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Rinnai Tankless Water Heater Installation and Operation Manual 37
1. Direct Vent (Concentric Pipe)
Concentric Pipe Overview
Combustion air and exhaust vent directly
through a single concentric connection.
Hot exhaust exits through the interior tube,
while combustion air enters through the
outer layer.
Combustion
air
Exhaust
Combustion
air
Figure 22: Concentric Pipe Termination Clearances
Insi de
Co r ne r
12 in.
(0.30 m)
12 in.
(0.30 m)
60 in. (1.52 m) ver�cally
betwe en terminal s
60 in. (1.52 m)
Note: 24 in. (0.61 m)
to wall or parapet
12 in. (0.30 m)
Figure 24: Between terminals at
dierent levels
Figure 25: Between terminals at same
level
All terminations (horizontal and/or vertical) must terminate 12 in. (0.30 m) above grade or anticipated
snow level.
Corner
Figure 23: Concentric Pipe
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