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Posted by Heatpro on December 29, 2005 at 13:09:25:
In Reply to: Re: Condensing boiler - Pros & Cons posted by Ron on December 29, 2005 at 11:26:44:
"AFUE was designed for warm air furnaces."
That's right. The AFUE test takes an importance of the time it takes to cool down the boiler mass. The lower the mass, the faster the cool-down, so the DOE AFUE procedure favors lightweight, either sheetmetal furnaces or copper-tube boilers. The DOE testing was another foot-shooting spree by the US boiler industry. The new IBR 2000 low-temp test at 110F is a step toward improving their picture - but too late.
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