Demand Duo
™
H
-
Series Installation and Operation Manual
24
Twin Pipe Installation Instructions
DO NOT
apply PVC glues, solvents, or clean-
ers to the water heater
’
s combustion air or
exhaust gasket connections. Failure to cor-
rectly assemble the components according to
these instructions may result in property dam-
age, personal injury, or death.
WARNING
The water heater is equipped with a 2 in. (51
mm) pipe connection. With the use of a pipe
reducer, installers can use a 3 in. (76 mm) pipe
for the combustion air and exhaust.
1.
Remove and discard the screw from the
combustion air vent connection.
Combustion Air
Vent Pipe
Supplied
screw
Exhaust Vent Pipe
Supplied
screw
Direct Vent
(Twin Pipe)
1
2.
Remove and discard the combustion
air vent cap.
3.
Install the combustion air vent pipe.
Ensure it is properly seated.
Secure the combustion air vent pipe to the
combustion air vent connection with the
supplied screw.
4.
Install the exhaust vent pipe. Ensure it is
properly seated.
Secure the exhaust vent pipe to the exhaust
adapter ring with the supplied screw.
Figure 24
Figure 25
Figure 26
Figure 27
