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BOSCH GWH 715 ES Installation Instructions Manual

Temperature modulated with electronic ignition.
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GWH 715 ES
Temperature Modulated with Electronic Ignition
Suitable for heating potable water only - Not approved for space heating purposes
(Intended for variable flow applications)
GWH 715 ES - Natural Gas
GWH 715 ES - Liquefied Petroleum (LP) Gas
Warning: If the information in this manual is not
followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or additional information consult a
qualified installer, service agency or the gas
In the Commonwealth of Massachusetts this
product must be installed by a licensed plumber or
gas fitter.
Upon completion of the installation, these
instructions should be handed to the user of the
appliance for future reference.
What to do if you smell gas
• Close gas valve. Open windows.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.


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   Summary of Contents for BOSCH GWH 715 ES

  • Page 1

    Suitable for heating potable water only - Not approved for space heating purposes (Intended for variable flow applications) GWH 715 ES - Natural Gas GWH 715 ES - Liquefied Petroleum (LP) Gas Warning: If the information in this manual is not What to do if you smell gas followed exactly, a fire or explosion may result •...

  • Page 2: Table Of Contents

    Winterizing for seasonal use Appliance details Mineral scale build-up Features Adjusting CO2 GWH 715 ES Specifications (Technical data) 4 Program values Unpacking the GWH 715 ES heater Control board diagnostics General rules to follow for safe operation Dimensions and Minimum installation...

  • Page 3: Warning

    Warning Warning FCC: This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) For your safety This device may not cause harmful interference, and (2) Do not store or use gasoline or other flammable, this device must accept any interference received, combustible or corrosive vapors and liquids in the including interference that may cause undesired...

  • Page 4: Appliance Details

    • Outdoor kit (PTOK) Water • External water filter (8703305356). • Hot water connection (inches) - ¾” BOSCH is constantly improving its • Cold water connection (inches) - ¾” products, therefore specifications are • Water valve material: Polymer (PPS) (Polypropylene subject to change without prior notice.

  • Page 5: Unpacking The Gwh 715 Es Heater

    Please complete and return the enclosed product proper calibration of appliance. (see page registration card. 24). The GWH 715 ES is not approved or designed for: • Manufactured (mobile) homes, boats or any mobile installation. • Use above 4500ft A.S.L. altitude.

  • Page 6: General Rules To Follow For Safe Operation

    Appliance details To remove front cover General rules to follow for safe operation B Loosen the two Philips head screws located on bottom rear of cover (see Fig. 3). B 1. You must follow these instructions when you install your heater. In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/ NFPA 54.

  • Page 7: Dimensions And Minimum Installation Clearances

    Appliance details Dimensions and Minimum installation clearances Fig. 6 Dimensions On/Off button Reset button Model GWH 715 ES Program key TOP (A) 12” Power ON or stand-by LED LCD display FRONT (B) 1” Up button Down button BACK 0” SIDES 1”...

  • Page 8: Installation Instructions

    • Standard plumbing tools • Manometer. Heater placement and clearances The GWH 715 ES is approved for installation on a Introduction combustible wall (see chapter 3.5 Mounting Please follow these instructions. Failure to follow installation) provided the floor covering below instructions may result in: the heater is noncombustible.

  • Page 9

    Installation instructions If wall is sheathed with plaster or drywall, it is recommended that two support boards, either 1”x4” or 1/2" (minimum) plywood first be attached across a pair of studs, see Fig. 8, page 9. B Secure the wall mounting bracket provided with the heater to the wall surface.

  • Page 10: Gas Piping & Connections

    Installation instructions Gas piping & connections Once connections are made, check for gas leaks at all joints. Apply some gas leak detection solution to all gas Before connecting the gas supply, check the rating fittings. Bubbles are a sign of a leak. A combustible gas plate on the right side of the heater to be sure that the detector may also be used to detect for leaks.

  • Page 11

    0.3” in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands. Follow boxed numbers for piping just one GWH 715 ES (example: ¾” B.I. Natural Gas pipe for 10 ft (3.0m). will handle 278,000 btu’s (81.5 kWh). For multiple appliances combine the total maximum btu input load and then refer to applicable chart below.

  • Page 12: Water Connections

    For water analysis data call your local water department, or if on a well, have well water analyzed periodically. If Fig. 14 water quality exceeds one or more of the values specified below, Bosch recommends installing a water conditioner or softener. Description Max. Levels 6.5 - 8.5...

