Posted by Roger Tomfohrde on January 30, 2018 at 07:20:44 from (167.177.39.9):
In Reply to: Re: Propane boiler ? posted by Bob on January 29, 2018 at 18:12:03:
As to over 125 degrees the moisture no longer condenses and it goes out the exhaust turning a 90 percent eff. boiler into a 80 percent because the heat is not recovered in the heat exchanger, so to do what you are suggesting you have to add on to a normal boiler(of course I have been out of the business for ten years and things can change). Yes my mind is operating on some very old data, sorry, 138000 is some what better but you would still need to check the vendor. Nat gas is measured by Therms which is in cubic feet. Roughly a 1000 btu. per cu foot whereas propane is 2500 for the same volume. You can compress nat. gas to get gallons and there is some heavy equip in MN that use it, and there are places to sell it for use but I do not know the btu. content of that;-)My only point I was trying to make is oil usually is used where OAT temps are colder, which is a regional thing.
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