Posted by Roger Tomfohrde on January 29, 2018 at 15:57:05 from (24.118.172.93):
In Reply to: Propane boiler ? posted by 550Doug on January 29, 2018 at 15:06:00:
-40 ? seems like a unusually low temp. The manuals for sizing of heat loads are based on the area heated and the insulation of the structure. Boilers using higher water temps than 125 degrees F will not condense. So a load calculation would need to be done in any case.. It is all about how many BTU's need to be used. Oil boilers typically run very high because of the btu content in the oil is around 165,000 per gallon. Propane is 92000 per Gal and natural is less. Usually they are sized so there are a couple days where the boiler will run continuously at the low temp. Otherwise they are drastically over sized In Minnesota. A load calculation by a reputable person will show if it can be done. So in short maybe and maybe not.
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