  • Page 13: Recirculation Application

    Connecting the pressure relief valve (PRV) Recirculation application A listed pressure relief valve supplied with the heater The GWH 715 ES Protankless water heater is must be installed at the time of installation. No valve is approved for domestic hot water recirculation. The to be placed between the PRV and the heater.

  • Page 14

    Fuel Gas Code. Consult a HVAC specialist if your air Twin pipe infiltration rate is questionable. The GWH 715 ES is designed as a sealed combustion The space must have two permanent openings, one appliance. It is recommended that the combustion air commencing within 12 inches of the top and one be provided by a dedicated 3”...

  • Page 15: Venting

    3” Z flex Protech Heat Fab Bosch Water Heating will not be VENTING responsible for improperly installed 3” appliances. Horizontal 2SVSTB03 FSTB3 9390 TEE Terminal 3.11.1 Vent material and specifications...

  • Page 16

    (AL29-4C) vent Vent Safety System pipe. The GWH 715 ES will shut down if inadequate exhaust venting is detected or a lack of combustion air is provided to the unit; see troubleshooting section on 6 720 608 158...

  • Page 17

    Installation instructions 3.11.3 Condensate drain requirements Room sealed installation (TWIN PIPE SYSTEM) A condensate drain must be installed under the Installing this water heater as a room sealed (TWIN following conditions: PIPE SYSTEM) is the recommended method. Contact your dealer for available vent termination kits and vent •...

  • Page 18

    Installation instructions The exhaust vent system must vent directly to the Warning: Approved terminators must outside of the building and an adequate amount of be used for inlet and exhaust vent indoor combustion air must be provided for this systems to prevent rain from entering installation.

  • Page 19

    Example Adjusting the minimum power (P2) based on the total Exhaust combined vent length. After installing the GWH 715 ES, the minimum power Straight section length 22 = fan speed must be selected to compensate for variation in vent pipe length.

  • Page 20

    Installation instructions To select fan speed: B Press ON/OFF button into OFF. B Press and hold "Program" button and press ON/OFF button to turn appliance ON. Fig. 27 B As soon as '188' is displayed, release "Program" button , and the display should read P2. B Press to choose the fan speed suitable with your installation, see Table 10.

  • Page 21

    Installation instructions Recommended exhaust vent terminator position Fig. 28 Ref. Description Minimum distance Directly below an opening; operable windows, doors and any non- 36 in (twin pipe installation) mechanical fresh air openings 48 in (single pipe installation) Below a gutter, sanitary pipework or eaves 24 in Below a gutter, sanitary pipework or eaves, protected by metal 12 in...

  • Page 22

    Installation instructions Venting configuration examples Fig. 31 Above the roof clearance requirements from rain cap (combustion air piping not shown) Fig. 29 Horizontal side wall venting installation (combustion air piping not shown) Important: Note: Pitch horizontal sections down to the heater.

  • Page 23

    Installation instructions Attention residents of the Commonwealth of Massachusetts: In the Commonwealth of Massachusetts the following signage installed in accordance with the provisions of regulation went into effect on 12/30/2005: 248 CMR 5.08(2)(a)1 through 4. (a)For all side wall horizontally vented gas fueled (b)EXEMPTIONS: The following equipment is exempt equipment installed in every dwelling, building or from 248 CMR 5.08(2)(a)1 through 4:...

  • Page 24: Measuring Gas Pressure

    Installation instructions B Record lowest operating gas pressure reading in 3.12 Measuring gas pressure table 13. Confirm gas pressure upon installation. Gas pressures lower than 4" W.C. for Natural Gas or 9" W.C. for LPG will result in insufficient degree rise to the Connecting manometer hot water being used, reduced hot water volume, B Shut off gas supply at installer supplied shutoff valve...

  • Page 25: Electrical Connections

    Fig. 36, pos. 2. The GWH 715 ES requires an electrical power supply B Check the fuses in the printed circuit board, see Fig. from a 120VAC / 60Hz circuit (with a dedicated outlet) 36, pos.

  • Page 26: Operation Instructions

    Operation instructions Operation instructions Fig. 37 On/Off button Reset button Program Key LCD display Up button Down button LED - Power On indicator or Stand-by Description LCD display Fig. 41 Lock indicator (only with remote control) Warning: Do not use any cleaning or corrosive agent to clean the window.

  • Page 27: For Your Safety Read Before Operating Your Water Heater

    B If you cannot reach your gas supplier, call the fire adjusted on the front control panel of the heater. department. The GWH 715 ES has an electronically controlled gas valve that modulates the burner input in response to C. Use only your hand to press the on/off control switch.

