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Posted by Pat S on January 28, 2005 at 16:10:54:
In Reply to: Re: Condensing vs Non-Condensing Gas Boilers posted by dave on January 28, 2005 at 14:50:51:
: Well, my 2 cents is that if you are installing outdoor reset, your supply and return temps might be in the condensing zone for most of the heating season. Plus if your original system was oversized- you may get away with running lower water temps anyway.
Thanks - I have realized that I can run the boiler at ~160F unless it is really cold (<0 F).However, it is the HW return temperature that dictates effective condensing heat transfer and as you said, if I can use a boiler that modulates output - based on outside air or inside temp and runtime info - would that provide increased efficiency (aka decreased fuel consumption) without the greater expense of using a condensing boiler? Aren't there products (controls) that can allow DHW priority and boiler setpoint override?