Menu
High-efficiency furnaces have white or black plastic vent pipes, which are 2″ – 3″ in diameter.
Mid-efficiency furnaces are usually less than 25 years old and have no pilot light.
Low-efficiency or “Standard” furnaces are more than 25 years old and usually have a pilot light.
Natural draft or atmospheric vented hot water tanks have a 3″ – 4″ steel vent pipe, which runs to a vertical chimney. The chimney is usually shared with standard or mid-efficiency furnaces.
Power vented hot water tanks have one or two black or white plastic vent pipe(s), which are 2″ – 3″ in diameter. The vent pipes usually exit from the side of the house.