||01-18-2010 02:59 PM
Hot Water Heater Venting...need suggestions
Our natural gas hot water heater is about to lose the chimney through which it passively vents as the chimney needs to be removed. Due to a planned replumbing project, I can move the water heater away from the "central" location in our basement and toward an outside wall.
We do not want to go to the expense of purchasing a power vented water heater, but would prefer to passively vent through an exterior basement vent.
The foundation walls are brick; no combustibles in wall that the exhaust pipe would encounter. There are however a number of windows in the two rooms above where the hot water heater needs to be located. One concern here are exhaust gases finding their way into the house via an open window. The second concern is "I don't wanna look through my kitchen window and see some ugly-azz galvanized exhaust stack".
According to the water heater install instructions and local code, a 1/4" per foot grade for the exhaust pipe is called for. OK...so can I do that for 8 horizontal feet (making for something over a 2" rise), vent out of the brick foundation wall, mount the pipe to the side of the house (how far should it be held away from the wall to prevent fire hazard? and with what?), and up and around the gutters til it's above the roof line?
Any and all suggestions would be appreciated. Thanks in advance for the assistance.
p.s. the paint cans, etc on the shelves aren't there anymore. And the downward sloping 6" rigid metal duct work is for a downdraft cooktop in the kitchen above. This is the exterior wall to which I was referring.