i would say it would be a common issue as unit firebox
ages heats and cools ..so often
if you cant buy the casing or
find a used unit for sale with a good casing
depending on which material in the casing is made of
if metal or aluminum
welding the crack or a patch repair
may be possible because it is at the top of the unit
if cast iron needs a special pre- heating method of repair
or a new casting made
found this link out of new york area
DVHVAC36
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