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Energy Efficiency Ratings

Gas Boilers

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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). Also consider an EnerGuide for Houses evaluation to discover how to reduce your heating needs.

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 The ENERGY STAR name and the ENERGY STAR symbol are registered trademarks of the United States Environmental Protection Agency and are used with permission.
 Date modified: 2005-12-19Back to topImportant notices