In the Oct. 6, 2006, Federal Register, the U.S. Department of Energy (DOE) published a proposed rule to amend the federal minimum efficiency standards for residential furnaces and boilers. Though the 59-page document is sometimes unclear and incomplete, it is slated to go into effect in September 2012, less than a year from now. When I surveyed three smart plumbers and three astute manufacturer's reps, none had heard of it....
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