Does a Mr. Heater work above 7,000 feet?

[waterat]

I have a Mr. Heater big buddy (two bottles) and it works great. I have used it up to 9000 ft with out any problems. The owner manual states it has an oxygen sensor that shuts the unit off when the O2 levels drop too low as a safety. So the higher you go, the more vent and open air the unit needs. I have been on Strawberry at -25 and colder and have never turned it above med. My wife likes it on high but then I'm only wearing a tee-shirt.

That's my 2 cents.
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