Mine works reliably at 9,100 but doesn't at 10,000 in an enclosed space. It helps if the unit gets fresh air, but that can defeat the purpose. A battery powered fan behind it pulling in fresh air through a crack in the door also helps. My cousin using the same system (buddy heater with 20lb tank) was less reliable at 9100 until he was giving it fresh air. I think the low oxygen cutoff sensor must vary slightly between units.Any issues with it at elevation? I’ve got one but I’ve heard mixed reviews once you get over 8000’ and I’ll be around 9500 this fall?
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