The thing to remember if you're ever in a pinch and need to warm a canister is that the canister should never be hot to the touch. Pay constant enough attention to the canister, and pretty much any work around can be used.
I think that playing it safe is always a good idea. Having said that, just bear in mind that those canisters are designed to be safe at very high temperatures, as I recall, approaching 200 (F) not that I am suggesting anyone try to stray into the safety margins. Too hot to touch is good advice for a working limit.
Hi, Doug,
Yes, my fairly conservative approach is just that, conservative, but it isn't meant to be alarmist. Those canisters are actually pretty safe and aren't some kind of ticking time bomb. When I say "hot," I mean "ouch!" hot. Warm to the touch or even relatively hot but not so hot that you need to draw your (unfrozen!) hand away should be fine.
In the face of hypothermia, I wouldn't hesitate to do what it took to get that canister going.
HJ
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