Today I was working in an unheated building. It was a "round house". House set up by the beach, along the edge of a lake. Designed as a summer home for the waterfront director of a camp.
Masonry structure, cinder block wall. Probably 20 foot diameter, about 9 foot ceiling. It was 37F outdoors, and there was a thermometer indoors, said it was 40F.
I lit up a one burner camp stove, Coleman $20 unit from Walmart. I could barely feel any difference, in the indoor temp. probably 4,000 or 5,000 bTU. After a while, the tank got frosty, and the flame went down. I heated the tank with a propane torch, and the flame went back up for a few minutes.
After a while, the camp got us a "milk house" heater, and we plugged that in. 1500 watts. Which helped a little. By the time I left, it was 50F indoors.
What I'd like, some kind of "weed burner" to burn a lot of propane in a hurry. Raise the temp from 40 to 60 would be really nice.
It should work on a 16 ounce propane bottle. It's OK to invert the bottle, to feed liquid propane to the burner. Small enough to carry in the van with the rest of my tools. Should be relatively safe, if supervised by an adult. Doesn't necessarily have to be OSHA approved. It's just for occasional use. Any ideas? Weed burner, maybe?