Bosch C1210ES Specifications

C 1210 ES/ESCINDOOR RESIDENTIAL AND COMMERCIAL MODELSTemperature Modulated with Electronic IgnitionSuitable for heating potable water and space heatin

6 720 644 88710Installation instructions3 Installation instructions3.1 Specialized toolsThe following specialized tools may be required for installati

6 720 644 887Installation instructions113.3.1 Vent materialAll combustion air and vent pipe materials and fittings must comply with the following:For

6 720 644 88712Installation instructions3.3.2 Vent specificationsEstablish vent clearances that comply with the ventmanufacturer's specif

6 720 644 887Installation instructions13Calculation example for 3" venting:ExhaustCombustion airCalculation example for 4" venting:ExhaustCo

6 720 644 88714Installation instructionsRequired direct vent terminal clearances (twin pipe / concentric penetration)Fig. 9* For clearances not specif

6 720 644 887Installation instructions15Required other than direct vent terminal clearances (single pipe penetration)Fig. 10* For clearances not speci

6 720 644 88716Installation instructions3.3.3 Vent configuration examplesBelow are approved examples of vertical and horizontal venting installations.

6 720 644 887Installation instructions17Fig. 15 Horizontal venting system (single pipe pene-tration)*Warning: Single pipe penetration should be used i

6 720 644 88718Installation instructionsAppliance condensate drain installationThe appliance comes equipped with an internalcondensate drain and

6 720 644 887Installation instructions19Backdraft reducerThe Heat Fab backdraft reducer (9301BFP) is the pre-ferred option for limiting backdraft (see

6 720 644 8872IndexIndex1 Warning 32 Appliance details 52.1 Features 52.2 Specifications (Technical data) 52.3 Unpacking the tankless water heater

6 720 644 88720Installation instructions3.3.7 Fan speed adjustment! IMPORTANT INFORMATION:Natural gas heaters with installation altitudesbelow 2

6 720 644 887Installation instructions21NG LPG NG/LPGAltitude (above sea level)Vent terminalTotal equivalent vent length1)Minimum power fan speed (P2)

6 720 644 88722Installation instructionsAdjusting minimum power fan speed (P2)To select fan speed:B Press ON/OFF button into OFF.B Press and hold

6 720 644 887Installation instructions23Attention residents of the Commonwealth of Massachusetts:In the Commonwealth of Massachusetts the followingreg

6 720 644 88724Installation instructions3.4 Combustion air requirementsTwin pipeThe tankless water heater is designed as a sealedcombustion a

6 720 644 887Installation instructions253.5 Proper location for installing your heaterCarefully select the location of the water heater. Forsa

6 720 644 88726Installation instructionsFig. 27 Leveling wall mounting bracketFig. 28 Mounting the heater3.8Gas piping & connections Before conne

6 720 644 887Installation instructions27Fig. 29 Gas connectionOnce connections are made, check for gas leaks at all joints. Apply some gas leak detect

6 720 644 88728Installation instructionsFOR NATURAL GASMaximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and

6 720 644 887Installation instructions293.9 Water connections B When facing the heater, the ¾" cold connection ison the bottom right and the hot

6 720 644 887Warning31 WarningFor your safetyDo not store or use gasoline or other flammable,combustible or corrosive vapors and liquids

6 720 644 88730Installation instructionsConnecting the pressure relief valve (PRV)The listed pressure relief valve must be installed at thetime of ins

6 720 644 887Installation instructions313.11 Filling the condensate trapThe condensate trap can be filled before or afterconnecting the vent p

6 720 644 88732Installation instructions3.12 Domestic hot water recirculationAlthough recirculation directly through the tanklesswater heater i

6 720 644 887Installation instructions333.13 Space heating applicationsBosch tankless water heaters are approved for use incombination DHW and spac

6 720 644 88734Installation instructionsFig. 42 Space heating diagram1 Hot water outlet2 Cold water inlet3 Pressure relief valve4 Gas supply5 Shut off

6 720 644 887Installation instructions353.14 Measuring gas pressureGas pressure must be measured upon installation.Connecting manometerB Shut off gas

6 720 644 88736Electrical connections4 Electrical connections4.1 Electrical power supplyThe tankless water heater requires an electrical powersupply

6 720 644 887Operation instructions375 Operation instructionsFig. 481 On/Off button2 Reset button3 Program button4 LCD display5 Up button6 Down button

6 720 644 88738Operation instructions5.2 For your safety read before operating your water heaterA. This appliance is equipped with electronic ignition

6 720 644 887Operation instructions39Solar modeThe water heater will not ignite if inlet water temperatureexceeds the set temperature on the applia

6 720 644 8874WarningFCC:This device complies with Part 15 of the FCC rules.Operation is subject to the following two conditions: (1)This dev

6 720 644 88740Maintenance and service5.8 Program buttonFig. 63 “Program” key5.8.1 Memorizing selected temperatureB Press buttons or to select

6 720 644 887Maintenance and service41Inlet Water Filter• Verify the inlet filter screen is clean and undamaged.The inlet water filter is located betw

6 720 644 88742Maintenance and service13. Disconnect all lines and drain all solution from heatexchanger. Properly discard of solution.14. Position a

6 720 644 887Maintenance and service43P1 Operating Pressure: “ WCThe P1 minimum operating gas pressure is 3.5" WC for Natural Gas and 8" W

