I have this beast hanging on my 28’ x 36’ garage. But without the insulation complete it works hard. I yanked it out of the storage room of a package store around 25 years ago. Messed with it and unwired a couple of the heat elements to get the total draw down to around 23 amps so that I could run it on a 30a 2 pole breaker in my house, its been pumping out heat ever since. The fan motor is 208v but not 3 phase so that’s how it works in my house.