Thorn EMI Heating - 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.

Thorn EMI Heating Boilers

ModelTypeFuelEfficiency
Thorn EMI HeatingApollo50/80bNon-CondensingGas65%
Thorn EMI HeatingApollo50/80cNon-CondensingGas65%
Thorn EMI HeatingApollo30/50sNon-CondensingGas72%
Thorn EMI HeatingApollo15/30bNon-CondensingGas65%
Thorn EMI HeatingApollo30/50bNon-CondensingGas65%
Thorn EMI HeatingApollo15/30cNon-CondensingGas65%
Thorn EMI HeatingApollo65/80bNon-CondensingGas65%
Thorn EMI HeatingApollo50/65bNon-CondensingGas65%
Thorn EMI HeatingApollo50/65cNon-CondensingGas65%
Thorn EMI HeatingApollo65/80cNon-CondensingGas65%
Thorn EMI HeatingApollo40sNon-CondensingGas72%
Thorn EMI HeatingApollo30sNon-CondensingGas72%
Thorn EMI HeatingApollo50sNon-CondensingGas72%
Thorn EMI HeatingApollo80siNon-CondensingGas72%
Thorn EMI HeatingApollo30siNon-CondensingGas72%
Thorn EMI HeatingApollo50siNon-CondensingGas72%
Thorn EMI HeatingApollo40siNon-CondensingGas72%
Thorn EMI HeatingApollo30bNon-CondensingGas65%
Thorn EMI HeatingApollo30cNon-CondensingGas65%
Thorn EMI HeatingApollo40bNon-CondensingGas65%
Thorn EMI HeatingApollo40cNon-CondensingGas65%
Thorn EMI HeatingApollo50bNon-CondensingGas65%
Thorn EMI HeatingApollo50cNon-CondensingGas65%
Thorn EMI HeatingApollo60bNon-CondensingGas65%
Thorn EMI HeatingApollo60cNon-CondensingGas65%
Thorn EMI HeatingApollo80bNon-CondensingGas65%
Thorn EMI HeatingApollo80cNon-CondensingGas65%
Thorn EMI HeatingApollo60siNon-CondensingGas72%
Thorn EMI HeatingApollo Fanfare30/50siNon-CondensingGas72%
Thorn EMI HeatingApollo Fanfare15/30siNon-CondensingGas72%
Thorn EMI HeatingApollo Fanfare65/80siNon-CondensingGas72%
Thorn EMI HeatingApollo Fanfare15/30sNon-CondensingGas72%
Thorn EMI HeatingApollo Fanfare50/65siNon-CondensingGas72%
Thorn EMI HeatingApollo Fanfare40siNon-CondensingGas72%
Thorn EMI HeatingGeminiwmNon-CondensingGas65%
Thorn EMI HeatingHarcal260Non-CondensingOil65%
Thorn EMI HeatingHousewarmeremodelNon-CondensingGas65%
Thorn EMI HeatingHousewarmerdeluxeNon-CondensingGas65%
Thorn EMI HeatingHousewarmersmodelNon-CondensingGas65%
Thorn EMI HeatingHousewarmersuperNon-CondensingGas65%
Thorn EMI HeatingHousewarmer30/45snugNon-CondensingGas65%
Thorn EMI HeatingHousewarmer30/45extratcNon-CondensingGas65%
Thorn EMI HeatingHousewarmer30/45epicNon-CondensingGas65%
Thorn EMI HeatingHousewarmer30/45economyNon-CondensingGas65%
Thorn EMI HeatingHousewarmer30/45spectacularNon-CondensingGas65%
Thorn EMI HeatingHousewarmer30/45elegantNon-CondensingGas65%
Thorn EMI HeatingHousewarmerspectacularsNon-CondensingGas65%
Thorn EMI HeatingHousewarmerspectaculardeluxeNon-CondensingGas65%
Thorn EMI HeatingHousewarmer30/45superiorNon-CondensingGas65%
Thorn EMI HeatingHousewarmer30/45supremeNon-CondensingGas65%
