A boiler's energy efficiency performance over a heating season is called the Annual Fuel Utilization Efficiency (AFUE). This AFUE is expressed as a percentage. The higher the percentage, the more efficient the boiler.
ENERGY STAR qualified boilers have an AFUE of 85 percent or more.
Many factors affect your home-heating needs, so have a heating-load calculation performed to properly size your boiler (heating capacity).
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