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Installing the Water Heater
Table 1
From Sea Level through 5,999 ft. (1,828 m) Above Sea Level
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 Meters Feet Meters
40 Gallon, 40,000
& 38,000 Btu/hr.
Models
2 7 2 30 9 90° Elbows Concentric*
3 7 2 60 18 90° Elbows
3 7 2 50 15 Concentric*
50 Gallon, 40,000
Btu/hr. Models
2 7 2 30 9 90° Elbows Concentric*
3 7 2 60 18 90° Elbows
3 7 2 50 15 Concentric*
From 6,000 ft. (1,828 m) Above Sea Level through 7,700 ft. (2,347 m) Above Sea Level
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 Meters Feet Meters
40 Gallon, 40,000
& 38,000 Btu/hr.
Models
2 7 2 15 4.5 90° Elbows
2 7 2 30 9 Concentric*
3 7 2 60 18 90° Elbows
3 7 2 50 15 Concentric*
50 Gallon, 40,000
Btu/hr. Models
2 7 2 15 4.5 Concentric*
3 7 2 60 18 90° Elbows
3 7 2 50 15 Concentric*
From 7,701 ft. (2,347 m) Above Sea Level through 10,200 ft. (3,109 m) Above Sea Level
Model
Vent & Combus-
tion 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 Meters Feet Meters
40 Gallon, 40,000
& 38,000 Btu/hr.
Models
2 7 2 15 4.5 Concentric*
3 7 2 60 18 90° Elbows
3 7 2 50 15 Concentric*
50 Gallon, 40,000
Btu/hr. Models
3 7 2 60 18 90° Elbows
3 7 2 50 15 Concentric*
14
*Use only Rheem 3 in. (7.6 cm) concentric termination.
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