I have a Mr. Heater 80,000 BTU unit as well in my small pole barn. The flu exits through the roof with a cap. It is sensitive as well and goes out and relights in certain windy/rainy conditions. It also doesn't light at all due to the pressure switch in the draft portion when there is snow on the roof sometimes. I have just learned to live with it after 4 years. Not the most reliable deal out there.
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