Rheem GHE 119-500 Use & Care Manual page 13

4" Pipe (Factory Installed)
4"x6" Increaser
(Field Supplied)
Air Intake
Figure 8
MINIMUM AND MAXIMUM VENT LENGTHS
Note: Vent pipe size should not be
mixed for venting these units. Use
same size pipe for all venting of
the unit.
*NOTICE: The GHE Prefix on the model numbers
above can also be "THE"
DO NOT exceed the venting distances or the
number of elbows listed in this manual.
Table 4: Minimum and Maximum Vent and Air Intake Pipe Lengths (4" Pipe)
Fuel
Model(s)
Type
GHE119-500 NAT or
GHE125-500A
LP
1
Equivalent length is measured between the 4" pipe connection on the water heater and the required 90° elbow termination fitting.
2
Equivalent length is measure after the point of connection to the condensate assembly and includes the termination fitting (it used).
‡ Shown as a balanced system. Vent length may exceed air intake length if total combined length does not exceed 100 ft.
Intake length cannot exceed exhaust length.
Table 5: Minimum and Maximum Vent and Air Intake Pipe Lengths (6" Pipe)
Fuel
Model(s)
Type
GHE119-500 NAT or
GHE125-500A
LP
3
Equivalent length is measured between the 4" pipe connection on the water heater and the required 90° elbow termination fitting.
4
Equivalent length is measure after the point of connection to the condensate assembly and includes the termination fitting (it used).
‡ Shown as a balanced system. Vent length may exceed air intake length if total combined length does not exceed 240 ft.
Intake length cannot exceed exhaust length.
Installation
4"x6" Increaser
(Field Supplied)
4" Pipe
4"x3" Reducer
(Field Supplied)
(Field Supplied)
Exhaust Vent
Minimum Equivalent Pipe Length
Vent
Arrangement
Air Intake
Direct Vent 20
Power Vent 0
Minimum Equivalent Pipe Length
Vent
Arrangement
Air Intake
Direct Vent 50
Power Vent 0
NOTE: The equivalent straight pipe length of a 90°,
¼ standard bend elbow and a 45°, 1/8" standard
bend elbow is 5 feet, respectively. DO NOT use
short bend elbows.
NOTE: An elbow used as an exhaust vent termina-
tion fitting must be included when determining the
total number of elbows.
Notice: Vent terminals need
to be mounted horizontally a
minimum of 24 inches (center to
center) horizontally apart and
a maximum of 36 inches apart
(center to center). See Figure 17
for venting multiple units.
Exceeding the maximum lengths may cause
the water heater to malfunction or cause a
lock-out condition.
(per pipe run)
1 2
(ft) Vent (ft)
20
20
(per pipe run)
3 4
(ft) Vent (ft)
50
50
13
Maximum Equivalent Pipe Length
(per pipe run)
1
Air Intake (ft) Vent
‡
50
0
Maximum Equivalent Pipe Length
(per pipe run)
3
Air Intake (ft) Vent
‡
120
0
2
(ft)
‡
50
100
4
(ft)
‡
120
240