chimney size question
Replacing a 7610-859 with a 7956C856. Will my old chimney / exhaust pipe work on the new heater ? The vent gas outlet size looks about 5 inches on both and the bigger fresh air inlet size looks about 8 inches on both. Planning on doing this today and hoping I can reuse the chimney / roof jack and not have to replace it.
Got the heater changed out today, finally. Still on it's first cycle right now but is heating good. I re-used my old chimney. The center pipe was still round and in good shape and fit good and snug on the exhaust riser on the heater. The outer pipe was a little bent out of round - was already that way. Old heater had a piece of metal flashing wrapped around the outer pipe and taped with hi-temp aluminum tape to the top of the heater and the flashing wrap so I did the same but I took better care to make sure it was sealed good all the way around top and bottom. So far so good.
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