I can't say I failed when I was testing out my new Mr. Heater Buddy because I was only checking to see if the thing worked.
The reason I can't say it was a failure because I stumbled on this accidentally. It runs on propane, and when I started it up in my living room and left it run, about 15 minutes later I started getting lightheaded and nauseated, and about to pass out. At first I didn't know what was going on, then I realized it was from the CO from the heater. For a small contraption, the thing puts off an enormous amount of CO.