Navien NHB Series User Manual

35Installing the System Piping
3.5.4 System Application - DHW System with Indirect Tank (Primary/Secondary Piping)
Make-up Water
Backflow preventer
Pressure reducing valve
DHW Outlet
DHW Inlet
Indirect Tank
Anti-scald mixing valve
System Pump
Boiler Pump
DHW Pump
Return filter
Expansion Tank
Air Separator
Note
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System application drawings are intended to explain the system piping concept only.
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Install a filter in the system return to remove foreign objects from the system. Foreign objects inside the system may result in
abnormal system operation.
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Refer to “3.3 Filling the System” on page 29 for make-up water connections and refer to the requirements of your local codes
to ensure compliance.
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Refer to the “3.6.8 Wiring Diagram - DHW System with Indirect Tank” on page 43 for wiring connections.

Navien NHB Series Specifications

General

Type	Condensing Boiler
Efficiency	Up to 95% AFUE
Fuel Type	Natural Gas or Propane
Vent Type	Direct Vent
Vent Diameter	2" or 3"
Heat Exchanger Material	Stainless Steel
Water Connections	3/4" NPT
Dimensions	Varies by model
Weight	Varies by model
Warranty	5-Year Parts