Operation instructions
4.4Setting the water temperature
The GWH 425 PN 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 slide.
Temperature adjustment knob
The temperature adjustment knob on the front bottom of the heater (see Fig. 23) adjusts temperature by adjusting flow capacity. See table 4 for details.
The hottest position is the highest flame position all the way to the right.
Fig. 23
Knob | Clockwise | Counter- | |
position | clockwise | ||
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Degree rise | 90°F | 45°F | |
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Activation rate | 0.5 GPM | 1.1 GPM | |
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Max flow rate | 2.0 GPM | 3.7 GPM | |
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Table 4 Temperature rise (slide control to the right)
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.
Gas control slide button
The gas control slide button adjusts temperature by adjusting how much gas is allowed to flow to the burners.
As the slide is adjusted to the left, the output temperature will lower, with the lowest setting being the small flame position.
Fig. 25
4.5Draining water from heater
If there is a risk of freezing, proceed as follows:
B Remove the retaining clip from threaded bushing (pos. 1).
BRemove threaded bushing (pos. 2) from water valve.
BEmpty the appliance of all water.
Fig. 26 Drain plug and filter location
1Retaining clip
2Threaded bushing
Fig. 24
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