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Bosch GWH 2700 ES LP User Manual

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MODEL GWH 2700 ES NG and GWH 2700 ES LP -
Temperature Modulated with Electronic Ignition
Suitable for heating potable water only
Not approved for space heating purposes
(Intended for variable flow applications)
GWH 2700 ES NG - Natural Gas
GWH 2700 ES LP - 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
vapor 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.
• If you cannot reach your gas supplier, call the fire
• Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.


Table of Contents

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  Summary of Contents for Bosch GWH 2700 ES LP

  • Page 1 MODEL GWH 2700 ES NG and GWH 2700 ES LP - INDOOR MODEL Temperature Modulated with Electronic Ignition Suitable for heating potable water only Not approved for space heating purposes (Intended for variable flow applications) GWH 2700 ES NG - Natural Gas...
  • Page 2: Table Of Contents

    Electrical connections Electrical power supply Position of the fuses in control unit Operation instructions LCD Display functions For your safety read before operating your water heater Power Temperature selection Use of optional remote control accessory (part no. TSTAT2) Operation Reset button...
  • Page 3: Warning

    Warning: If a water heater is installed in a closed water supply system, such as one having a backflow preventer in the cold water supply line, means shall be provided to control thermal expansion.
  • Page 4: Appliance Details

    B The anti freeze kit will not protect plumbing outside the appliance from freezing. Precautions should be taken. B Always drain the water heater if it will be exposed long conditions. See Section 6.2 Winterizing for seasonal use.
  • Page 5: Specifications (Technical Data)

    Specifications (Technical data) Approved in US/Canada Capacity Maximum flow rate: 7.15 GPM (27 l/min) at a 45°F (25°C) rise. Maximum output 160,500 Btu/h (47.0 kW) Maximum input 199,000 Btu/h (58.3 kW) Efficiency in % Thermal efficiency > 82% Min. Input 19,900 Btu/h (5.8 kW) Temperature Control Selection range: 100°F (38°C) - 140°F (60°C)
  • Page 6: Unpacking The Heater

    Appliance details Unpacking the heater 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.
  • Page 7: General Rules To Follow For Safe Operation

    (not supplied with heater) during any pressure testing at pressures in excess of ½ Psig (3.5 kPa). B 6. Keep water heater area clear and free from combustibles and flammable liquids. Do not locate the heater over any material which might burn.
  • Page 8: Installation Clearances

    Appliance details Dimensions and Minimum installation clearances r e s e t Fig. 6 Dimensions On/Off button Reset button Program key Power ON or stand-by LED LCD display Up button Down button Fig. 7 Minimum clearances Note: For servicing access, a 2ft clearance to front cover is recommended.
  • Page 9: Installation Instructions

