I went through all the heaters. my latest is a diesel vehicle heater. You do need to exhaust it outside. Also need a 12volt power source> I used an old battery with a trickle charger. I can get my detached, semi insulated garage warm enough. About a half gallon every 4 hours. Totally recommend. I recommend the split more. If I had a few bucks that would be my choice.


https://www.amazon.com/VEVOR-8KW-Die...st_slp_dp&th=1