How to set temperature on navien tankless water heater

We recently moved into our new house and have a Navien NPE tankless water heater. This is our first experience with a tankless system - so far very happy with it. The factory default setting for the temperature is 120 degrees. By the time the water gets to the various faucets in the house, the water temp is more like 115 - 117 degrees. I don't want to waste energy or money (we use propane so more expensive than natural gas) but the water temp just feels a bit chilly to me. I am trying to resist bumping it up to 125 degrees (it only changes in 5 degree increments).

What do you have your tankless water heater set to?

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

6. Select the recirculation mode.

A2-Type:

●

– Int.Recir (Always On/Intelligent/Weekly)

– Ext.Recir (Always On/Intelligent/Weekly/

HotButton)

S2-Type:

●

– Ext.Recir (Always On/Intelligent/Weekly/

HotButton)

If the weekly recirculation mode is

Note

selected, confirm all daily time settings,

then press and hold the OK button

(

) for more than 2 seconds to

complete the setup wizard.

7. Setup Summary

Once the Setup Wizard is finished, a summary

of the settings will be displayed. Press the OK

button (

) at each summary screen until the

main screen is displayed. Settings made in the

Setup Wizard can be adjusted from the Main

Menu and Installer Menu as described in Section

6.4 and 6.5.

6.3 Adjusting the Water

Temperature

WARNING

Before adjusting the water temperature, read

"To prevent burns:" on page 5 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

Note

adjust the temperature only from 97 -

110 °F (36 - 43 °C).

2. Press the Up button (

(

) 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

Note

settings during a power outage.

You can adjust the temperature by 1 degree

increments as shown below, depending on the

temperature range:

Temperature range

97 °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

through the hot water faucet unless a recirculation

line has been installed from the furthest fixture back

to the water heater. For "A2" models, the unit must

be set to "external recirculation" mode.

) or the Down button

Adjusting the water

temperature

1 °F or 0.5 °C

increments

1 °F or 0.5 °C

increments

Operating the Water Heater

81

What temperature should a Navien tankless water heater be set at?

What temperature should a tankless hot water be?