Troy Wardle
New Member
I am looking to replace my existing 50 gal water heater with an HE tankless condensing water heater. The location is in the basement and there are two 6 inch vents that go to the attic for outside air for the existing old water heater and older furnace (will replace furnace later). I have a clear path to run the HE water heater exhaust to the back of the house and could do the vent as well, but I am wondering if I can do a short run for the fresh air input vent to one of the 6 inch vents that goes to the attic and have it pull outside air from the opening or even just a 12 - 18 inch run straight up to just pull air from the room. Would this work? I'm thinking it would as air would be pulled from the attic and should be sufficient. Your advice would be appreciated.