  • Page 28: Operation

    Operation instructions Use of optional remote control accessory (part no. TSTAT2) Fig. 51 Reset button If the problem persists, contact your installer. Program button Program button can be used on the appliance and in the Fig. 48 Remote control remote control. The wireless remote control accessory (Fig.

  • Page 29: Maintenance And Service

    Maintenance and service Maintenance and service Pressure relief valve Warning: Always turn off the electrical • Manually open the pressure relief valve to ensure power supply, turn off the manual gas proper operation. shut off valve and turn off the water shut off valves whenever servicing.

  • Page 30: Mineral Scale Build-up

    Maintenance and service 5. Open service valves (if available) or disconnect inlet isolation valve and flush heat exchanger with clean and outlet water pipes from the water heater. Place a water. small bucket underneath the water heater to catch 15.Shut cold water shutoff valve and reconnect hot residual water remaining inside the water heater.

  • Page 31

    Maintenance and service A. Once Gas Pressure is adequate Note: When making adjustments, make sure combustion cover is installed. B Press ON/OFF button to turn off the heater. B Remove brass flat head screw on the exhaust collar Max. CO range (%) as seen in Fig.

  • Page 32

    Maintenance and service D. Returning to Service: 1. Return slotted screw cover to original position and tighten philips screw. 2. Reinstall Torx cover. 3. Remove CO analyzer probe and reinstall flathead screw with gasket in exhaust collar. 4. Press ON/OFF button to turn OFF the heater and then turn ON the heater.

  • Page 33: Program Values

    3.11.4, page 19 Remote Con- see chapter 5.5, page 28 trols installed Access to Diag- see chapter 6.6, page 34 nostic Mode Cascade Mode contact Bosch for details Temperature °F °F °C Unit Appliance Type Condensing / Non-condensing*...

  • Page 34: Control Board Diagnostics

    Maintenance and service Control board diagnostics Diagnostic menu 1. Turn on/off switch on water heater to off (O) position. Entry/Exit into sub-modes B Press and hold the program ' ' button while Set-point temperature turning the on/off switch to the on (I) position. The display will cycle through a startup procedure Inlet water temperature (°F) including the software version.

  • Page 35: Troubleshooting

    Troubleshooting Troubleshooting and mixing valves are common causes of plumbing Warning: If you are unable to perform crossovers. the tasks listed below, or need 8. With the ON/OFF switch turned to OFF (O) position additional assistance please contact and the power supply cord unplugged, remove the your original installer or licensed gas unit's front cover (See Page 6.

  • Page 36: Low Water Flow/pressure

    Troubleshooting unintentionally mix cold water with the hot water 2. Unbalanced pressure in water lines. Any restriction in leaving the heater. The end result is a cooler water the water heater, such as a clogged inlet filter screen, temperature than desired. To check for a plumbing can result in unequal pressures between the cold crossover, shut off the cold water supply to the water and hot water lines.

  • Page 37

    Troubleshooting intake and exhaust may cause unstable burner flames and noise. 5. Lack of adequate gas pressure. Inadequate gas pressure will cause the fuel-to-air mixture (CO ) to be out of adjustment. This will result in unstable burner flames and noise. Ensure gas pressure is in accordance with specifications in section 3.12, page 24 Measuring Gas Pressure.

  • Page 38: Problem Solving

    Problem solving Problem solving Error code diagnostics To remove error code from the display, press the reset button. Display Cause Solution Fault in the flue gas limiter. 1. Check continuity of the flue gas limiter (see Fig. , page Temperature above 230°F Go to steps two and three to determine air box temperature...

  • Page 39

    4. Check supply voltage. It must be 120VAC and properly grounded. 5. Possible defective control unit call Bosch Water Heating for further instructions. Primary fan rotation too low on 1. Disconnect power supply cord and check wire connections on startup.

  • Page 40

    4. Call Bosch Water Heating for further instruction. Overheat sensor (ECO) open 1. Disconnect power supply cord and check wire connections on circuit...

  • Page 41

    The voltage should measure 24VDC between the left pair of wires and 24VDC between the right pair of wires when the unit is operating. If voltage is not proper, contact Bosch Water Heating for further instruction. 3. Gas valve may be defective, contact Bosch Water Heating for further instrucation.

  • Page 42: Electrical Diagram

    Electrical diagram Electrical diagram Fig. 59 Electrical scheme Intlet water temperature sensor Outlet water temperature sensor Backflow temperature sensor Cascading output connection Cascading input connection Ionization sensor Water flow sensor Overheat sensor (ECO) Flue gas limiter Gas valve Water valve Primary fan ON/OFF switch Secondary fan...