    Installation instructions Tools required for installation • Philips head screwdriver • Flat head screwdriver • Adjustable wrench • Level • Thermometer • Standard plumbing tools • Manometer • Drill • Pipe wrench • Adjustable pliers • Pipe fitting tools • Hacksaw •...
  • Page 10 Installation instructions Horizontal venting systems only: An optional stainless concentric vent/air intake termina- tion can be used to provide only one penetration point through the exterior wall (see Fig. 8, 9 & 10). The con- centric vent/air intake kit can be ordered from your local wholesaler.
  • Page 11 Condensate drain requirements An external condensate drain (not supplied with the heater) must be installed under the following conditions: • All vertical terminating vent installations. • Horizontal terminating vent installations where the total linear vent length is greater than 10 feet (3.1 m). •...
  • Page 12 Installation instructions Required direct vent terminal clearances (twin pipe / concentric penetration) Fig. 11 Clearance above grade, veranda, porch, deck or balcony Clearance to window or door that may be opened Clearance to permanently closed window Vertical clearance to ventilated soffit located above the vent terminator within a horizontal distance of 2 feet (61cm) from the center line of the terminator Clearance to unventilated soffit...
  • Page 13 Required other than direct vent terminal clearances (single pipe penetration) Fig. 12 Clearance above grade, veranda, porch, deck or balcony Clearance to window or door that may be opened Clearance to permanently closed window Vertical clearance to ventilated soffit located above the vent terminator within a horizontal distance of 2 feet (61cm) from the center line of the terminator Clearance to unventilated soffit...
  • Page 14 Installation instructions 3.3.3 Venting configuration examples Below are approved examples of horizontal venting installations. HORIZONTAL RUN 1/4" PER FOOT DOWN TO TERMINATOR. CONDENSATE DRAIN Fig. 13 Horizontal side wall venting installation (single pipe penetration)* * Warning: for non-freezing climates only! Important: Note: Pitch horizontal runs down toward the heater, except horizontal run between last elbow and termina-...
  • Page 15 Fig. 17 Vertical venting installation (twin pipe penetra- tion) 10' MIN. 2' MIN. 3' MIN. CHIMNEY MAY BE INSULATED IF NECESSARY HORIZONTAL RUN 1/4" RISE/FT HANGER STRAP ELBOW HOSE CLAMP CONDENSATE DRAIN APPLIANCE Fig. 18 Vertical venting installation - Masonry Chim- ney (combustion air piping not shown) 6 720 608 542 3.3.4...
  • Page 16 Installation instructions 3.3.5 Condensate drain installation Note: Do not install condensate drain in areas where it may freeze. 1. Install condensate drain as close to heater as possi- ble. 2. Use 3/8" ID high temperature silicone tube to con- nect to condensate drain port. Do not use copper pip- ing for any portion of the condensate drain.
  • Page 17 3.3.6 Fan speed adjustment IMPORTANT! Installation adjustment: After installing the water heater, the fan speed values for minimum power (P2) and maximum power (P1) may need adjustment due to variations in altitude and vent pipe length. Failure to make necessary adjustments to fan speed values may result in improper operation of the appliance.
  • Page 18 Installation instructions Altitude Total (above sea equivalent level) vent length 5.5 - 32 ft 0 - 2000 ft (0 - 610 m) 33 - 57 ft 5.5 - 32 ft 2000 - 4500 ft (610 - 1372 m) 33 - 57 ft 5.5 - 32 ft 4500 - 8000 ft (1372 - 2439 m)
  • Page 19 Attention residents of the Commonwealth of Massachusetts: In the Commonwealth of Massachusetts the following regulation went into effect on 12/30/2005: (a) For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished...
  • Page 20: Combustion Air Requirements

    If a single pipe installation is utilized, follow guidelines below for providing adequate combustion air for the water heater as well as any other appliances that may consume air in the space. Always follow local codes if they are more stringent.
  • Page 21: Proper Location For Installing Your Heater

    Proper location for installing your heater Carefully select the location of the water heater. For your safety and for proper heater operation, you must provide combustion air to the heater and a proper exhaust vent system. Follow the guidelines below: B 1.
  • Page 22: Gas Piping & Connections

    Installation instructions 6720608158-64.1AL Fig. 25 Leveling the mounting bracket on the studs 6720608158-05. 1 AL 6720608158-05. 1 AL Fig. 26 Mounting the heater Warning: Appliance must be installed vertically. Gas piping & connections Before connecting the gas supply, check the rating plate on the right side of the heater to be sure that the heater is rated for the same gas to which it will be connected.
  • Page 23 Once connections are made, check for gas leaks at all joints. Apply some gas leak detection solution to all gas fittings. Bubbles are a sign of a leak. A combustible gas detector may also be used to detect for leaks. Danger: If you have a leak, shut off the gas.
  • Page 24 Installation instructions FOR NATURAL GAS Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop of 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 2700 ES (example: ¾”...
  • Page 25: Water Connections

    B When facing the heater, the ¾” cold connection is on the bottom right and the hot connection is on the bot- tom left. Centrally locating the water heater is recom- mended to keep hot water distribution times even throughout the structure.
  • Page 26: Domestic Hot Water Recirculation

    The location of the PRV must be readily accessible for servicing or replacement, and be mounted as close to the water heater as possible. See Fig. 31. To install the PRV, a suitable fitting connected to an extension on a “T”...
  • Page 27: Measuring Gas Pressure

    Confirm gas pressure upon installation. Connecting manometer B Shut off gas supply at installer supplied shutoff valve for this water heater. B Remove front cover and locate inlet gas pressure measuring point (see Fig. 34). B Loosen screw inside left test point fitting (do not remove) and connect manometer tube to test point.
  • Page 28: Electrical Connections

