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13
The Minimum and Maximum equivalent lengths for the vent and combustion
air-inlet systems are shown in Table 1.
*Use only Rheem 3 inch concentric termination kit (SP20245). The use of any other kit is not approved. Contact
your installer or local distributor for assistance. Refer to page 37 & 38 for installation of alternate concentric vent
termination.
Table 1
From 0 ft. through 5,999 ft.
Model
Vent & Combustion
Air-Inlet System
Diameter
Min. Allowed Equivalent
Vent & Combustion Air-
Inlet Lengths (Each Pipe
Run)
Max. Allowed Equivalent
Vent & Combustion Air-
Inlet Lengths (Each Pipe
Run)
Vent and Combustion Air-Inlet
System Termination(s)
Inches Feet Feet
38 and 48
Gallon Heaters
2 7 30 90° Elbows Concentric*
3 7 60 90° Elbows Concentric*
From 6,000 ft. through 8,999 ft.
Model
Vent & Combustion
Air-Inlet System
Diameter
Min. Allowed Equivalent
Vent & Combustion Air-
Inlet Lengths (Each Pipe
Run)
Max. Allowed Equivalent
Vent & Combustion Air-
Inlet Lengths (Each Pipe
Run)
Vent and Combustion Air-Inlet
System Termination(s)
Inches Feet Feet
38 and 48
Gallon Heaters
2 Not allowed Not allowed ------------ ------------
3 7 45 90° Elbows Concentric*
NOTICE: A 90° elbow is equivalent to 5 ft. of straight pipe. A 45° elbow is equivalent to 2.5 ft. of straight pipe.
The use of a 45° elbow is preferred over a 90° elbow. The vent and combustion air-inlet terminations are not
included in the equivalency calculations.
NOTICE: The mixing of 2" and 3" piping is not
allowed. If 3" pipe is used, a 3" to 2" reducer
fitting is allowed at the vent connector fitting.
This water heater is supplied with a 2" PVC
(Schedule 40) 90° vent terminal. When venting
with 3" pipe, Schedule 40 PVC 90° vent terminals
must be used. Screens for both 2" and 3" vent
terminals have been included.
Wind vane for 3" combustion inlet terminals have
been included. Wind vane should be cemented to
the combustion intake terminal using PVC cement.
Wind vane should be cemented as shown in figure
on page 16.
IMPORTANT: Ensure that all the coupling clamps are
tightened before allowing the water heater to operate.
When using PVC, CPVC or ABS pipe and fittings, use 90°
elbows of the corresponding size and material for the vent
terminal and combustion air-inlet terminals.
• Maintain a minimum vertical height of 6 in. of pipe,
including pipe increasers (if used), from the blower
exhaust coupling before a transition into any elbow.
Elbows are limited to a total equivalent length of 20 ft.
(6 m). Maximum allowed four (4) 90° elbows or eight
(8) 45° elbows.
DO NOT use short sweep
elbows. It is recommended to use
only standard and/or long sweep
elbows. See examples as shown.
Additional Fitting Considerations
2 in. pipe diameter
Vent
Combustion air-inlet
Min. 2 1/2 in. to
6 in. Max. Spacing
Min. 2 1/2 in. to
6 in. Max. Spacing
2 in. pipe diameter
3 in. diameter pipe
3 in. diameter pipe
Vent Connector Fitting
Rubber Coupling
Long Sweep 90° Elbow
Standard 90° Elbow
Short Sweep 90° Elbow
Examples of Elbows:
DO NOT use.
GOOD
BEST
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