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GWH 260 PN
Flow Modulated with Standing pilot
Suitable for heating potable water only - Not approved for space heating purposes
(Intended for variable flow applications with steady cold water inlet temperatures)
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.
• 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 260 PN

  • Page 1

    GWH 260 PN INDOOR MODEL Flow Modulated with Standing pilot Suitable for heating potable water only - Not approved for space heating purposes (Intended for variable flow applications with steady cold water inlet temperatures) GWH-260-PN-N GWH-260-PN-L Warning: If the information in this manual is not...

  • Page 2: Table Of Contents

    Index Index Warning Warning Appliance details GWH 260 PN specifications (Technical data) Warning: The heater must be isolated Unpacking the GWH 260 PN heater from the gas supply piping system General rules to follow for safe operation during any pressure testing of that...

  • Page 3: Appliance Details

    • Weight: 26 pounds (12 kg). GWH 260 PN: 2.6 GPM Gas types Maximum output Natural Gas. GWH 260 PN: 58 400 Btu/hr LP Gas Maximum input Safety devices GWH 260 PN: 74 900 Btu/hr • Flame failure device (ionization thermocouple) Efficiency in % •...

  • Page 4

    The GWH 260 PN is not approved or designed for: BOSCH is constantly improving its • Manufactured (mobile) homes, RV's or boats products, therefore specifications are subject to change without prior notice.

  • Page 5

    Dimensions in Inches and (mm) Heat exchanger Burner Dimensions inches Temperature control (mm) Water valve Gas connection GWH 260 PN Output control Front cover 12.20” (310) Hole for fixing to wall 22.83” (580) Exhaust pipe to connector Draft diverter with flue gas monitor 9”...

  • Page 6: Heater Placement And Clearances

    Please contact Bosch Water Heating with any Heater placement and clearances questions. The GWH 260 PN is design certified for installation on Proper location for installing your a combustible wall (see 3.4 Mounting installation) heater provided the wall is not covered with carpet or other fabric material.

  • Page 7

    Screws Incandescent particle tray Fig. 5 Incandescent particle tray illustration Mounting heater. The GWH 260 PN is design certified for mounting on a wall. Warning: B Do not install this appliance on a carpeted wall. The heater must be mounted on a wall using appropriate anchoring materials.

  • Page 8

    Fuel Gas Code for complete information. In buildings of tight construction all air should be taken from outside. The BOSCH PRO water heater holds cold water in its copper heat exchanger and water valve when not in use. Because of this, any cold air that comes down through the unit's vent pipe is capable of freezing these components.

  • Page 9

    Installation instructions Venting Keep the horizontal section short and avoid too many elbows. The maximum horizontal run allowed is half of the total vertical vent height; horizontal vent connectors Danger: Do not reduce the vent pipe and elbows are not to be considered in the total gas size.

  • Page 10

    Installation instructions Masonry chimney GAS VENT TERMINATIONS FOR LISTED VENT CAPS Masonry chimneys shall be built and installed in Roof pitch H (minimum) feet meters accordance with NFPS 211 or local codes. A minimum Flat to 6/12 0.30 4" diameter gas vent pipe (metal double wall Type B), 6/12 to 7/12 1.25 0.38...

  • Page 11

    Fig. 12 Installation of Gas Pressure Regulator Note: The gas pressures specified below refer to Note: The GWH 260 PN comes with a gas pressure pressures taken at the pressure tap on the gas inlet pipe regulator. Failure to install or altering the gas pressure just above the regulator.

  • Page 12

    Follow boxed numbers for piping just one GWH 260 PN (example: ¾” B.I. Natural Gas pipe for 20 ft (6. 1 m). will handle 190,000 btu’s (55.7 kWh). For multiple appliances combine the total btu input load and then refer to applicable chart below.

