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Posted by HeatPro on December 12, 2007 at 09:52:05:
In Reply to: Re: steam boiler sizing posted by steve on December 11, 2007 at 23:42:12:
: By your argument old radiators are inefficient too. The boiler is in house so the heat is going somewhere. Zoning and variable water temperature seem to be the largest benefits to hydronics.
++ No, radiators are 100% efficient, 100% of the heat that goes into their surface in the steam comes out. It is the concept of one of the purposes of zoning you are missing - that you heat areas that need heat and reduce the heat where not needed to save fuel costs. Those huge pipes in the basement heating where people are not is a LARGE cost - that is what the 33% added for piping and pickup is about. 33% for no other purpose than to heat pipes instead of people is a LARGE waste.
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