Operating The Water Heater; Turning The Water Heater On Or Off; Adjusting The Water Temperature - Navien NPE-180A Operation Manual

3. Operating the Water Heater

3.1 Turning the Water Heater On or Off

To turn the water heater on or off, press the Power button.
When the power is on, the temperature will appear on the front
panel display.
8 Operating the Water Heater

3.2 Adjusting the Water Temperature

WARNING
Before adjusting the water temperature, read "To prevent
burns:" on page 4 carefully. Water above 120°F can cause
instant scalding, severe burns, or death.
The water heater is set to 120°F (49°C) by default. To adjust the
water temperature:
1. Make sure that all hot water faucets are closed, and ensure that
the internal circulator and any external circulating pumps are
off.
If a hot water faucet is open, you can adjust the
Note
temperature only from 98-110°F (37-43°C).
2. Press the + (Up) or – (Down) buttons until the desired
temperature appears on the display. You can adjust the
temperature while the display is flashing. Once the display
stops flashing, the temperature setting is stored.
The water heater will retain your settings during
Note
a power outage.
You can adjust the temperature by the below 10-degree
increments, depending on the temperature range:
Temperature range
98°F-120°F (Fahrenheit mode)
36°C-50°C (Celsius mode)
120°F-140°F (Fahrenheit mode)
50°C-60°C (Celsius mode)
The water heater will not provide hot water instantly at the hot
water faucet unless a recirculation line has been installed from the
furthest fixture back to the water heater. For "A" models, the unit
must be set to "external recirculation" mode.
Adjusting the water
temperature
1°F or 0.5°C increments
Press for 2 seconds to adjust in
5°F or 2°C increments