Boiler Efficiency Ratings 2025 | ECO4 Government Scheme
Compare boiler efficiency ratings to find out if a replacement boiler could save you money on your energy bills. Check SEDBUK and ErP ratings to make an informed decision about your heating system.
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Most Efficient Boilers
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Fuel
Oil
Type
Conventional
Output
26 - 26
Method
Condensing
Fuel
Oil
Type
Conventional
Output
20 - 20
Method
Condensing
Fuel
Oil
Type
Conventional
Output
20 - 20
Method
Condensing
Fuel
Oil
Type
Conventional
Output
20 - 20
Method
Condensing
Fuel
Oil
Type
Conventional
Output
26 - 26
Method
Condensing
Fuel
Oil
Type
Conventional
Output
26 - 26
Method
Condensing
Understanding Boiler Efficiency
Learn about the different efficiency rating systems and how they affect your energy bills
SEDBUK (Seasonal Efficiency of a Domestic Boiler in the UK) provides a percentage rating showing how much energy is used vs. wasted when heating your home.
The Energy related Products (ErP) Directive requires all boilers to display an energy label from A+++ to G, with A+++ being the most efficient.
Why Boiler Efficiency Matters
Understanding boiler efficiency can help you make informed decisions about your heating system, potentially saving hundreds of pounds annually while reducing your environmental impact.
Lower Energy Bills
More efficient boilers use less fuel to produce the same amount of heat, reducing your monthly energy costs significantly.
Reduced Carbon Footprint
Efficient boilers produce fewer carbon emissions, helping you contribute to environmental protection and meet UK climate targets.
Better Home Comfort
Modern efficient boilers provide more consistent heating and better temperature control throughout your home.
Longer Lifespan
Efficient boilers are typically built with better components and technology, resulting in longer operational life.
Calculate Your Potential Savings
Use our free boiler efficiency calculator to estimate your annual savings and CO₂ reduction. See exactly how much you could save by upgrading to a more efficient boiler.
Compare Boilers Side by Side
Compare different boiler models, efficiency ratings, and specifications to find the perfect boiler for your home. Make an informed decision with our comprehensive comparison tool.
Ready to Upgrade Your Boiler?
Check if you're eligible for a free A-rated boiler through the ECO4 scheme and start saving money on your energy bills today.