I use one of these .....
I also made a upright barrel stove from another 55 gallon drum to use in my "BTU room",a 4x10 office space I use as a storage area for my motors manuals and to relax in,watch TV,read up on service instructions..it takes up much less room than a horizontal stove,and I made it like a Tempwood stove,which has pipes inserted thru the top to let incoming air in,I put 3 pipes in triangle fashion and it works very well..
I have 2 torpedo heaters,a small 55,000 btu one and a big 110,000 btu,but I cant use them much due to the fumes,they set off my asthma and I start gagging..the smaller one works well,but last time I used the big one it kept crapping out after it had run a few minutes and blowing dense white smoke out (like my 6.2 after a cold start

),I think the igniter is failing,I cleaned all the fuel system and tank out twice and no rust or other crap was in it anywhere.
I probably will just scrap it seeing I dont like using it and also feel its a waste of money ,since it may not cure the issue..It was given to me ,so I'm not out anything by getting rid of it..it guzzles fuel fast too,the smaller one is much more efficient and heats the garage well enough--I use that to get the garage warm while the wood stove is getting going..then just turn it off and use the stove..
I had a propane torpedo heater,that thing was useless too---it would only run about 10 minutes,then frost up and the flame would blow out--but propane kept right on escaping into the room!..it also created a lot of condensation on the metal arches of the quonset and would start dripping..
I was told a bigger tank like a 100 lb one would solve the frosting up problem,but I decided to sell it --propane isn't cheap and its a hassle getting a big tank refilled ..the tanks aren't cheap either..
Also had one of those propane heaters that looks like a trash can given to me--I tried using it with a gas grille 20 lb bottle,it wasn't enough to feed it--then I read the label on it,it said it "requires THREE 100 lb tanks connected in series to properly run it--that's going to be put out at the curb with a "free" sign on it..
I don't like wasting money on fuel when I have almost 2 acres of woods with a lot of downed or dead standing trees I can burn--can get as many free pallets I want locally too..the wood stoves can be a pain,they heat up the place slowly,and you must keep an eye on them and put in more wood before the fire dies down too much,but the heat is fantastic..
They could be a hazard if any fuel or oil spills happen though,but I haven't had any troubles so far,I'm pretty careful,and a torpedo heater is probably even more dangerous,really..