08/31/2026
Do you know what AFUE is? 🤔
The annual fuel utilization efficiency (AFUE) is the percentage of fuel that produces heat for your comfort versus heat lost up the chimney.
Currently, ENERGY STAR® gas boilers must have an AFUE of at least 90%, while ENERGY STAR® oil boilers must have an AFUE of at least 87%. An electric boiler with no chimney losses has an AFUE rating of 100%.
Older, low-efficiency boilers can have an AFUE as low as 55%. That means you could potentially cut your heating bill in half by switching out an old, low-efficiency boiler for a new, high-efficiency unit.
Want to improve your boiler's efficiency? 🤔
https://aaanorthstar.com/boilers/