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One additional consideration at -20 below and colder is that as propane evaporates from the tank during heavy use, it cools the tank. You can reach a point at these temps where the liquid propane will not evaporate and remains liquid. Of course, at this point anything using propane stops with no pressure. The smaller the tank, the more this is applicable. The short term solution is to use glowing hot (no flame) charcoal brickettes in a small metal grill below the tank. Needless to say, this requires constant monitoring. The point is that you cannot totally depend upon any one system being reliable.
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