How do you heat your distilling space?

[Opdog]

I ferment and distill in my unheated and mostly uninsulated garage. I’m looking into safe ways to heat it so that it’s more comfortable for me and my yeast this winter.

For context my garage is 3 stalls plus a workshop space so whatever solution I come up with needs to be big enough to heat the whole place. It doesn’t have to be T-shirt warm but in the 55-65 degree range when it is 20 degrees outside.

I think the most cost effective solution would be to install a natural gas heater but I’m concerned about the open flame.
My still is pretty solid and I run it responsibly but I live in fear that I will spring a leak somewhere. It have the same concerns about propane or kerosene.

The 10,000w electric heaters I have looked at seem have cheap wiring that doesn’t last. So I’m at a loss as to what to do and am wondering how others have dealt with this.