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The bigger the bottle you have the more propane you can draw before it freezes up. I don't remember the temperature exactly, I think 0*F? but you can only get approx. 40,000btu from a 20lb bottle, but you can get 125-150,000 btu from a 100lb tank at the same temperature.I don't understand this. I've lived in an rv in 0 degrees and never lost my gas furnace due to propane freezing up.
I even had an extension hose hooked to them with them sitting outside on the ground unprotected.
I had 30 pounders.The bigger the bottle you have the more propane you can draw before it freezes up. I don't remember the temperature exactly, I think 0*F? but you can only get approx. 40,000btu from a 20lb bottle, but you can get 125-150,000 btu from a 100lb tank at the same temperature.
Very large propane heaters actually have a pre-heater tube out in front of the burner to run the propane through and pre-heat it so it will vaporize when it actually gets to the burner.