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Posted by HeatPro on August 25, 2007 at 20:34:51:
In Reply to: Boiler Replacement Proposals - What should I do? posted by John on August 25, 2007 at 16:13:43:
:Boiler marketing managers are in a quandry as to how to continue to say that their newer boilers can bring big savings. As you say, you are looking at savings enough per year by spending $7000 to pay for a trip to MacDonalds a few times. Cast iron and steel boilers only go to about 87% AFUE; gaining 5% on a new boiler doesn't cut it for savings.
Your problem is the tankless coil, so installing a new indirect solves that problem and lets you keep the old boiler that functions at 82 %. Indirects aren't that much more efficient. After all, if a tankless coil makes hot water at $400 a year and you save 25%, it's another trip to MacDonald's. The deal is the longevity of a good indirect. Keeping watch on the combustion efficiency of the boiler maintains the fuel savings.