Navien NPE-240A Quick Installation Guide

2
Gas Piping Connections
Water Piping Connections (NPE-180A/210A/240A)
Condensate Drain Connection
A condensate drain pipe must be connected to the 1/2” condensate outlet fitting at
the bottom of the unit and water must be poured into the exhaust connection to fill
the condensate trap.
The end of the 1/2” (NPT) plastic piping should drain into a laundry tub or into a floor
drain.
Do not submerge the end of the
pipe in water.
Note
Internal Recirculation
Hot Water Supply
Shutoff Valve
Pressure
Relief Valve
Cold Water Supply
Condensate Drain
Gas Supply
Full port
Union
Internal Recirculation Settings
ON
OFF
2
-way valve
External Recirculation
Condensate Drain
Shutoff Valve
Pressure
Relief Valve
Expansion Tank
Hot Water supply
Gas Supply
Full port
Union
Cold Water Supply
Recirculation Line
External Recirculation Settings
ON
OFF
2-way valve
The water heater is recommended to be
the first appliance to be connected
to the
gas supply line.
Gas meter
’
s capacity
≥
Total gas capacity of connected appliances
Gas supply
Gas
regulator
Bottom View
Gas Inlet Adapter
Gas Supply Line
Example:
Gas meter
425 CFH
≥
Water heater
195 CFH
+
Furnace
58.8 CFH
+
Domestic gas stove
63.7 CFH
* 1 CFH=1,020 Btuh
• 1/2" rigid pipe can be used; refer to the sizing tables in the Installation
Manual for limitations. Avoid using 1/2" corrugated connectors or tubing
as
noise may occur.
Syphon
Condensate
Outlet
Water
Floor drain
Direct to the
external drain
To the drain via
a neutralizer
External drain
To the laundry
tub
To the laundry tub
via a condensate pump

Navien NPE-240A Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Energy Factor	0.97
Energy Efficiency	97%
Voltage	120V
Ignition Type	Electronic
Maximum Input	199, 900 BTU/h
Water Connection Size	3/4"
Gas Connection Size	3/4"
Warranty	15-year on heat exchangers, 5-year on parts, 1-year on labor
Dimensions	17.3" W x 13.2" D x 27.4" H