Looks as if that Atwood Excaliber isn't available any longer. Is it worth finding a 2 stage furnace? It seems like many (all?) of the Dometic models are only single stage.
I'm not opposed to a rebuild, but thought I would replace with new if it was going to be several hundred dollars in parts.
Would any of the diesel heaters on the market work?
Don't rule out looking at salvage yards for parts or a complete unit.It's possible that an almost "new" unit could be found.Speculation at best here....