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NOTICE
This unit can be vented using only PVC (Class 160, ASTM D-2241 Schedule 40, ASTM D-1785;
or Cellular Core Schedule 40 DWV, ASTM F-891), Schedule 40 CPVC (ASTM F-411), or ABS
(ASTM D-2661) pipe. The fittings, other than the TERMINATIONS
should be equivalent to PVC-
DWV fittings meeting ASTM F-2665. (Use CPVC fittings, ASTM F-438 for CPVC pipe and ABS
fittings, ASTM D-266/3311 for ABS pipe.) If CPVC or ABS pipe and fittings are used, then the
proper cement must be used for all joints, including joining the pipe to the Termination (PVC
material). PVC materials should use ASTM –D2564 grade cement; CPVC materials should use
ASTM F-493 grade cement; and ABS materials should use ASTM D-2235 grade cement.
For water heaters in locations with high ambient temperatures (above 100°F (38°C)) and/or
insufficient dilution air, it is recommended that CPVC or ABS pipe and fittings (MUST USE
SUPPLIED VENT TERMINAL) be used.
Horizontal Installation:
In a horizontal application, it is important that condensate not be allowed to buildup in the exhaust vent pipe. To prevent this
from happening, the pipe should be installed with a slight upward slope of ¼ inch (.6 cm) per foot (.3 m). The vent system
must be supported every 5 feet (1.5 m) of vertical run and every 3 feet (.9 m) of horizontal run of vent pipe length.
CAUTION
Failure to properly support the vent piping with hangers and clamps may result in damage to the water
heater or venting system.
Stress levels in the pipe and fittings can be significantly increased by improper installation. If rigid pipe clamps are used to
hold the pipe in place, or if the pipe cannot move freely through a wall penetration, the pipe may be directly stressed, or high
thermal stresses may be formed when the pipe heats up and expands. Install accordingly to minimize such stresses.
Follow the following procedure to vent through the wall:
1. Cut one 2 ½ inch (6.4 cm) diameter hole for 2 inch (5.1 cm) diameter pipe. If venting with 3 inch (7.6 cm) pipe or 4
inch (10.2 cm) diameter pipe, use a bell reducer to reduce to 2 inch (5.1 cm) pipe before exiting the wall to use the
supplied 2 inch (5.1 cm) diameter vent terminal.
2. Use the proper PVC cement or sealant to secure the exhaust vent terminal provided with the water heater to the
plastic pipes. The distance between the back edge of the exhaust vent terminal and the exterior wall (see Figure 16)
must be 6 inches (13 cm). Use the proper cement and assembly procedures to secure the vent connector joints
between the terminal and the blower outlet. Provide support brackets for every 3 feet (.9 m) of horizontal vent.