kW System BoilerCondensingLPG92.5%
ViessmannVitodens 100 W WB1B30kW System BoilerCondensingLPG92.4%
ViessmannVitodens 100 W WB1B30 kW Combi BoilerCondensingLPG92.3%
ViessmannVitodens 100 W WB1B35kW Combi BoilerCondensingLPG92.3%
ViessmannVitodens 100 W WB1B26kW Regular Boiler open ventCondensingLPG92.3%
ViessmannVitodens 100 W WB1B13kW Regular Boiler open ventCondensingLPG91.9%
ViessmannVitodens 100 W WB1B19kW Regular Boiler open ventCondensingLPG91.9%
ViessmannVitodens 100 W WB1B16kW Regular Boiler open ventCondensingLPG91.9%
ViessmannVitodens 100 W WB1B26kw Combi BoilerCondensingLPG91.8%
ViessmannVitodens 100 W WB1B26kW System BoilerCondensingLPG91.3%
ViessmannVitodens 100-WWB1C 30kW System BoilerCondensingGas90.4%
ViessmannVitodens 100-WWB1C 26kW System BoilerCondensingGas90.4%
ViessmannVitodens 100-WWB1C 30kW Combi BoilerCondensingGas90.3%
ViessmannVitodens 100-WWB1C 19kW System BoilerCondensingGas90.3%
ViessmannVitodens 100-WWB1C 35kW System BoilerCondensingGas90.3%
ViessmannVitodens 100-WWB1C 26kW Combi BoilerCondensingGas90.3%
ViessmannVitodens 100-WBPJA 25kW P29CondensingGas90.3%
ViessmannVitodens 100-WWB1C 35kW CombiCondensingGas90.2%
ViessmannVitodens 100-WBPJA 21kW P25CondensingGas90.2%
ViessmannVitodens 100-WWB1C 35kW System BoilerCondensingLPG92.4%
ViessmannVitodens 100-WWB1C 35kW Combi BoilerCondensingLPG92.3%
ViessmannVitodens 100-WBPJA 25 kW P29CondensingLPG92.2%
ViessmannVitodens 100-WWB1C 26kW System BoilerCondensingLPG92.1%
ViessmannVitodens 100-WWB1C 19kW System BoilerCondensingLPG92.1%
ViessmannVitodens 100-WWB1C 26kW Combi BoilerCondensingLPG92.0%
ViessmannVitodens 100-WBPJA 21kW P25CondensingLPG92.0%
ViessmannVitodens 100-WWB1C 30kW System BoilerCondensingLPG91.9%
ViessmannVitodens 100-WWB1C 30kW Combi BoilerCondensingLPG91.8%
ViessmannVitodens 100-w wb1a13kWCondensingGas90.8%
ViessmannVitodens 100-W WB1B35kW Regular Boiler Open VentCondensingLPG91.4%
ViessmannVitodens 100W WB1B35kW Regular Boiler Open VentCondensingGas90.1%
ViessmannVitodens 111-WB1LA 26kWCondensingGas90.7%
ViessmannVitodens 111-WB1LA 35kWCondensingGas90.6%
ViessmannVitodens 111-WB1LA 35kWCondensingLPG92.7%
ViessmannVitodens 111-WB1LA 26kWCondensingLPG92.4%
ViessmannVitodens 200WB2-32kWCondensingGas90.4%
ViessmannVitodens 200WB2-24kWCondensingGas90.2%
ViessmannVitodens 200WB2-44kWCondensingGas90.2%
ViessmannVitodens 200WB2-66kWCondensingGas90.1%
ViessmannVitodens 200WB2-11kWCondensingGas90.0%
ViessmannVitodens 200WB2ACondensingGas90.1%
ViessmannVitodens 200 CombiWB2-24kWCondensingGas90.1%
ViessmannVitodens 200 CombiWB2ACondensingGas90.0%
ViessmannVitodens 200-W WB2B30kW System BoilerCondensingGas90.8%
ViessmannVitodens 200-W WB2B30kW Combi boilerCondensingGas90.7%
ViessmannVitodens 200-W WB2B26 kW System boilerCondensingGas90.7%