Thorn EMI HeatingHousewarmer30/45epictcNon-CondensingGas65%
Thorn EMI HeatingHousewarmer30/45sableNon-CondensingGas65%
Thorn EMI HeatingHousewarmereliteNon-CondensingGas65%
Thorn EMI HeatingHousewarmer45Non-CondensingGas65%
Thorn EMI HeatingHousewarmer55Non-CondensingGas65%
Thorn EMI HeatingHousewarmer 230/45sNon-CondensingGas65%
Thorn EMI HeatingHousewarmer 230/45deluxeNon-CondensingGas65%
Thorn EMI HeatingHousewarmer 230/45eNon-CondensingGas65%
Thorn EMI HeatingHousewarmer 230/45eplusNon-CondensingGas65%
Thorn EMI HeatingHousewarmer 230/45superNon-CondensingGas65%
Thorn EMI HeatingHousewarmer Mk230/45extraNon-CondensingGas65%
Thorn EMI HeatingInternational40deluxeNon-CondensingGas65%
Thorn EMI HeatingInternationalm42bfNon-CondensingGas55%
Thorn EMI HeatingInternationalm42cfNon-CondensingGas55%
Thorn EMI HeatingInternationalm54cfNon-CondensingGas55%
Thorn EMI HeatingInternationalm54bfNon-CondensingGas55%
Thorn EMI HeatingMarathon80/100cNon-CondensingGas65%
Thorn EMI HeatingMarathon80/100bNon-CondensingGas65%
Thorn EMI HeatingMarathon56/76cNon-CondensingGas65%
Thorn EMI HeatingMarathon56/76bNon-CondensingGas65%
Thorn EMI HeatingMarathon44/54cNon-CondensingGas65%
Thorn EMI HeatingMarathon44/54bNon-CondensingGas65%
Thorn EMI HeatingMarathon30/42cNon-CondensingGas65%
Thorn EMI HeatingMarathon30/42bNon-CondensingGas65%
Thorn EMI HeatingMarathon700bNon-CondensingGas65%
Thorn EMI HeatingMarathon1000bNon-CondensingGas65%
Thorn EMI HeatingMarathon800cNon-CondensingGas65%
Thorn EMI HeatingMarathon1000cNon-CondensingGas65%
Thorn EMI HeatingMarathon800bNon-CondensingGas65%
Thorn EMI HeatingMarathon1500cNon-CondensingGas65%
Thorn EMI HeatingMarathon400cNon-CondensingGas65%
Thorn EMI HeatingMarathon500bNon-CondensingGas65%
Thorn EMI HeatingMarathon500cNon-CondensingGas65%
Thorn EMI HeatingMarathon600bNon-CondensingGas65%
Thorn EMI HeatingMarathon600cNon-CondensingGas65%
Thorn EMI HeatingMarathon400bNon-CondensingGas65%
Thorn EMI HeatingMarathon700cNon-CondensingGas65%
Thorn EMI HeatingOrion75siNon-CondensingGas68%
Thorn EMI HeatingOrion60bNon-CondensingGas65%
Thorn EMI HeatingOrion50bNon-CondensingGas65%
Thorn EMI HeatingOrion40bNon-CondensingGas65%
Thorn EMI HeatingOrion30bNon-CondensingGas65%
Thorn EMI HeatingOrion Fanfare50siNon-CondensingGas68%
Thorn EMI HeatingOrion Fanfare40siNon-CondensingGas68%
Thorn EMI HeatingOrion Fanfare30siNon-CondensingGas68%
Thorn EMI HeatingOrion Fanfare60siNon-CondensingGas68%
Thorn EMI HeatingThorn Harcal200Non-CondensingOil65%
Thorn EMI HeatingThorn Harcal HavanaNon-CondensingOil65%
Thorn EMI HeatingThorn JanitorODY-3Non-CondensingOil65%
Thorn EMI HeatingThorn JanitorOV-45Non-CondensingOil65%

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.