Manuals / Bosch Appliances / Household Appliance / Water Heater

Bosch Appliances GWH-345/450-ESR-N Unpacking the GWH-345/450-ESR heater, Water resistant, Screws

Models: GWH-345/450-ESR-L GWH-345/450-ESR-N

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Water resistant

Appliance details

Water resistant

IP X4 (protection against water drops)

2.3Unpacking the GWH-345/450-ESR heater

This heater is packed securely.

The box includes:

•Wall-mounted gas fired recirculating water heater

•Bracket and screws for wall hanging the heater

•Exhaust vent adaptor (with 4 screws and gasket provided)

•Combustion air inlet adaptor (with 4 screws and gasket provided)

•Installation manual

•Product registration card

•Energy Guide label

•Pressure relief valve

•Inlet air restrictors

–GWH 345 ESR N: Ø38/40/42

–GWH 345 ESR LP: Ø38/40/42

–GWH 450 ESR N: Ø44/47/50/55

–GWH 450 ESR LP: Ø47/50/55/60

Do not lose this manual. Please complete and return the enclosed product registration card.

Before installing the unit, be certain you have the correct heater for your type of Gas - Propane or Natural Gas. Identification labels are found on the shipping box, and on the rating plate which is located on the right side panel of the cover.

To remove front cover

The front cover is secured with two

iscrews to prevent unauthorized access. Always secure the control panel and front cover with these screws.

B Loosen the two Philips head screws located as shown in fig. 2.

Fig. 2 Screws

B Pull control panel outwards and then pull it downwards (Fig. 3).

Front cover

Low voltage access cover

Control panel

Fig. 3 Service position to access water and electric connections

BLift front cover upward and remove.

The GWH-345/450-ESR is not approved or designed for:

•Manufactured (mobile) homes, RV's or boats

•Outdoor installation

•Combination venting with other appliances

•Closed loop heating applications.

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Bosch Appliances GWH-345/450-ESR-N Unpacking the GWH-345/450-ESR heater, Water resistant, Inlet air restrictors, Screws

Contents

Suitable for heating and recirculating potable water Temperature Modulated with Electronic IgnitionWhat to do if you smell gas GWH 345/450 ESRIndex For your safety1 Warning IndexWarning The recirculating water heater must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures equal to or more than 0.5 psig 14” W.C 2.2 GWH-345/450-ESR Specifications Technical data 2.1 FeaturesTemperature Control Dimensions2.3 Unpacking the GWH-345/450-ESR heater Fig. 3 Service position to access water and electric connectionsWater resistant Inlet air restrictorsAppliance details 2.4 General rules to follow for safe operationFig. 4 Dimensions 2.5 Dimensions and minimum installation clearancesFig. 5 Minimum clearances Table 1 Minimum clearances2.6 Applications Fig. 7 Service position to access water and electric connectionsIntroduction Pump Sizingpressure Table 2 Venting SpecificationsInlet water flow rate3.2 Proper location for installing your heater 3 Installation instructions3.3 Heater placement and clearances 3.4 Mounting installationFig. 10 Mounting the heater 3.5 Combustion air requirementsTwin pipe Single pipe1000 Btu/hr 292.81 watts if all air is taken from inside the building Appliances located in confined spacesInstallation instructions Table 3 Venting Specifications 3.6.1 Vent material and specifications3.6 Venting Vent lengthsFig. 13 Maximum vent and combustion air lengths Vent Safety SystemVent material Table 4 Vent manufacturer contact informationInstallation instructions Fig. 14 Exhaust vent connectionExhaust Selecting inlet air restrictorIntake Table 6 Determining equivalent vent length see example in TableTable 8 Restrictors table Fig. 16 Exhaust air inlet accessoryCombustion air inlet connection Fig. 15 Mounting sequence3.6.4 Room sealed installation Twin pipe Fig. 17 Required condensate drain installation3.6.3 Condensate drain requirements Fig. 18 Horizontal twin pipe terminationHorizontal runs 3.6.5 Vertical terminationsVent terminations Fig. 20 Vertical vent termination clearancesAttention residents of the Commonwealth of Massachusetts 3.6.6.1Requirements for installation in MassachusettsInstallation instructions 248 CMR 5.082a1 throughInstallation instructions Recommended exhaust vent terminator positionDescription Minimum distanceFig. 22 Horizontal side wall venting installation 3.6.7 Exhaust vent configuration examplesFig. 23 Vertical venting installation - Masonry Chimney Fig. 24 Vertical venting installationInstallation instructions 3.7 Gas piping & connectionsGAS CONNECTIONS FOR LP GAS FOR NATURAL GASInstallation instructions Maximum Capacity of Semi-Rigid flexible, non3.8 Measuring gas pressure Connecting manometer3.9 Checking restrictor plate size by measuring CO2 level value Fig. 27 Gas pressure measuring lower tapping3.11 Electrical connections 3.10 Water connectionsFig. 30 Plumbing Connections and Pressure Relief Valve Installation instructions4 Operating instructions 4.2 For your safety read before operating your water heater4.1 Initial filling instructions 4.3 Startup instructions4.5 Recirculating water temperature 4.4 Power4.6 Temperature and hot water flow Fig. 33 Recirculating water temperature adjustmentOperating instructions 4.8 Electrical diagramFig. 35 Electrical scheme 5.1 Service mode 5 Maintenance and serviceMaintenance and service Yearly maintenanceMode Exiting service modeParameter ValuesTroubleshooting TroubleshootingFault Indication Possible CauseFault Indication TroubleshootingPossible Cause CheckFunctional scheme 7 GWH-345/450-ESR Functional schemeGWH-345/450-ESR Functional scheme Interior components diagram and parts list 8 Interior components diagram and parts list8.1 Interior components Fig. 37 ComponentsInterior components diagram and parts list 8.2 Components diagramFig. 38 Components Diagram Interior components diagram and parts list 8.3 Parts listDescription ReferenceProtecting the environment 9 Protecting the environmentPacking ComponentsTen Year Limited Warranty 10 Ten Year Limited WarrantyService Labor Costs How to Make a ClaimBOSCH THERMOTECHNOLOGY CORPORATION Installer Checklist, to be performed by installer upon installation