Those are quite nice…… I have used those in small sheds/garages/etc., and they work well. I also have a stove that I made out of an old oil drum (small one, not 55 gal). I need to get it cleaned up and get some pictures of that going. It would be nice to show you guys so you can decide if something like that would work for you.
Ever try those old military stoves? those are pretty sweet as well. You can heat up a fairly large tent in no time with them.