Installation Guide

Rinnai Tankless Water Heater Installation and Operation Manual 21
Table 6. Clearances

The water heater is not exposed to corrosive compounds in the air.

The water heater location complies with the required clearances.

The planned intake air and exhaust termination locations meet the required clearances.

The water supply does not contain chemicals or exceed total hardness that will damage
the heat exchanger.

A standard 3 prong 120 VAC, 60 Hz properly grounded wall outlet or other 120 VAC, 60
Hz source is available.

The installation must conform with local codes or, in the absence of local codes, with the
National Electric Code (NEC), National Fuel Gas Code, ANSI Z221.3/NFPA 54, and/or
CSA B149.1, Natural Gas and Propane Installation Code.
Use this checklist to ensure you have selected the correct location for the water heater.
Figure 7: Clearances
Location Clearance 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 0 in.
TOP
BOTTOM
SIDE
FRONT
CAUTION
If clearances are not met, damage to the property and water heater
may occur.