Steve Wilde
01-28-2016, 8:34 PM
I have an old water heater that is slowly dying, and in need of replacement. The old water heater has a 3" vent, and the new will have a 4" vent. The vent goes into a common flue that the water heater and two furnaces all vent through, and goes all the way to the roof, two stories up. How would you go about enlarging the hole where the water heater vent attaches? Replacing the water heater is easy, but the flue has me a bit baffled. One idea is to get an oops arbor for my hole saw and use a 3" saw on the inner arbor, and a 4" on the outer arbor and drill it out, but I'm not sure the flue is rigid enough to do that. Any Ideas?
i added the photo, not sure why it's sideways, but the upper one is the water heater...
i added the photo, not sure why it's sideways, but the upper one is the water heater...