Bosch Appliances Model GWH 425 manual Setting the water temperature, Draining water from heater

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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

 

Degree rise

90°F

45°F

 

 

 

Activation rate

0.5 GPM

1.1 GPM

 

 

 

Max flow rate

2.0 GPM

3.7 GPM

 

 

 

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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Contents GWH-425-PN-N GWH-425-PN-L Index IndexGWH 425 PN specifications Technical data Over heat prevention temperature limiter Water resistantAppliance details Appliance detailsUnpacking the GWH 425 PN heater General rules to follow for safe operationDimensions and installation clearances Dimensions in Inches and mmInstallation instructions Proper location for installing your heaterHeater placement and clearances Installation instructionsMounting Heater Screws Incandescent particle trayCombustion air requirements Appliances located in confined spacesVenting Installation instructions Masonry chimney Existing interior masonry chimneyGas piping & connections GAS ConnectionsFor Natural GAS Connecting manometer Shut off gas Connecting the pressure relief valve PRVMeasuring gas pressure Water connectionsFor your safety read before operating your water heater Operation instructionsRecirculation application Operation instructionsLighting instructions To turn off applianceTemperature adjustment knob Setting the water temperatureDraining water from heater Maintenance and service Maintenance intervalsWater valve PilotVent assembly Main burnersMineral scale build-up Operate the circulating pumpTroubleshooting Pilot lights, but goes out when button is releasedIntroduction Pilot does not light Pilot goes out during or after hot water useBurners do not light with water flow Hot water temperature fluctuates at tapCheck for a clogged inlet water filter screen see chapter Noise when heater is running Water is too hotWater is not hot enough Burners ignite without hot water flowBurners do not operate cleanly yellow flames when operating Protecting the environment Protecting the environmentSaving water resources Interior components and diagram parts list Interior components and diagram parts listInterior components Components diagram Components DiagramParts list Description ReferenceFifteen Year Limited Warranty Bosch Group Bosch Water Heating Mad River Park Serial NumberGas Pressure Reading Static Waitsfield, VT all rights reserved