What I did a couple years ago was: HF 9000W gas gen & manual lockout, works fine; 8 hours easy on a full tank.
Accessibility in crappy weather drove location, it's something to figure out.
Electric heat is horribly inefficient; propane or natural gas much better & cheaper.
For some reason the utility co ran NG into our part of the woods, and reimbursed me about 2/3 of the cost of converting from electric to NG heating.
Up here 250-gal tank is the most common for propane, not hard to camouflage or hide if need be.
FWIW I'm heating a 1650SF home (68*), 30x40 shop, and 20x36 shop (both at 45-50*)