ViessmannVitodens 200-W WB2B26kW Combi BoilerCondensingGas90.6%
ViessmannVitodens 200-W WB2B35kW System BoilerCondensingGas90.5%
ViessmannVitodens 200-W WB2B35kW Combi boilerCondensingGas90.4%
ViessmannVitodens 200-W WB2B19kW System boilerCondensingGas90.2%
ViessmannVitodens 200-W WB2B26kW System boilerCondensingLPG92.5%
ViessmannVitodens 200-W WB2B35kW Combi boilerCondensingLPG92.5%
ViessmannVitodens 200-W WB2B30 kW System BoilerCondensingLPG92.5%
ViessmannVitodens 200-W WB2B30kW Combi boilerCondensingLPG92.4%
ViessmannVitodens 200-W WB2B26 kW Combi BoilerCondensingLPG92.4%
ViessmannVitodens 200-W WB2B35kW System BoilerCondensingLPG92.3%
ViessmannVitodens 200-W WB2B19kW System boilerCondensingLPG91.9%
ViessmannVitodens 200W WB2C30kW SystemCondensingGas90.8%
ViessmannVitodens 200W WB2C26kW SystemCondensingGas90.7%
ViessmannVitodens 200W WB2C30kW CombiCondensingGas90.7%
ViessmannVitodens 200W WB2C26kW CombiCondensingGas90.6%
ViessmannVitodens 200W WB2C35kW SystemCondensingGas90.5%
ViessmannVitodens 200W WB2C35kW CombiCondensingGas90.4%
ViessmannVitodens 200W WB2C19kW SystemCondensingGas90.2%
ViessmannVitodens 200W WB2C30kW SystemCondensingLPG92.5%
ViessmannVitodens 200W WB2C26kW SystemCondensingLPG92.5%
ViessmannVitodens 200W WB2C26kW CombiCondensingLPG92.4%
ViessmannVitodens 200W WB2C30kW CombiCondensingLPG92.4%
ViessmannVitodens 200W WB2C35kW SystemCondensingLPG92.3%
ViessmannVitodens 200W WB2C35kW CombiCondensingLPG92.2%
ViessmannVitodens 200W WB2C19kW SystemCondensingLPG91.9%
ViessmannVitodens 222F FS2B26kW Combi with StoreCondensingGas91.0%
ViessmannVitodens 222F FS2B35kW Combi with StoreCondensingGas90.8%
ViessmannVitodens 222F FS2B19kW Combi with StoreCondensingGas90.5%
ViessmannVitodens 222F FS2B26kW Combi with StoreCondensingLPG92.8%
ViessmannVitodens 222F FS2B35kW Combi with StoreCondensingLPG92.6%
ViessmannVitodens 222F FS2B19kW Combi with StoreCondensingLPG92.2%
ViessmannVitodens 242F FB2B26kW Combi with StoreCondensingGas91.0%
ViessmannVitodens 242F FB2B19kW Combi with StoreCondensingGas90.5%
ViessmannVitodens 242F FB2B26kW Combi with StoreCondensingLPG92.8%
ViessmannVitodens 242F FB2B19kW Combi with StoreCondensingLPG92.2%
ViessmannVitodens 300WB3A - 32kWCondensingGas90.4%
ViessmannVitodens 300WB3A - 44kWCondensingGas90.2%
ViessmannVitodens 300WB3A - 24kWCondensingGas90.2%
ViessmannVitodens 300WB3A - 66kWCondensingGas90.1%
ViessmannVitodens 300 CombiWB3A - 24kWCondensingGas90.1%
ViessmannVitodens 333CondensingGas90.4%
ViessmannVitodens 333WS3ACondensingGas90.1%
ViessmannVitodens 333CondensingLPG92.2%
ViessmannVitodens 343FCondensingGas90.4%
ViessmannVitodens 343FCondensingLPG92.4%
ViessmannVitopend 100 CombiWH1-24kWNon-CondensingGas75.3%

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.