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Operation instructions
4.4
Setting the water temperature
The GWH 425 HN has a gas control that modulates
burner input in response to flow. Its purpose is to
ensure that the hot water temperature will remain
steady, although the water flow demand might vary. The
output temperature can be adjusted with either the
temperature adjustment knob or the gas control knob.
Temperature adjustment knob
The temperature adjustment knob on the front bottom of
the heater (see Fig. 20) adjusts temperature by
adjusting flow capacity. See table 4 for details.
Fig. 20
Knob
Clockwise
position
Degree rise
90°F
Activation rate
0.5 GPM
Max flow rate
2.0 GPM
Table 4 Clearances
As the temperature adjustment knob is turned counter-
clockwise, the output temperature will lower and the
activation rate will be raised. Turning the knob
clockwise will raise the temperature and lower the
activation rate.
16
Counter-
clockwise
45°F
1.1 GPM
3.7 GPM
4.5
Power adjustment
Less power.
Lower water temperature.
Fig. 21
More power.
Higher water temperature.
Fig. 22
4.6
Purge the appliance
If there is a risk of freezing, proceed as follows:
B Remove the retaining clip from threaded bushing
(pos. 1).
B Remove threaded bushing (pos. 2) from water valve.
B Empty the appliance of all water.
Fig. 23 Purge
1
Retaining clip
2
Threaded bushing
6 720 608 036
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