Specifications

Installation (Venting) continued-

Vent pipes serving power vented appliances are classified by building codes as “vent

connectors”. Required clearances from combustible materials must be provided in

accordance with information in this manual under LOCATION OF WATER HEATER

and CLEARANCES, and with National Fuel Gas Code and local codes.

Part I - Venting Specifications for:

48 Gallon, 65,000 BTU input (189.3 L, 19.1 kW/Hr)

75 Gallon, 75,000 BTU input (283.9 L, 22.0 kW/Hr)

This water heater is a power vented appliance and is designed to vent its

products of combustion through 3” (7.6 cm) or 4” (10.2 cm) diameter Schedule 40

PVC pipe to the outdoors. This water heater may be either vented through the

wall or vertically through the roof. The blower outlet is designed to fit 3” (7.6 cm)

diameter PVC pipe. Use a 3” (7.6 cm) to 4” (10.2 cm) reducer to connect to the

vent outlet when using 4” (10.2 cm) PVC. Seal the joint between the PVC pipe

and the blower outlet collar with RTV sealant (See figure 2). Table 1 lists the

maximum vent lengths for this water heater using 3” (7.6 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 3” (7.6 cm) PVC in

Table 1, then use 4” (10.2 cm) PVC for the vent connector. Table 2 lists the

venting distances allowed with 4” (10.2 cm) diameter PVC pipe. When venting

with 4” (10.2 cm) PVC, use a 4” (10.2 cm) to 3” (7.6 cm) reducer to exit through

the building wall with 3” (7.6 cm) PVC. Use 3” (7.6 cm) vent terminal supplied

with the water heater to terminate on the outside of the building. If the length of

the 3” (7.6 cm) PVC needed to go through the wall is greater than 14” (35.5 cm),

use 4” (10.2 cm) to go through the wall and reduce to 3” (7.6 cm) PVC

immediately after exiting the outside wall. Refer to the venting illustrations on the

following pages.

Make sure the vent pipe terminal elbow fitting is at least 1” (2.5 cm) away from

the edge of the wall.

TABLE 1 - VENT CONNECTOR LENGTHS

FOR 3” (7.6 cm) DIAMETER PVC

Terminating # of 90° Elbows

(excluding vent

terminal)

Maximum

Length

Minimum

Length

Through the Wall 1 40 ft (12 m) 2 ft (.6 m)

Through the Wall 2 35 ft (10.5 m) 3 ft (.9 m)

Through the Wall 3 30 ft (9 m) 5 ft (1.5 m)

Through the Wall 4 25 ft (7.5 m) 8 ft (2.4 m)

Through the Roof 1 40 ft (12 m) 2 ft (.6 m)

Through the Roof 2 35 ft (10.5 m) 3 ft (.9 m)

Through the Roof 3 30 ft (9 m) 5 ft (1.5 m)

Through the Roof 4 25 ft (7.5 m) 8 ft (2.4 m)