redytorace
ArboristSite Lurker
Are you sure they are exactly the same? Maybe wood is more prone to something like this when it is shut down, than coal is? Therefore their wood units might have small differences to avoid it? Like say a bigger hole? Or something else?
Also I would be pretty leery about the strength of the firebox after many of these episodes. IMO it would take a lot of firebox flex to blow water out the top - it's not likely designed to take any of that. So each one would be working on a weak spot somewhere, making it weaker. Bending till it breaks kind of thing.
I can't see any major difference in design between the two that would cause this. I don't know if wood or coal is more prone to something like this?? My dealer/installer has been burning the same stove for a few years now and also burns wood in his during milder temps. He has never had this happen, and has never heard of if happening before. I'm waiting to hear back from the manufacturer.