Originally Posted by Bob-D659
Without it, the flue gases from the existing hot water tank would be drawn into the room by the exhaust fan instead of going up the chimney.
we need to know if the burner is sealed to the room or if it draws its air from the room in order to make a statement to that effect.
"People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.