Entering High Temperature Mode (Commercial Mode) - Navien NR-21DU Manual

Entering High Temperature Mode (Commercial Mode)

1
10
se c
Press and hold the Up and Down button
simultaneously for 10 seconds.
When this mode is available, "HIGH" appears for
3 seconds.
When this mode is unavailable, "LoW" appears
for 3 seconds.
To prevent instant scalding or severe
burns, check the set temperature before
using hot water.
16 16
2
or
Press the Up button to increase the temperature by
1°F(0.5°C), and press the Down button to decrease
the temperature by 1°F(0.5°C)
Note Commercial Warranty applies when this
mode is used. Refer to the Warranty in
the Operation manual for more details.
Commercial mode is only available for
select models. Refer to the Operation
Manual supplied with the water heater.