6 720 644 88744Maintenance and serviceFinal ReadingsP1 CO2 Reading: % CO2P2 CO2 Reading: % CO2D. Returning to Service:1. Return slotted screw cove

6 720 644 887Maintenance and service456.6 Program valuesThis section describes details on programming the appliance. For most applications the factory

6 720 644 88746Maintenance and service6.7 Diagnostic menu1. Press ON/OFF button to turn off the appliance.2. Press and hold "Program"

6 720 644 887Troubleshooting477 Troubleshooting7.1 IntroductionMany of the questions customers ask regardingoperation of this unit can be answer

6 720 644 88748TroubleshootingContact your original installer or a local certified gastechnician to obtain this reading.7. Cold water is mixing in

6 720 644 887Troubleshooting49specifications in Section 3.4, page 24 CombustionAir Requirements.4. Cross contamination. Ensure that intake and exhaust

6 720 644 887Appliance details52 Appliance details2.1 FeaturesResidential/commercial models• C 1210 ES residential model– maximum temperature 140° F•

6 720 644 88750Error codes8 Error codes8.1 Error code diagnosticsiTo remove error code from thedisplay, press the reset button.Display Cause Solu

6 720 644 887Error codes51Primary fan rotation too low inoperation.1. Reset errors, disconnect power supply cord and check wireconnectio

6 720 644 88752Error codesExhaust temperature sensor - theappliance will close the burner andlock if it gets over 194°F; (onlyapplied for co

6 720 644 887Error codes53Ionization failure during operation. 1. Check gas type, Fig. 2, page 6.2. Check three wire connections to ignition gr

6 720 644 88754Electrical diagram9 Electrical diagramFig. 72 Electrical scheme1 Inlet water temperature sensor2 Outlet water temperature sensor3 Backf

6 720 644 887Sensor resistance charts5510 Sensor resistance chartsFig. 73Fig. 74Outlet sensor characteristics3 23 74 24 752576 26 772778 28 79 29 710

6 720 644 88756Sensor resistance chartsFig. 75Back Flow and Exhaust sensor characteristics3 23 74 24 75 25 76 26 77 27 78 28 79 29 710 210 711211712 2

6 720 644 887Functional scheme5711 Functional schemeFig. 76 Functional scheme

6 720 644 88758Interior components diagram and parts list12 Interior components diagram and parts list12.1 Interior componentsFig. 77 Components1 Exha

6 720 644 887Interior components diagram and parts list59Fig. 78 Appliance overview6720608836-02.1AL

6 720 644 8876Appliance details• Minimum recommended water pressure: 30 PSI(2.07 bar)• Minimum well pressure 40 psi, see page 29.• Connections:–

6 720 644 88760Interior components diagram and parts list12.2 Components diagram12.2.1 Group 1Fig. 79 Components Diagram998512367910129141617111315154

6 720 644 887Interior components diagram and parts list6112.2.2 Group 2Fig. 80 Components Diagram10142815123025202122171628312681816131917272819132713

6 720 644 88762Interior components diagram and parts listItem Description Reference1 Heat exchanger 8 705 406 4192 Heat exchanger top gasket 8 704 701

6 720 644 887Interior components diagram and parts list6312.2.3 Group 3Fig. 81 Components Diagram151413467821291113161756720902988.AA JF6Item Descript

6 720 644 88764Interior components diagram and parts list12.2.4 Group 4Fig. 82 Components Diagram9214134567811111213106720902990.AA JFItem Description

6 720 644 887Interior components diagram and parts list6512.2.5 Group 5Fig. 83 Components Diagram91112131012344567891114151617126720902989.AA JF(optio

6 720 644 88766Interior components diagram and parts list12.2.6 Group 6Fig. 84 Components Diagram376951041215131614126720608158-75.2V11Item Descriptio

6 720 644 887Protecting the environment6713 Protecting the environment PackingThe packing box may be fully recycled as confirmed bythe recycling symbo

6 720 644 88768LIFETIME LIMITED WARRANTY FOR BOSCH TANKLESS WATER HEATERS14 LIFETIME LIMITED WARRANTY FOR BOSCH TANKLESS WATER HEATERS14.1 Limited war

6 720 644 887LIFETIME LIMITED WARRANTY FOR BOSCH TANKLESS WATER HEATERS69LIMITED WARRANTYOTHER THAN THE OBLIGATIONS OF BTCEXPRESSLY SET FORTH

6 720 644 887Appliance details7To remove front coverB Loosen the two Phillips head screws located onbottom rear of cover (see Fig. 3).Fig. 3 Lo

6 720 644 88770LIFETIME LIMITED WARRANTY FOR BOSCH TANKLESS WATER HEATERS14.2 Limited warranty for C 1210 ESC commercial modelMODELS COVEREDThis limi

6 720 644 887LIFETIME LIMITED WARRANTY FOR BOSCH TANKLESS WATER HEATERS71INCLUDING, WITHOUT LIMIITATION, INJURY ORDAMAGE TO PERSONS OR PROPERT

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6 720 644 8878Appliance details2.4 General rules to follow for safe operationB 1. You must follow these instructions when youinstall your hea

6 720 644 887Appliance details92.5 Dimensions and minimum installation clearancesFig. 6 Dimensions1 On/Off button2 Reset button3 Program button4 Power