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Posted by HeatPro on May 05, 2006 at 20:27:14:
In Reply to: Re: wood coal residential posted by Bill Yates on May 04, 2006 at 09:46:50:
As steam boilers are inherently inefficient due to having to reach 212F or more before making heat on EVERY cycle, manufacturers have a hard time coming up with enough efficiency to reach 78% minimum AFUE ratings, especially with coal which implies fly-ash, so coal boilers tend to be larger for commercial sizes.
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