I have one like this....
Vertical kerosene heater.
I've used it to heat my 4 car garage. I have also used a coleman white gas camp stove to put some heat into a double EZ up with walls for a Cub Scout camp trip and it helped significantly so I can't imagine the derosene heater wouldn't do the trick.
18.5", 22.5" OTS
Large BGE (chambersuac's)
The Fiery Furnace (chambersuac's)
Big JT's Smokin' BBQ Competition Team