Yes. I bought a 'survivalcat' a few years ago for use in a camper down in virginia while shooting. We camp on site and I keep a permenant 21ft camper down there. There is a gas problem in it so I do not use the furnace.
That being said it's EXTREMELY safe to use. I have used kerosene, propane, and other heaters. It requires only a 1 square inch opening for oxygen (as stated in the manual). I get that much through the misaligned body panels I usually at most give a window a minor crack.
Further, once 'lit' it will not catch fire to things. The catalytic reaction is very safe aside from directly placing something on the heat source, and even then it won't directly ignite most items that aren't flammable in nature.
It's very economical in usage; Generally I can get 1.5 to 2 full nights of usage out of one propane can. By that I mean letting it run 10-12 hour straight per use. So I guess about 20 hours per small propane can. Never timed it per-se.
The downside is that this heater is nominal in output. It was definitely designed for the 'small two person tent' heating situation. In my camper usually I use the partition to close off the bedroom (making about a 6x8ft room) and use the heater to heat that. It does ok. That plus some blankets makes for a relatively comfortable night as long as it's not extremely cold out (below freezing). I will probably pick up a heavier duty heater though I will always keep the survival cat.
I believe if in small enclosed space (like a car forinstance) this is ideally suited due to low danger to surroundings, excellent fuel consumption rate, low cost, and minimal oxygen usage.
_________________________
Owner, Messina's Front Line Survival Gear - visit our website at www.flsgear.com!
Blog: flsgear.wordpress.com
Twitter: twitter.com/flsgear
Facebook:
http://on.fb.me/foPFgx