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Posted by Grinch on June 15, 2009 at 19:03:41:
In Reply to: Re: Boiler for a small heat load posted by HeatPro on June 15, 2009 at 09:56:05:
: Add more baseboard to have the system average water temp kept below 140F and you can use a condensing boiler to gain the maximum fuel savings.
Keeping water temperature below 140 on the coldest days would mean installing 14 to 20 feet of baseboard in several rooms or using (hideously expensive) radiators. In order to keep some usable wall area and keep the budget intact, I'd need to push the water temperature to 150+ during the worst few weeks of winter.
How much of an efficiency hit will I take from pushing a mod/con out of condensing mode? Is it enough of an issue that I should be looking at mod/non condensing equipment (e.g. Takagi stuff) instead?
Do you have any views on which boilers are best at this sizing point?
Thanks.