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Posted by HeatPro on November 11, 2008 at 21:20:45:
In Reply to: Lochinvar Knight posted by Ken on November 11, 2008 at 18:48:57:
The current boiler is a Laars Minitherm 185K btu spec'd a Lochinvar Knight condensing boiler. I have read on various forums that the newer condensing boilers can save 30-40% on fuel useage. If so, that might make pretty good sense.
It would make less sense to you knowing that the AFUE rating on the old boiler was 80% and the condensing boiler can do 94%.
14% more isn't 30-40%, so double your payback period. Salesmen often use overinflated impressive wheeze numbers left over from 1980 when boilers were 65% AFUE and condensing boilers of today do 94%.
Nowadays new boilers are at least 84% AFUE, so getting a condensing boiler that does 94% instead can save 10%. Salesmen need to get a new wheeze to match reality in these times.
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