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Slickwillie,
Yes I have the Mr. Heater Big Buddy model. You are correct that it is as most blue flame brick style heaters have the oxygen depletion system installed. They are also close to 100% efficient. Both the Blue Flame and Mr. heater brand heaters have a automatic shutoff if the heater is tipped. I checked it and it works. The one down side I have found with the Mr. Heater Big Buddy is that at the higher altitudes (Above 7500 feet) the heater oxygen depletion system kicks in and shuts off. So..... Lets say you are at 6000 feet and you don't have enough fresh oxygen rich air because you only have the window cracked a little. Guess what? So far we haven't had a problem. We're going fly fishing in the Sierras in the spring. We have a wave catalytic heater in the cab over camper. I will take the Mr. Heater to test at higher altitudes. Time will tell. John
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