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The following diagram shows the basic operation of an NHW700 Series water heater recirculation system with
the NaviCirc and HotButton.
Ball Valve
Check Valve
City Water Supply
Expansion Tank
* The NaviCirc recirculation valve and the temperature sensor are not included with the water heater but they are available for
purchase.
** When the optional temperature sensor is installed, it must be insulated. The sensor wire may be extended by up to 100 ft
(30 m) using 22AWG wire.
External Recirculation with HotButton and Dedicated Return Line
NHW700-A 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.
32
Installing the Water Heater
Push Button
Contact Signal
Wired Push Button*
Expansion
Tank
[NHW700-160A/180A/199A]
Push Button
Contact Signal
DHW Supply
Temperature Sensor**
Return Water
Wired Push Button*
Temperature
DHW Supply
Return Water
Push Button
Contact Signal
NaviCirc*
Wired Push Button*
Sensor*
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