thats the trouble both will run at the same time occasionally.
plus have you ever noticed a hot water tanks chimey is smaller than a
the device BTU should be sized in regards to the chimney.
to get good draft the chimney must heat up. that takes a long time
with a too large chimney
but a furnace on a too small chimney may not exhaust well.
I asked a lot about this after nearly dying after carbon monoxide
the chimney cap cracked allowing rain water to get between ceramic
liner and bricks, freezing weather expanded the trapped water the flue
liner fell in and we all got ill. could of died if a buddy, a
volunteer fireman hadnt visited, stayed a while and said lets check
the flues. he got it too.
a very close thing
I'm told it is not just flue gasses, but the potential for some unburned gas
too, that could be ignited by the other appliance. Seems it would be rare
though. I do know that many homes wee built for many years with both heater
and water heater in the same flue.
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