  • Page 43: Sensor Resistance Charts

    Sensor resistance charts Sensor resistance charts Outlet NTC characteristics 2 2 2 2 17 10 5 2 12 10 0 2 0 7 2 0 2 19 7 19 2 18 7 18 2 16 7 16 2 14 7 14 2 13 7 13 2...

  • Page 44

    Sensor resistance charts Back Flow characteristics 3 0 2 2 9 7 2 9 2 14 5 2 8 7 2 8 2 14 0 2 7 7 2 7 2 13 5 2 6 7 2 6 2 13 0 2 5 7 12 5 2 5 2...

  • Page 45: Gwh 715 Es Functional Scheme

    GWH 715 ES Functional scheme GWH 715 ES Functional scheme Fig. 63 Functional scheme 6 720 608 158...

  • Page 46: Interior Components Diagram And Parts List

    Interior components diagram and parts list Interior components diagram and parts list 12.1 Interior components Fig. 64 Components Flue gas collector Ignition electrodes Heat exchanger Observation window Flame sensor Backflow temperature sensor Primary fan (Mixer) Secondary air fan Outlet temperature sensor Gas valve LCD display Water valve with engine and temperature sensor...

  • Page 47

    Interior components diagram and parts list Fig. 65 Appliance overview 6 720 608 158...

  • Page 48: Components Diagram

    Interior components diagram and parts list 12.2 Components diagram 12.2.1 Group 1 13 15 6720902973.AA JF Fig. 66 Components Diagram Item Description Reference Item Description Reference Combustion cover clip 8 701 201 032 Front cover 8 705 431 264 Grommet set 8 710 203 039 Cover shield 8 705 506 857...

  • Page 49

    Interior components diagram and parts list 12.2.2 Group 2 6720902974.AA JF Fig. 67 Components Diagram Item Description Reference Item Description Reference Site window 8 701 000 401 Heat exchanger 8 705 406 356 Ignition group 8 701 302 249 Heat exchanger top gasket 8 704 701 052 Heat exchanger O-ring 8 700 205 147...

  • Page 50

    Interior components diagram and parts list 12.2.3 Group 3 Fig. 68 Components Diagram Item Description Reference Item Description Reference Air duct O-ring 8 700 205 149 Main burner 8 708 120 642 Venturi 8 700 306 226 Burner gasket 8 704 701 087 O-ring 8 700 205 224 Primary fan...

  • Page 51

    Interior components diagram and parts list 12.2.4 Group 4 6720902976.AA JF Fig. 69 Components Diagram Item Description Reference Item Description Reference Gas filter 8 700 507 002 Gas valve 8 707 021 019 Gasket 8 704 701 085 Pressure tapping 8 703 404 219 Gas / Fan connector 8 705 202 140...

  • Page 52

    Interior components diagram and parts list 12.2.5 Group 5 6720902977.AA JF Fig. 70 Components Diagram Item Description Reference Item Description Reference Inlet fitting 8 703 305 348 Water valve with engine 8 708 505 024 O-ring 8 700 205 157 O-ring 8 700 205 147 Watervalve clip...

  • Page 53

    Interior components diagram and parts list 12.2.6 Group 6 Fig. 71 Components Diagram Item Description Reference Item Description Reference Electrode cables 8 704 401 346 Control unit 8 707 207 257 Flue gas limiter 7 709 003 665 Fuse T2.5A 1 904 521 342 Cascading kit (optional) 7 709 003 617...

  • Page 54: Protecting The Environment

    Protecting the environment Protecting the environment Packing The packing box may be fully recycled as confirmed by the recycling symbol Components Many parts in the heater can be fully recycled in the end of the product life. Contact your city authorities for information about the disposal of recyclable products.

  • Page 55: Limited Warranty

    General costs associated with service, removal or re-installation of the original water heater or a replaced water heater. BOSCH PRO tankless water heaters are warranted by the Manufacturer (BOSCH) through BBT North NOTE: the water heater must be free of America.

  • Page 56

    Installation manual should be left with the owner after the installation is tested and completed Replacement Parts available from: BBT North America Corporation Bosch Group BBT Termotecnologia Portugal, S.A. Bosch Water Heating Estrada de Cacia 50 Wentworth Avenue 3801 - 856 Aveiro - PORTUGAL Londonderry, NH 03053 Tel.

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