Navien NPE-180A2 Installation Manual page 36

External Recirculation with HotButton and Dedicated Return Line
NPE-A2 Water Heater
HotButton Kit
Ball
Valve
Check
City
Valve
Water
Supply
*The push buttons and the temperature sensor are not included with the water heater but are available for purchase.
36 Installing the Water Heater
Wired Push Button*
Expansion
Tank
[NPE-180A2/210A2/240A2]
Wired Push Button*
Temperature
DHW Supply
Return Water
Wired Push Button*
Sensor*