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Posted by Harold hydronicnetwork.net on March 26, 2004 at 07:31:28:
In Reply to: Re: switch to hot water system? one mor question . . posted by clem on March 25, 2004 at 09:25:46:
It would be best to install a new boiler made for the purpose. An old boiler might not be as efficient as a new one; so keeping an old, inefficient boiler can be an immediate saving and a long-term waste.
A heat exchanger requires heat transfer from a warmer water to a lesser temperature, so the boiler would have to be kept near steam temperature of 200F to supply heat for loops at 180F. This increases wastage of heat. It is of little significance now for the one floor, as the upstairs has to steam at over 212F to heat them; but later with the whole house running off the exchanger, it is wasteful.
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