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Rinnai Tankless Water Heater Installation and Operation Manual
4.3.6 Clearances
Location
Clearances to Combustibles
and Non-combustibles
Top
2 in. (51 mm)
0 in. from vent components
Bottom/Ground
12 in. (305 mm)
Front
0 in.
Clearance for servicing is 24 in. (610 mm)
in front of water heater
Back
0 in.
Sides (Left and Right)
2 in. (51 mm)
Add 0.25 in. (6.35 mm) for recess box
Vent
(Internal/Indoor Models)
0 in.
Front Exhaust
(External/Outdoor Models)
24 in. (610 mm)
Side
Top
Top
Side
Bottom
Bottom
Front
Front
Figure 8: Clearances
Table 6: Clearances
Internal (Indoor) Models
External (Outdoor) Models