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Posted by Robert Sczech on June 02, 2005 at 14:43:28:
In Reply to: Re: Condensing vs Non-Condensing Gas Boilers posted by Pat S on February 01, 2005 at 16:06:19:
: Thanks again! Am I correct in assuming that condensing boilers' efficiency rely on almost (or 100%) HWS circulation in order to maintain 68-70 indoor at lowest possible supply temp? Wouldn't the increase in pump energy consumption negate some, if not all, my fuel savings during the heating season?
This is an excellent question! The answer clearly depends on the size and efficiency of your circulator pump. If it consumes 100 Watts and the system is running for 12 hours a day, then your electricity cost for running the circulator would be roughly $20 for the whole heating season.
I believe the answer to your question regarding the economics of low temperature return systems (in order to achieve the highest efficiency possible) is as follows: Insulate your house to such a degree that you need little heating in the winter. It is possible to insulate your house in such a way, that your heating expense is less than $100 per year.