Anyone know anything about these: country hearth model 30A help

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I have a friend that has one of these  country hearth model 30A I have no idea where he bought it. Mabye homedepot. Does anyone know if these are good or have known problems? He had a crack he had to weld because it was sucking air, he fixed it, but now its sucking air someplace else, all the seals are good, the crack might be under the outer tin cover i guess.

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Also, I believe this is the boiler, I remember it being red....

https://hvacdirect.com/us-stove-30a-coal-furnace.html