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Ralph Mowery

In article ,
says...

I am putting our old home furnace in my pole barn. It is an 85,000 BTU set to use propane. Because it would be hard to transport bigger propane cylinders, would it be possible to hook up a couple of 20 lbs tanks? I would be heating the barn only on the days I am out there, not continuously.

Thanks for the input

Off hand I would say no. The propane has to boil off the liquid to make
gas. The 20 pound cylinders probably can not boill off enough for a
furnace that large, especially if it is already cold outside. Then too
as the cylinders start to boil the gas off they get cold and compound
the problem.