I've used the Mr buddy heater on two trips recently to heat our 6 man tent and couldn't be happier. I have the setup for bulk propane but haven't needed it. Since it hasn't been really cold yet I've had it set up on a 1lb tank and ready to go in case I get cold. At least 3 nights of the past two trips it's been turned on around 3am and left to run. The other nights it was just used to heat up first thing in the morning while getting dressed. I have ran it on high for as long as 4 hours and haven't noticed any odor issues or anything that would make me uneasy. Since my tent is pretty tall and heat rises, I would think it would work even better in your set up.
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