Navien NPE Installation & Operation Manual page 16

Access to Utilities
Water – the installation location should be near where the
domestic water supply enters the building.
Gas – the installation location should be near where the gas
supply enters the building.
Electricity – the installation location should be near where the
electrical supply enters the building.
Adequate Drainage
The water heater produces a significant amount of condensate
during operation. The water heater should be located near a
suitable drain and where damage from a possible leak will be
minimal. Installing the water heater in a location without a drain
will void the warranty and Navien will not be responsible for
water damages that occur as a result. For more information about
condensate drainage, refer to "3.5 Connecting the Condensate
Drain" on page 30.
The water heater must be located in an area where leakage of the
unit or connections will not result in damage to the area adjacent
to the appliance or to lower floors of the structure. When such
locations cannot be found, installation of an adequately drained
drain pan under the water heater is highly recommended. When
installing the drain pan, ensure that the installation does not
restrict combustion air flow.
16 Installing the Water Heater
Adequate Venting and Ventilation
Select a location that requires minimal venting. Consider venting
restrictions caused by windows, doors, air intakes, gas meters,
foliage, and other buildings. For more information about venting,
refer to "3.6 Venting the Water Heater" on page 32.
To ensure adequate venting and ventilation, follow these
guidelines:
Maintain proper clearances from any openings in the building.
Install the water heater with a minimum clearance of 12 in
(300 mm) above an exterior grade or as required by local codes.
Maintain a minimum clearance of 4 ft (1.2 m) from heating and
cooling vents.
Do not enclose the vent termination.
Install the exhaust vent in an area that is free from obstructions
and does not allow the exhaust to accumulate.
Do not install the water heater where moisture from the exhaust
may discolor or damage walls.
Do not install the water heater in bathrooms, bedrooms, or any
other occupied rooms that are normally kept closed or that are
not adequately ventilated.
Proximity to Fixtures and Appliances
Install the water heater near fixtures that deliver or use hot water,
such as bathroom, kitchen, and laundry room faucets. Select a
location that minimizes the water piping required between major
fixtures. If the distances are long or if the water heater requires
"instant" hot water, we recommend running a recirculation line
back to the water heater from the furthest fixture. Insulate as
much of the hot water supply and recirculation lines as possible.
For more information about the water supply, refer to "3.4
Connecting the Water Supply" on page 23.
Adequate Installation Clearances
Install the water heater in an area that allows for service and
maintenance access to utility connections, piping, filters, and traps.
Based on the installation location, ensure the following clearances
are maintained:
Clearance from: Indoor Installation
9 in (229 mm)
Top
minimum
0.5 in (13 mm)
Back
minimum
4 in (100 mm)
Front
minimum
3 in (76 mm)
Sides
minimum
12 in (300 mm)
Bottom
minimum
Outdoor Installation
36 in (900 mm)
minimum
0.5 in (13 mm)
minimum
24 in (600 mm)
minimum
3 in (76 mm)
minimum
12 in (300 mm)
minimum