All this chat about cold weather stoves and propane brings back memories of my refrigeration and A/C days. So, unless you are ice boating your M-boats, let me introduce you to the great moderator: good old H2O. Water has great latent heat capacity and can work both as a source and a sink of heat. I used it both ways. When pumping down a unit on a hot day, the recovery tank would get so hot, and thus high pressure, that recovery could take forever. Dropping your tank in a bucket of water would let the heat go quickly to the water, condensing the refrigerant vapor, saving much time. When charging - and this is the relevant part - the liquid charging tank would get so cold from the evaporating gas, just like propane, there wouldn't be enough vapor pressure to charge quickly. Soooo...out with the bucket of water, in goes the tank and provides a nice, very conductive heat source to warm the refrigerant. Propane works just fine above 32 degrees - with a vapor pressure of about 53psi - most burners work at about 11 inches wc, or 1/2psi. Tying a string on your cold tank and dunking it in the lake is a quick way to warm it up. A 1 pound bottle of propane at a continuous 32 degrees can supply roughly 10,000 btu's an hour,or one burner, without losing pressure . If you are cooking a long, or large meal, you might want two bottles - one in the water and one in the stove. As the stove one ices up, switch bottles. It works because it is the Law of Physics, which is only slightly less powerful than the Law of the Sea!