Navien NPE-240S User Guide

To determine the size of a common vent:
Venting Intake and Exhaust to Di
erent Locations
●
Venting Intake and Exhaust to the Same Location
●
12" (300mm) min.
12" (300mm) min.
36" (900mm) min.
Exhaust
Intake
Cap
Condensate
Drain
W
D
H
Exhaust
Intake
Condensate
Drain
Exhaust
Intake
Cap
Condensate
Drain
Model :
NPE-180(A,S)/ 210(A,S)/ 240(A,S)
Common Venting Guide
Condensing Water Heater
When cascading the water heaters with other Navien water
heaters, you can install a common venting system. Do not use
common venting if the water heater is used in a cascading system
with other manufacturer’s water heaters. Include a condensate
drain in the main trunk as illustrated in the following examples.
1. Add the BTU/H input ratings for each water heater in the
cascading system to determine the total BTU/H rating.
2. Determine the total length (L) of the common vent, which
consists of the horizontal width (W) and the vertical heigh
t
(H):
Total length (L) = W + H.
The following are examples of common venting options:
Venting the Exhaust Only (Non-Direct)
●
Intake
Exhaust
Cap
Condensate
Drain
W
D
H
DANGER
Improper DIP switch settings can cause severe personal
injury, death or substantial property damage.
Switch Function Setting
1 Cascade Vent
Common Vent
1-ONIndividual Vent
1-OFF
ONON
1 2 3 4 5 6 7 8 9 10 1 2
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Navien NPE-240S Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
GPM at 77°F Rise	6.6 GPM
Maximum Input	199, 900 BTU/h
Water Flow Rate	11.2 GPM
Gas Connection	3/4 inch NPT
Water Connection	3/4 inch NPT
Voltage	120V
Temperature Range	98°F - 140°F
Venting	2"/3" PVC, CPVC
Warranty	15 years heat exchanger, 5 years parts
Energy Factor	0.96 UEF