TheDOE’s Annual Fuel Utilization Efficiency (AFUE) rating system is often criticized for failing to measure the true efficiency of hydronic heating systems by omitting combined heat/hot water systems. This article originally appeared in the November 2006 edition of Oil & Energy. A follow-up appears in the May 2019 issue. The U.S. Department of Energy’s (DOE’s) Annual Fuel… https://oilandenergyonline.com/articles/all/afue-misses-mark-boiler-efficiency/
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