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venting-upgrade gas heater to high efficiency
I've been considering replacing my older gas heater with a high efficiency unit and since my furnace has stopped igniting, no time like the present. I also purchased a tankless gas water heater that I've been waiting to install.
The old furnace and water heater are in a closet by themselves and share a roughly 40 year old block chimney (house is about that old) My question is can I vent these both into that Chimney or not?