Navien NPN-160E 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-160E Specifications

General

Type	Tankless
Heating Capacity	160, 000 BTU/h
Max. Input	160, 000 BTU/h
Min. Input	15, 000 BTU/h
Energy Efficiency	0.96 UEF
Water Connection	3/4" NPT
Gas Connection	3/4" NPT
Voltage	120 V
Minimum Activation Flow Rate	0.5 GPM
Fuel Type	Natural Gas
Energy Factor	0.96
Vent Size	3 in
Venting	Direct Vent
Temperature Range	140°F
Warranty	15 Years

Summary

Safety Information

General Safety Warnings

Critical safety guidelines covering gas, flammables, and operational hazards.

Flammable and Combustible Material Warnings

Specific warnings about storing and using flammable liquids and materials near the unit.

Scalding Hazard Prevention

Information on preventing burns from hot water and recommended settings.

Installing the Water Heater

Choosing an Installation Location

Factors for selecting a suitable and safe installation site.

Adequate Drainage and Venting

Requirements for proper drainage and ventilation system installation.

Installation Clearances

Required distances from combustibles and building structures.

Mounting the Water Heater to the Wall

Procedures for securely attaching the unit to a wall.

Connecting the Gas Supply

Guidelines and safety for connecting the gas line.

Measuring the Inlet Gas Pressure

Connecting the Water Supply

Instructions for hooking up the water inlet and outlet lines.

External Pump Wire Connection

Connecting a Pressure Relief Valve

Venting the Water Heater (Indoor Models Only)

Proper installation of the exhaust vent system.

About the Vent Installation Detector

Maintaining Clearances

Measuring Vent Length and Terminating the Vent

Draining Condensate

Connecting the Power Supply

Safety and procedures for electrical hookup.

Setting the DIP Switches

Configuration of internal switches for various functions.

Installing a Cascade System

Connecting Water Supplies

Connecting Communication Cables

Appendixes

Wiring Diagram

Installation Check list

A comprehensive checklist to verify proper installation.