Aaron I ran a test on mine yesterday because there was a lot of complaining about the carbon monolide problem here. I ran mine for 9 hours on low outside temp 40d.
I put in 2 monitors one has a digital readout they never did kick off and I never smelled anything the digital meter stayed at zero! Usually an unvented heater will throw off a slightly funny smell.
Last Feb we took our A-Liner out and used the wave 3 lows in the 20s big winds chilly but not cold. I have mine set up with a quick disconnect so I can run our
propane cook stove if need be. We are big time boondockers you can usually find us at the Walmarts free parking not campin!
When we got back I took the tank to get refilled he could only get 2 gals in it. Those heaters run cheap and efficiently.
I have heard of people running the wave 8 now I think that thing could suck up some gas!
bob