  • Page 13: Measuring Gas Pressure

    Installation instructions Measuring gas pressure or suitably rated stainless steel flex line piping be used for at least three feet before and after the heater (follow Connecting manometer local codes if more stringent). Never sweat any rigid piping directly to or beneath the water connections or B Shut off gas.

  • Page 14: Recirculation Application

    B Do not touch any electric switch; do not use any thermostatically controlled operation of the pump is phone in your building. commonly done. The GWH 260 PN should be plumbed B Immediately call your gas supplier from a neighbors in line before the mini-tank water heater. Contact Bosch phone.

  • Page 15: Lighting Instructions

    Note: If main burner should fail to ignite, make sure pilot is burning. If not, repeat lighting steps. Note: The GWH 260 PN operates in two modes. See Fig. 18 SETTING THE WATER TEMPERATURE. B Fully depress gas valve button.

  • Page 16: Setting The Water Temperature

    The hottest position is the highest flame position all the way to the right. The GWH 260 PN has a gas control that modulates burner input in response to flow. Its purpose is to ensure that the hot water temperature will remain steady, although the water flow demand might vary.

  • Page 17: Maintenance And Service

    Separate the two halves of the water valve by removing the five screws on the left side of the water valve. Apply The GWH 260 PN requires periodic maintenance. The lithium or faucet & valve grease to the pushrod and o- below time maintenance intervals should kept the unit ring.

  • Page 18: Main Burners

    Check for vent assembly blockage or combustion air blockage on the underside of the unit. Mineral scale build-up The GWH 260 PN, when operated at lower temperatures settings, does not accumulate mineral build-up. If however, the heater is used at the higher temperature settings and the water has a high mineral content, periodic descaling may be necessary.

  • Page 19: Troubleshooting

    Maxitrol regulator is in the upright position. The pilot circuit. The GWH 260 PN does not have a arrow on the back of the regulator should point in the thermostat. If inlet water is preheated, the unit will same direction as gas flow.

  • Page 20: Burners Do Not Light With Water Flow

    (see chapter 3.9). A gas pressure reading is needed to proceed further. Contact your 4. The GWH 260 PN is designed to modulate gas flow original installer or a licensed gas technician to obtain to the burners when water flow varies. If the water this reading.

  • Page 21: Water Is Not Hot Enough

    Troubleshooting temperature adjustment knob on the water heater chapter 3.9). A gas pressure reading is needed to maybe set too high. Lower the setting and test water proceed further. Contact your original installer or a local temperature. This dial turns counter clockwise for lower certified gas technician to obtain this reading.

  • Page 22: When Operating

    Troubleshooting faucet aerators and whole house filters are clear of debris. Restrictions in the water path can slow water flow through the heat exchanger causing it to boil and make noise. 3. If the water has a high mineral content, the heat exchanger may be scaled internally.

  • Page 23: 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 24: Interior Components And Diagram Parts List

    Interior components and diagram parts list Interior components and diagram parts list Interior components Fig. 27 Functional scheme Heat exchanger Flexible hot outlet Burner Gas control slide Temperature adjustment selector Pilot gas tubing Water valve Piezo Gas connection 6 720 608 126...

  • Page 25: Components Diagram

    Interior components and diagram parts list Components diagram 6720608126-02.1 JF Fig. 28 Components Diagram 6 720 608 126...

  • Page 26: Parts List

    Interior components and diagram parts list Parts list Item Description Reference Front cover 8 705 431 245 0 Shield 8 705 506 817 0 Temp. control knob 8 702 000 295 0 Draft Diverter 8 705 505 438 0 Exhaust pipe union Ø128 8 705 504 150 0 Angle bracket 8 708 003 190 0...

  • Page 27: Fifteen Year Limited Warranty

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

  • Page 28

    * See Chapter 3.8 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 BBT NORTH AMERICA Bosch Group Bosch Water Heating VULCANO Termodomésticos S.A. 340 Mad River Park Estrada de Cacia...

This manual also for:

520-pn-n, 520-pn-l

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