ENERGY STAR qualified boilers have annual fuel utilization efficiency (AFUE) ratings of 85% or greater. AFUE is the measure of heating equipment efficiency. They achieve greater efficiency with features, including:
- Electronic ignition, which eliminates the need to have the pilot light burning all the time
- New combustion technologies that extract more heat from the same amount of fuel
- Sealed combustion that uses outside air to fuel the burner, reducing drafts and improving safety
|
|