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Lets set the record straight; Propane stops boiling at -44 deg. F
This is not an opinion it is fact. anything above -44 deg F and your propane system will work. Remember your physics lesson, boiling liquid produces a cooling effect so the liquid (propane) in the bottle will be cooler than its surroundings. When you use propane the liquid in the tank boils off into a gas. Here in lies the variable, the larger the discharge (discharge from a propane tank) the greater the cooling effect. So if your tank is enclosed in a vented enclosure it is difficult to tell at what ambient temperature the internal liquid will reach -44 deg F. Most heaters will cycle and the off cycle allows for warming of the tank.
There are other things that will restrict the flow, Moisture in the tank is one.
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