I have just had a new powervent water heater installed by a licensed plumber. All looks well and runs well except the fact that there is a big draft coming back into the vent while the blower is not on. Not just some cold air but coming in pretty hard. This does not seem to be right. Forget the fact that I live in Chicago area where it has been 3 degree each morning this week it brings extremely cold air into the room
Details: Installed in Basement along with a high efficiency furnace Both use combustion air - obviously the Water heater would as there is no other option to vent out the side of the house. Full Basement not finished so plenty of air.
Vent goes essentially up and out the side of the house and meets all the venting criteria set aside including slope, length, limiting use of 90's etc per the Kenmore manual. The total run is only about 5 ft plus a few 45's which would make it about 17ft. It has 3" pipe.
Has anyone seen this before, I cannot find a whole lot of information and honestly the manufacturer has not been much help. They told me I have a venting issue but when telling them my setup they can't tell me what is wrong.