Navien NPE-180A User Manual

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 height

(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-ON

Individual Vent

1-OFF

ON

ON

1       2      3      4      5      6      7      8      9     10

1       2      

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