Hi, Ever heard of the Southern Burner Heater? The A-1 model is 25,000 btu's, venter, runs off a thermostat on either natural gas or propane. Neither requires electricity, at least not from the electric company. They operate on a Honeywell 750milivolt (low voltage) gas valve. It is opened by a thermocouple in the pilot burner. If the electricity goes off in the neighborhood you can go sit in your greenhouse to stay warm, lol, I have sold these heaters for over 40 years, they are excellent. Go for the vented ones, I was never able to keep my catts from streaking with the unvented ones, but I had three vented ones in my large greenhouse, 32 x 42 in so calif.
Harry
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