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Posted by HeatPro on January 25, 2005 at 12:52:03:
In Reply to: Re: Replacing boiler posted by Pat S on January 25, 2005 at 12:20:39:
Good. the hot water is by an external indirect, so the boiler doesn't have to be up to temperature all the time. You probably will get enough heat if you set the high limit to 200F, as the system was designed at 180F and you won't get there at a high limit setting of 180f, the burner shuts off at 180F and drops to 165F, so you are really only allowing about 170F water when you need 180F. You won't notice a difference in the bill.
Also, moving the indirect heter up to 170f water and using a good mixing valve would give you more water without costing much. If you are worried about tank losses, you can wrap the tank in fiberglass insulation and prevent losses.
However, changing to a new boiler will be the money-saver. Boilers before late 1970 didn't have stack dampers, so were more usually 65% AFUE or less. Just changing to a new boiler would lower your bill 25% a year.