Bosch GWH 425 PN Specifications

GWH 425 PNINDOOR MODELFlow Modulated with Standing pilotSuitable for heating potable water only - Not approved for space heating purposes(Intended for

6 720 608 03410Installation instructionsMasonry chimneyMasonry chimneys shall be built and installed inaccordance with NFPS 211 or local codes.

6 720 608 034Installation instructions113.7 Gas piping & connectionsBefore connecting the gas supply, check the ratingplate on the right si

6 720 608 03412Installation instructionsFOR NATURAL GASMaximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and

6 720 608 034Installation instructions133.8 Measuring gas pressureConnecting manometerB Shut off gas.B Remove front cover and locate inlet gas

6 720 608 03414Operation instructions3.10 Recirculation applicationSince recirculation through the heater is notpermissible, the following drawi

6 720 608 034Operation instructions154.2 Lighting instructionsB STOP! Read the previous safety information.B The gas valve must be turned off by slidi

6 720 608 03416Operation instructions4.4 Setting the water temperatureThe GWH 425 PN has a gas control that modulatesburner input in respon

6 720 608 034Maintenance and service175 Maintenance and service5.1 Maintenance intervalsThe GWH 425 PN requires periodic maintenance. The below time m

6 720 608 03418Maintenance and service5.4 Main burnersThe main burner flames should be blue, with a moreintense blue cone in the center

6 720 608 034Troubleshooting196 Troubleshooting6.1 IntroductionMany of the questions customers ask regardingoperation of this unit can be answer

6 720 608 0342IndexIndex1 Warning 22 Appliance details 32.1 GWH 425 PN specifications (Technical data) 32.2 Unpacking the GWH 425 PN heater 42.3 G

6 720 608 03420Troubleshooting6. Verify pilot flame completely engulfs thethermocouple tip. If pilot is too small, clean pilot orifice(see chap

6 720 608 034Troubleshooting216.7 Water is too hot1. Verify gas type indicated in rating sticker located onright-hand side of cover, coincides wi

6 720 608 03422Troubleshootingthe way clockwise, the flow rate should be close to2gpm, filling the jug in 15 seconds. With thetempe

6 720 608 034Protecting the environment237 Protecting the environment PackingThe packing box may be fully recycled as confirmed bythe recycling symbol

6 720 608 03424Interior components and diagram parts list8 Interior components and diagram parts list8.1 Interior componentsFig. 28 Functional scheme4

6 720 608 034Interior components and diagram parts list258.2 Components diagramFig. 29 Components Diagram435049324846452829303125171819202123262427333

6 720 608 03426Interior components and diagram parts list8.3 Parts listItemDescriptionReference1 Front cover 8 705 431 246 02 Shield 8 705 506 817 03

6 720 608 034Fifteen Year Limited Warranty279 Fifteen Year Limited WarrantyGeneralBOSCH PRO water heaters are warranted by theManufacturer (BO

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6 720 608 034Appliance details32 Appliance details2.1 GWH 425 PN specifications (Technical data)Approved in US/CanadaCapacityGWH 425 PN: 4.3 GPMMaximu

6 720 608 0344Appliance details2.2 Unpacking the GWH 425 PN heaterThis heater is packed securely.Before installing the unit, be certain you have theco

6 720 608 034Appliance details52.4 Dimensions and installation clearancesFig. 3 Dimensions in Inches and (mm)4 Heat exchanger5 Burner10 Temperature co

6 720 608 0346Installation instructions3 Installation instructions3.1 IntroductionPlease follow these instructions. Failure to followinstruction

6 720 608 034Installation instructions73.4 Mounting HeaterRemove cover and inspect.B Remove the temperature control.B Unscrew the cover fixing screws,

6 720 608 0348Installation instructions3.5 Combustion air requirementsThe BOSCH PRO water heater holds cold water in itscopper heat exchanger and wate

6 720 608 034Installation instructions93.6 Venting B Minimum vent pipe diameter: 5 inchesB Minimum vertical vent height: 6 feet, with no elbowsB Estab