Installation Sheet
Rinnai Tankless Water Heater Installaon and Operaon Manual 27
All terminaons (horizontal and/or vercal) must terminate 12 in. (0.30 m) above grade or ancipated snow level.
12 in. (0.30 m)
Between terminals at same level
60 in. (1.52 m)
Between terminals at dierent levels
Note: 24 in. (0.61 m)
to wall or parapet
Combuson air and exhaust vent directly through a single
concentric connecon. Hot exhaust exits through the interior
tube, while combuson air enters through the outer layer.
Combuson
air
Exhaust
Concentric Pipe Terminaon Clearances
Direct Vent (Concentric Pipe)
1
Concentric Pipe Overview
Combuson
air
Inside
Corner
12 in.
(0.30 m)
12 in.
(0.30 m)
60 in. (1.52 m) vercal-
ly between terminals