Garage heat

I have a Kero-Sun 23.000 BTU Kerosene heaterView attachment 1715651470 in my carport / work shop. A 2 car, open carport. I have it closed of with a tarp hung like a curtain. The heater keeps the space comfortable. No fumes. If you have trouble with allergies or you think you have fumes, you can burn pure mineral sprits. More expensive than Kerosene, but burns real clean. I used to sell kerosene heaters in, of all places, Miami Florida for a hardware store. "The Aladdin Blue Flame." The store owner always recommended Mineral Sprits.

You guys know that they make ventless gas and propane heaters that hang on a wall or set On the floor w/ a leg attachment ? I have a natural gas one mounted about 18'' off the floor , my garage (16x38) is enclosed w/ only 3/4'' foil faced foam board insulation , it doesnt retaiin heat real well ,and if I GET IT OVER 60 DEGRESS , ITS STARTS GETTING TOO WARM TO WORK COMFORTABLY IN ANYWAY.
A guy could install one and use a small/charcoaler type propane tank setting just far enough away from it to be safe , and have the same thing , all plbg. inside .
Maybe even a heat sheild between them , if that close ---propane is more explosive than nat. gas -be careful , for sure no leaks!
Might set the tank outside w/ an enclosed cover for it , using a short run of black or copper piping to get inside ---------- easy peasy .