Venting Gas Water Heater with Gas Furnace

[system]

Can you vent a gas hot water tank with a gas furnace using the same UL flue?

[jhagarty (Joseph Hagarty, CMI)]

yes
when appropriately designed and rated.

[rstrand (Rick Strand)]

@jhagarty

yes
when appropriately designed and rated.

Very important if either is power vented, forced or induced draft fan.

[belliott (Bob Elliott, 450.0002662)]

In general the smaller btu appliance vents upstream.