Grant - 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.

Grant Boilers

GrantCombi90 Mk IINon-CondensingOil82.9%
GrantCombi70 Mk IINon-CondensingOil82.5%
GrantCombi70 V3Non-CondensingOil82.5%
GrantCombi 90 V3Non-CondensingOil82.7%
GrantCombi MaxNon-CondensingOil82.2%
GrantEuroflameKitchen / Utility 70-90Non-CondensingOil85.3%
GrantEuroflameKitchen / Utility 50-70Non-CondensingOil85.3%
GrantEuroflameOutdoor Module 50-70Non-CondensingOil85.3%
GrantEuroflameSystem 50-90Non-CondensingOil85.3%
GrantEuroflameBoilerhouse 50-70Non-CondensingOil85.3%
GrantEuroflameBoilerhouse 70-90Non-CondensingOil85.3%
GrantEuroflameOutdoor Module 70-90Non-CondensingOil85.3%
GrantEuroflameKitchen/Utility 90-120Non-CondensingOil85.2%
GrantEuroflame90-120 OutdoorNon-CondensingOil85.2%
GrantEuroflame90-120 System Kitchen UtilityNon-CondensingOil85.2%
GrantEuroflame90-120 BoilerhouseNon-CondensingOil85.2%
GrantEuroflame CondensingBoilerhouse 50-70CondensingOil93.0%
GrantEuroflame CondensingIndoor 50-70CondensingOil93.0%
GrantEuroflame CondensingModule 50-70CondensingOil93.0%
GrantEuroflame CondensingModule 70-90CondensingOil92.4%
GrantEuroflame CondensingBoilerhouse 70-90CondensingOil92.4%
GrantEuroflame CondensingIndoor 70-90CondensingOil92.4%
GrantEuroflame CondensingModule 90-120CondensingOil92.1%
GrantEuroflame CondensingBoilerhouse 90-120CondensingOil92.1%
GrantEuroflame CondensingIndoor 90-120CondensingOil92.1%
GrantMultipassBoilerhouse 110-140Non-CondensingOil85.7%
GrantMultipassBoilerhouse 70-90Non-CondensingOil85.7%
GrantMultipassKitchen 70-90Non-CondensingOil85.7%
GrantMultipassBoilerhouse 90-110Non-CondensingOil85.7%
GrantMultipassSystem 50-70Non-CondensingOil85.7%
GrantMultipassOutdoor 110-140Non-CondensingOil85.7%
GrantMultipassSystem 110-140Non-CondensingOil85.7%
GrantMultipassSystem 90-110Non-CondensingOil85.7%
GrantMultipassSystem 70-90Non-CondensingOil85.7%
GrantMultipassBoilerhouse 140-160Non-CondensingOil85.7%
GrantMultipassKitchen 160-200Non-CondensingOil85.7%
GrantMultipassKitchen 50-70Non-CondensingOil85.7%
GrantMultipassKitchen 140-160Non-CondensingOil85.7%
GrantMultipassKitchen 90-110Non-CondensingOil85.7%
GrantMultipassKitchen 110-140Non-CondensingOil85.7%
GrantMultipassBoilerhouse 160-200Non-CondensingOil85.7%
GrantOutdoorCombi Mk IINon-CondensingOil82.9%
GrantOutdoorCombi 90 V3Non-CondensingOil82.7%
GrantOutdoorCombi MaxNon-CondensingOil82.2%
GrantVortex26-36-S Utility System BoilerCondensingOil97.0%
GrantVortex26-36 Utility BoilerCondensingOil97.0%
GrantVortexOutdoor Module 26-36CondensingOil97%
GrantVortex26 SCondensingOil95.0%
GrantVortex15-26 Kitchen BoilerCondensingOil95.0%
GrantVortexUtility System 15-26SCondensingOil95.0%
GrantVortex15-26S Kitchen BoilerCondensingOil95.0%
GrantVortexUtility 15-26CondensingOil95.0%
GrantVortexOutdoor Module 15-26CondensingOil95.0%
GrantVortex20 SCondensingOil94.6%
GrantVortexOutdoor Condensing Combi 36CondensingOil94.2%
GrantVortexUtility 46-58CondensingOil94.1%
GrantVortex15 SCondensingOil94.0%
GrantVortexUtility 58-70CondensingOil93.6%
GrantVortexOutdoor Module 36-46CondensingOil92.6%
GrantVortexUtility 36-46CondensingOil92.6%
GrantVortexUtility System 36-46SCondensingOil92.6%
GrantVortexOutdoor Condensing Combi 26CondensingOil92.2%
GrantVortex 20G BoilerhouseCondensingOil96.1%
GrantVortex 20G Boilerhouse SystemCondensingOil96.1%
GrantVortex 20G Outdoor ModuleCondensingOil96.1%
GrantVortex 20G Outdoor Module SystemCondensingOil96.1%
GrantVortex 20G UtilityCondensingOil96.1%
GrantVortex 20G Utility SystemCondensingOil96.1%
GrantVortex 26-36 BoilerhouseCondensingOil97%
GrantVortex 26-36 Boilerhouse SystemCondensingOil97.2%
GrantVortex 26-36 Outdoor Module SystemCondensingOil97%
GrantVortex 30G BoilerhouseCondensingOil95.6%
GrantVortex 30G Boilerhouse SystemCondensingOil95.6%
GrantVortex 30G Outdoor ModuleCondensingOil95.6%
GrantVortex 30G Outdoor Module SystemCondensingOil95.6%
GrantVortex 30G UtilityCondensingOil95.6%
GrantVortex 30G Utility SystemCondensingOil95.6%
GrantVortex CondensingCombi 36CondensingOil94.2%
GrantVortex CondensingCombi 26CondensingOil92.2%
GrantVortex CondensingCombi 21CondensingOil90.2%
GrantVortex EcoUtility 15-21CondensingOil93.0%
GrantVortex EcoExternal 15-21CondensingOil93.0%
GrantVortex EcoExternal 21-26CondensingOil92.4%
GrantVortex EcoUtility 21-26CondensingOil92.4%
GrantVortex EcoUtility 26-35CondensingOil92.1%
GrantVortex EcoExternal 26-35CondensingOil92.1%
GrantVortex Eco Wall Hung 12-16CondensingOil94.9%
GrantVortex Eco Wall Hung 16-21CondensingOil93.8%
GrantVortex Eco Wall Hung External 12-16CondensingOil94.9%
GrantVortex Eco Wall Hung External 16-21CondensingOil93.8%
GrantVortex Eco Wall Hung External System 12-16CondensingOil94.9%
GrantVortex Eco Wall Hung External System 16-21CondensingOil93.8%
GrantVortex Eco Wall Hung System 12-16CondensingOil94.9%
GrantVortex Eco Wall Hung System 16-21CondensingOil93.8%
GrantVortex OutdoorCombi 21CondensingOil90.2%
GrantVortex Outdoor Module 15-21CondensingOil93%
GrantVortex Pro Boilerhouse 36-46CondensingOil92.6%
GrantVortex Pro Boilerhouse 46-58CondensingOil94.1%
GrantVortex Pro Boilerhouse 58-70CondensingOil93.6%
GrantVortex Pro External 46-58CondensingOil94.1%
GrantVortex Pro External 58-70CondensingOil93.6%
GrantVortex Utility 15-21CondensingOil93%

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.