Gauntlet
Forum Supporter
As I understand it, one threat with propane is lack of oxygen. If you have too tight a house, your propane device can burn up all the oxygen and cause asphyxiation. It has the CO hazard, too.
I lived in a home with a propane stove and two propane wall heaters. The stove had a vented hood, and one heater was vented to the outside, while the other heater was one of those vent free radiant wall heaters.
These (ventless) heaters are generally required to have an oxygen depletion switch as a safety.