[Goat Blower]

If you've already got 220V out there, I'd go that way. I put in a big ass natural gas commercial heater in mine and it'll heat my 3-car in under 20 minutes, but running the gas line and exhaust was a pain in the ass. Just don't go with the cheapest, you end up spending more in the long run, it's better to oversize than undersize.