I live in Colorado and have used it regularly at high altitudes, even above 10,000 feet.
I did have one scare and it was on my most recent trip which was high altitude just over 10k. Take this with the caveat that it is not hooked up to electricity yet and therefore is not running with the fan. Had the camper fully zipped up and closed. Went to sleep. About 4 hours in, the carbon monoxide detector went off. It said 74 parts per million. Not deadly, but definitely not safe and I assume it would have continued to rise. I turned everything off and vented the camper. I used it again the next night with the camper window slightly vented and the detector never read above 0.
I have noticed I need to clean the window of the heater somewhat regularly due to carbon build-up. I installed this myself so I could have made a mistake but then again, it had never been an issue before. I've probably had it running a total of 20 nights or more. Not sure what is going on and I am a bit gun shy with it now. Definitely going to vent until I can experiment by just letting it run when I'm not in it.
I think I'll be able to debug the issue. It is 100% worth it though. I love it and it makes the camper very comfortable.
Thanks a lot for the intel! I'm also in CO (live at 9k feet in summit county) and while I don't forsee any super long trips in the dead of winter, it would be nice to get out for some quick nights to backcountry ski with heat which it sounds like would be totally feasible and still easier to deal with than a diesel heater or something of the sort despite being a bit more expensive.
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