    Code, CSA C22.1 Part 1. Do not rely on the gas or water piping to ground the metal parts of the heater. The water heater requires an electrical power supply from a 120VAC / 60Hz properly rated receptacle and must be properly grounded.
  • Page 29: Operation Instructions

    Operation instructions Fig. 38 On/Off button Reset button Program Key LCD display Up button Down button LED - Power On indicator or Stand-by LCD Display functions Warning: Do not use any cleaning or corrosive agent to clean the window. Fig. 39 Power bar indicator Fig.
  • Page 30: Your Water Heater

    Note: The water heater, running at minimum BTU, may still achieve temperatures above the desired set temperature. Low flowing fixtures are the leading cause of this type of temperature overshoot.
  • Page 31: Operation

    Fig. 47 Remote control The wireless remote control accessory (Fig. 71, component 13) and the temperature selector buttons on the front of the water heater operate identically. Contact your distributor to order the remote control accessory. Modification of the water heaters interior control unit (Fig.
  • Page 32: Maintenance And Service

    (see Table 13, page 25), the heat exchanger should be periodically flushed with a descaling solution. Scale build up will shorten the life of the water heater and damage resulting from scale is not covered under warranty. Refer to section 6.3 for detailed instructions exchanger.
  • Page 33: Mineral Scale Build-Up

    OFF the heater and unplug power supply cord. The display should be blank. 2. Shut off gas supply to heater. 3. Shut off the water supply to the water heater using installer supplied shutoff valve. 4. Open hot water taps to drain the plumbing system. If...
  • Page 34 Maintenance and service Static Gas Pressure: “ WC P1 Operating Pressure: “ WC The P1 minimum operating gas pressure is 3.5" WC for Natural Gas and 8" WC for Propane. Do not proceed in adjusting CO until pressure is at or above these levels, but not to exceed 10.5”...
  • Page 35 range (%) Nat. Gas max. input 7.5 % - 8.1 % min. input 2.3 % - 2.6 % LP Gas max. input 8.7 % - 9.3 % min. input 2.7 % - 3.0 % * Values above are for climate controlled conditions. Inputs such as gas pressure, heating value of the gas, humidity and temperature of combustion air all impact CO and CO...
  • Page 36: Program Values

    Maintenance and service Program values This section describes details on programming the appliance. For most applications the factory default values will robust and stable operation. Only adjust the factory settings if the installation requires changes as indicated in the appropriate section of this manual. Program Description Maximum Power...
  • Page 37: Control Board Diagnostics

    Control board diagnostics 1. Turn on/off switch on water heater to off (O) position. 2. Press and hold the program ( turning the on/off switch to the on (I) position. The display will cycle through a startup procedure including the software version.
  • Page 38: Troubleshooting

    To check for a plumbing crossover, shut off the cold water supply to the water heater. Then open all of the hot water taps served by the heater. Wait 10 minutes and check for water flow at taps. There should be no water flowing.
  • Page 39: Low Water Flow/Pressure

    2. Unbalanced pressure in water lines. Any restriction in the water heater, such as a clogged inlet filter screen, can result in unequal pressures between the cold and hot water lines. In such cases, when mixing in the...
  • Page 40 Troubleshooting 5. Lack of adequate gas pressure. Inadequate gas pressure will cause the fuel-to-air mixture (CO 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 27 Measuring Gas Pressure.
  • Page 41: Problem Solving

    5. Unplug heater and check the two main plug connections inside the control board. 1. Check “P7” mode: water heater requires setting “NC”. 2. Check jumper and connection on sensor at upper right hand corner of heat exchanger.
  • Page 42 In this case, the error code should not happen more than once or twice. Turn off the water heater. Turn water heater back on and try resetting error code. Use the reset button ( codes.
  • Page 43 5. In areas where water has a high mineral content, periodic descaling may necessary, see 6. Unplug power supply cord to the water heater. Open a hot water tap for several minutes to allow cold water to pass through heat exchanger. Close hot water tap and disconnect lead wires to overheat sensor.
  • Page 44 If heater still faults with EA error code, have a licensed gas technician properly purge air out of the gas line leading to the water heater. 4. Check three wire connections to ignition group on the lower front of the heat exchanger are secure.
  • Page 45: 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 Flue gas limiter Heat exchanger overheat sensor (ECO) Gas valve Jumper resistance Water valve Primary fan ON/OFF switch...
  • Page 46: Sensor Resistance Charts

