we still have them but most are diesel with electric fans. Went to a tented site that was running one and it was a small slab on grade but just a few minutes into the inspection I had that killer headache. I own one that I have kept for years because I have had to tent over a vehicle or two over the years to get them started at 40 below. I used to plow with my four wheeler and a couple of years ago it was frozen in about 4" of ice. I pulled the heater out but had to repair it as the fuel lines have a tendency to rot out.I remember the days they would use kerosene fired salamanders inside buildings under construction.
A couple years ago I saw some tamales being warmed up by one of those salamander heaters, It works!
They smelled great!Were they good??