Navien NPE-180A2 Installation Manual page 75

Clearances Between Multiple Units
Ensure that the installed water heaters satisfy all
installation clearances provided in the manual. It is
essential that there is sufficient clearance space for
the common vent system to work properly.
The water heater units can be mounted either IN-
LINE or BACK TO BACK.
[Navien Modular Configuration with Rack System]
[In-line Setup] [Back to Back Setup]
Top
Back
Side
Bottom
[Clearance Chart for Common Vent Applications]
Bottom 12" (300 mm)
Back 0.5" (13 mm)
Side
3" (76 mm)
Front
4" (100 mm)
Top 9" (229 mm)
The recommended clearance from the
Note
TOP of the unit is 36" for servicing the
common vent.
Additionally, the recommended
clearance from the FRONT of the unit is
24" for maintaining and servicing.
Installing a Common Vent System
Side
Front
75