Navien NPN User Manual

Getting Service
If your water heater requires service, you have several options for getting service:
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Contact Technical Support at 1-800-519-8794 or on the website: www.navieninc.com.
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For warranty service, always contact Technical Support first.
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Contact the technician or professional who installed your water heater.
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Contact a licensed professional for the affected system (for example, a plumber or electrician).
When you contact Technical Support, please have the following information at hand:
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Model number
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Serial number
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Date purchased
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Installation location and type
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Error code, if any appears on the front panel display
800.519.8794 www.navieninc.com
20 Goodyear lrvine, CA 92618
Installation & Operation Manual
NPN Non-Condensing Water Heaters
TANKLESS WATER HEATERS · BOILERS
Version: 1.0 (January. 2021)

Navien NPN Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Efficiency	Up to 0.96 UEF
Voltage	120V
Temperature Range	98°F - 140°F
Installation Type	Indoor/Outdoor
Max GPM	11.2 GPM
Gas Connection	3/4 inch NPT
Water Connection	3/4 inch NPT
Vent Size	2 inch or 3 inch PVC/CPVC
Warranty	15 years heat exchanger, 5 years parts

Summary

Getting Service

Service and Support Contact

Safety Information

Understanding Safety Symbols and Warnings

Explains safety symbols (DANGER, WARNING, CAUTION) and general safety guidelines.

Gas Leak, Fire, and Scalding Hazards

Crucial safety measures for gas leaks, fires, flammable storage, and preventing burns.

Electrical, Venting, and CO Safety

Safety protocols for electrical connections, proper venting, and carbon monoxide risks.

Installing the Water Heater

Site Selection and Installation Clearances

Mounting and Securing the Unit

Gas and Water Supply Connections

Procedures for connecting the gas and water lines, including pressure checks.

Venting System Installation and Condensate Management

Detailed steps for installing the exhaust vent system and managing condensate.

Power Supply Connection and DIP Switch Settings

Electrical hookup, safety, and configuration of DIP switches.