Hi,
just reread your post - is the furnace already dismantled, or does it still work ?
Because it may well be possible that there is something (heat exchanger) cracked, but the big "boom" when igniting usually points to a too late ignition - fuel build up, not sufficient spark/delayed iginition and ... boom - you get the idea.
But this has nothing to do with the heat exchanger itself - the latter one will only lead to losing a bit of water/pressure in a few days.
And there is no imminent danger of a CO2 build-up.
Greetings,
Catfish
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