LP heater question

[nancy]

Greetings -
I got a heater unit that screws onto the top of a propane tank (like a barbeque grill uses); even on 'low' it puts out an impressive amount of heat.
So, I know that people who use natural gas or oil-fueled heaters have to be very cautious in using these around orchids, because even a slight gas leak will cause bud drop in orchids.
Does anybody know if propane would have the same effect? I've been using a little electric box heater when the nights are too cold (and winter has come astoundingly early to balmy south Louisiana). I'd sure like to use this propane heater, but not at the cost of my buds!
Thanks - Nancy