The heater stinks badly enough that I don't want to spend any time around it. I think propane would probably be a lot more dangerous, because it burns cleaner and does not drive a person away with the smell.
I didn't know the fumes could kill plants. It does make them smell a little bit like a city bus.
I would not try ducting the heater if anyone lived adjacent to or near the greenhouse, but I have forty acres of space around me. If I had a fire, it wouldn't be much of a loss of property. I'm about done with mums for the year, so I might not run the heater again until spring.
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