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So my shop has 2 heaters!

The one referenced in this thread I haven't tried the air yet - but I do think we're dealing with a gas valve issue.

My second heater is also acting up, I suspect it has an issue with plugging in the gas line, as it has a rather yellow flame, although judging from the rust up under the heater, I think it is the OEM one with the shop.

So I am almost thinking of installing two new heaters.