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Part II - Venting Specifications for:
40 Gallon, 40,000 BTU input (151.4 L, 11.7 kW/Hr)
48 Gallon, 40,000 BTU input (189.3 L, 11.7 kW/Hr)
This water heater is a power vented appliance and is designed to vent its
products of combustion through 2” (5.1 cm) or 3” (7.6 cm) diameter Schedule 40
(solid or cellular core) PVC pipe to the outdoors. The water heater may be either
vented through the wall or vertically through the roof. Use a 3” (7.6 cm) to 2” (5.1
cm) reducer to connect to the vent outlet when using 3” (7.6 cm) PVC. Apply
PVC cement at PVC locations. Table 7 lists the maximum vent lengths for this
water heater using 2” (5.1 cm) PVC. If possible, locate the water heater so that
the venting length and number of elbows are kept to the minimum distance
necessary to reach the outside. If the installation requires venting lengths that
exceed the lengths listed for 2” (5.1 cm) PVC in Table 7 then use 3” (7.6 cm)
PVC for the vent connector. Table 8 lists the venting distances allowed with 3”
(7.6 cm) diameter PVC pipe. When venting with 3” (7.6 cm) PVC, use a 3” (7.6
cm) to 2” (5.1 cm) reducer to exit through the building wall with 2” (5.1 cm) PVC.
Use the 2” (5.1 cm) vent terminal supplied with the water heater to terminate on
the outside of the building. If the length of the 2” (5.1 cm) needed to go through
the wall is greater than 14” (35.6 cm), use 3” (7.6 cm) PVC to go through the wall
and reduce to 2” (5.1 cm) PVC immediately after exiting the outside wall. Refer
to the venting illustrations on the following pages. Make sure the vent pipe
terminal is at least 1” (2.5 cm) away from the edge of the wall. To vent
horizontally with zero (0) elbows, remove 3 screws from blower housing
and rotate the blower housing 90° clockwise (see Figure 7). Replace the
three (3) screws once blower housing rotation is complete.
TABLE 7- VENT CONNECTOR LENGTHS FOR 2” (5.1cm) DIAMETER PVC
Terminating # of 90° Elbows
(excluding vent
terminal)
Maximum
Length
Minimum
Length
Through the Wall 0 45 ft (13.7m) 2 ft (.6 m)
Through the Wall 1 40 ft (12.2m) 2 ft (.6 m)
Through the Wall 2 35 ft (10.7m) 2 ft (.6 m)
Through the Wall 3 30 ft (9.2 m) 2 ft (.6 m)
Through the Wall 4 25 ft (7.6 m) 3 ft (.9 m)
Through the Roof 0 31 ft (9.5 m) 3 ft (.9 m)
Through the Roof 1 28 ft (8.5 m) 3 ft (.9 m)
Through the Roof 2 25 ft (7.6 m) 3 ft (.9 m)
Through the Roof 3 22 ft (6.7 m) 3 ft (.9 m)
Through the Roof 4 19 ft (5.8 m) 4 ft (1.2 m)
Venting (Part II) continued-
TABLE 8-VENT CONNECTOR LENGTHS FOR 3” (7.6 cm) DIAMETER PVC
INTERNET VERSION FOR REFERENCE ONLY