My apologies, I dropped the ball. When I did some of this testing it was before work and I couldn't tell if it was a thick canister of jacketed. Like a dummy and in a hurry I was wondering why it took so long to heat up. Well I took it into work to examine more closely and it has what appears to be an air jacket around it. So I'm skeptic that in a fire at lower temperatures if it would get hot enough to boil water, especially in winter. So I would not recommend it for use in this case. If you just want it for a water bottle then it would do at that but that's about it for it. So I guess the search goes on.