    Sensor resistance charts Sensor resistance charts 2 2 2 2 17 2 12 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 12 7 12 2 10 7 10 2...
  • Page 47 3 0 2 2 9 7 2 9 2 2 8 7 2 8 2 2 7 7 2 7 2 2 6 7 2 6 2 2 5 7 2 5 2 2 4 7 2 4 2 2 3 7 2 3 2 2 2 7 2 2 2...
  • Page 48: Gwh 2700 Es Functional Scheme

    GWH 2700 ES Functional scheme GWH 2700 ES Functional scheme Fig. 63 Functional scheme 6 720 608 542...
  • Page 49: Interior Components Diagram And Parts List

    Interior components diagram and parts list 12.1 Interior components Fig. 64 Components Flue gas collector Heat exchanger Flame sensor Primary fan (Mixer) Outlet temperature sensor LCD display On/Off button Reset button Program key Flue gas limiter Heat exchanger overheat sensor (ECO) 6 720 608 542 Interior components diagram and parts list Ignition electrodes...
  • Page 50 Interior components diagram and parts list Fig. 65 Appliance overview 6 720 608 542...
  • Page 51: Components Diagram

    12.2 Components diagram 12.2.1 Group 1 Fig. 66 Components Diagram Item Description Front cover Cover shield Trade mark badge Cover screw Combustion cover Combustion cover gasket Observation window Holding bracket Screw Table 21 6 720 608 542 Interior components diagram and parts list Item Reference 8 705 431 286...
  • Page 52 Interior components diagram and parts list 12.2.2 Group 2 Fig. 67 Components Diagram Item Description Heat exchanger Heat exchanger top gasket Flue gas collector Overheat sensor (ECO) Heat exchanger bottom gasket Table 22 Item Reference 8 705 406 422 8 704 701 052 8 705 700 153 8 707 206 204 Table 22...
  • Page 53 12.2.3 Group 3 Fig. 68 Components Diagram Item Description Main burner Burner gasket Primary fan Backflow temperature sensor Washer Fan mount nut Secondary fan - NG Secondary fan - LPG Screw Gas / Air Mixer Table 23 6 720 608 542 Interior components diagram and parts list Item Description...
  • Page 54 Interior components diagram and parts list 12.2.4 Group 4 Fig. 69 Components Diagram Item Description Gas valve Pressure tapping Washer Pressure balance tube Pressure balance nut Gas supply pipe Gas valve washer Table 24 Item Description Reference Gas filter 8 707 021 019 Gasket 8 703 404 219 Gas / Fan connector...
  • Page 55 12.2.5 Group 5 Fig. 70 Components Diagram Item Description Water valve with engine O-ring Cold water pipe Pipe connection clip Hot water pipe Temperature sensor Outlet fitting Inlet / Outlet washer Wireform spring Table 25 6 720 608 542 Interior components diagram and parts list Item Description Reference...
  • Page 56 Interior components diagram and parts list 12.2.6 Group 6 Fig. 71 Components Diagram Item Description Control unit Fuse T2.5A Fuse T1.6A Power supply cables Power supply cord Fan cables Wire harness Jumper Table 26 Item Reference 8 707 207 257 1 904 521 342 8 700 609 008 8 704 401 371...
  • Page 57: 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 58: Limited Warranty

    (3) years from date of original installation and operation. If the water heater is installed in other than a single family dwelling, this heat exchanger warranty is limited to two (2) years from date of original installation and operation.
  • Page 59 Limited Warranty 6 720 608 542...
  • Page 60 Installer Checklist to be completed by installer upon installation Serial Number Gas Pressure Reading* Building Water Pressure Installing Company Installer name Address Phone * See Chapter 3.12, page 27 and gas pressure table (to be filled out by installer) Installation manual should be left with the owner after the installation is tested and completed Replacement Parts available from: BOSCH THERMOTECHNOLOGY CORP.

This manual is also suitable for:

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