Boiler Efficiency Calculator 2025 | Calculate Your Savings
Use our free boiler efficiency calculator to estimate your annual savings and CO₂ reduction. Calculate potential savings from upgrading to a more efficient boiler.
Check your boiler manual or energy label
Modern condensing boilers: 90-98%
Average UK home: 12,000-15,000 kWh
* Calculations are estimates based on average energy prices and usage patterns. Actual savings may vary depending on your specific circumstances.
Why Use Our Calculator?
Get accurate estimates of your potential savings and environmental impact when upgrading to a more efficient boiler.
Free Calculator
No registration required - calculate your potential savings instantly.
Accurate Estimates
Based on real UK energy prices and efficiency data.
Environmental Impact
See how much CO₂ you can save with a more efficient boiler.
Government Backed
Learn about free boiler options through the ECO4 scheme.
Discover Popular Boilers
Explore a selection of popular boiler models from various manufacturers
Fuel
Gas
Type
Combi
Output
27.3 - 27.3
Method
Condensing
Fuel
Oil
Type
Conventional
Output
29.3 - 38.1
Method
Non-Condensing
Fuel
LPG
Type
Conventional
Output
25.0 - 25.0
Method
Condensing
Fuel
Gas
Type
Conventional
Output
24 - 24
Method
Condensing
Fuel
LPG
Type
Combi
Output
24 - 24
Method
Condensing
Fuel
Gas
Type
Conventional
Output
21.0 - 21.0
Method
Non-Condensing
Understanding Boiler Efficiency Ratings
Learn about efficiency ratings and typical savings for different boiler types
Excellent efficiency
£300-500+ annually
Good efficiency
£200-400 annually
Average efficiency
£100-300 annually
Poor efficiency
£400-600+ annually
How to Find Your Boiler's Efficiency
Follow these steps to find your current boiler's efficiency rating
Check Your Boiler
Look for an energy label or efficiency rating on your boiler itself
Check Manual
Find your boiler's user manual and look for efficiency specifications
Search Online
Search for your boiler model online to find efficiency ratings
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.