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Bosch GWH 1600 P Installation And Operating Instructions Manual

Indoor model
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Standing pilot
Suitable for heating potable water only
Not approved for space heating or preheated water applications
MODEL GWH 1600 P NG - Natural Gas
MODEL GWH 1600 P 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
Improper installation, adjustment, alteration, 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 supplier.
In the Commonwealth of Massachusettes the
installation must be performed by a licensed
plumber or gas fitter.
instructions should be handed to the user of the
appliance for future reference.
What to do if you smell gas
• Open windows
• Close gas valve.
• 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 1600 P

  • Page 1 Not approved for space heating or preheated water applications MODEL GWH 1600 P NG - Natural Gas MODEL GWH 1600 P LP - 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

    Index Index Warning Warning Appliance details GWH 1600 P specifications (Technical data) Warning: The heater must be isolated Unpacking the GWH 1600 P 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: 35 pounds (16 kg). GWH 1600 P: 4.3 GPM Gas types Maximum output Natural Gas. GWH 1600 P: 91 525 Btu/hr LP Gas Maximum input Safety devices GWH 1600 P: 117 000 Btu/hr • Flame failure device (ionization thermocouple) Efficiency in % •...
  • Page 4 The GWH 1600 P is not approved or designed for: • Manufactured (mobile) homes, RV's or boats BOSCH is constantly improving its products, therefore specifications are •...
  • Page 5: Dimensions And Installation Clearances

    Dimensions in Inches and (mm) Heat exchanger Burner Dimensions Temperature control inches (mm) Water valve Gas connection GWH 1600 P Output control Front cover 16.73” (425) Hole for fixing to wall 25.75” (655) Exhaust pipe to connector Draft diverter with flue gas monitor 13.15”...
  • Page 6: Heater Placement And Clearances

    Please contact Bosch Water Heating with any Heater placement and clearances questions. The GWH 1600 P is design certified for installation on Proper location for installing your a combustible wall (see 3.4 Mounting installation) heater provided the floor covering below the heater is noncombustible.
  • Page 7: Mounting Heater

    Screws Incandescent particle tray Fig. 5 Incandescent particle tray illustration Mounting heater. The GWH 1600 P 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: Combustion Air Requirements

    A wood stove or furnace can rob the makeup air in the AquaStar's vent pipe, leaving the cold infiltrating air capable of freezing the cold water in the AquaStar heat exchanger.
  • Page 9 Installation instructions Venting B All gas vent sections must be secured to each other with sheet metal screws and be properly supported. Danger: Do not reduce the vent pipe Horizontal runs: size. Do not put an elbow directly on top Any gas vent section that is greater than 45 degrees of heater.
  • Page 10 Installation instructions Masonry chimney Masonry chimneys shall be built and installed in accordance with NFPS 211 or local codes. A minimum LOWEST DISCHARGE LISTED VENT CAP OPENING 5" diameter gas vent pipe (metal double wall Type B), or an approved clay flue liner or a listed chimney lining system must be used when venting into a naturally H (minimum) height from roof to lowest...
  • Page 11 Fig. 13 Installation of Gas Pressure Regulator Note: The gas pressures specified below refer to Note: The GWH 1600 P comes with a gas pressure pressures taken at the pressure tap on the gas inlet pipe regulator. Not installing or altering the gas pressure just above the regulator.
  • Page 12 Follow boxed numbers for piping just one GWH 1600 P (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 Although water piping throughout your structure may be other than copper, we recommend that copper piping Connecting manometer or suitably rated stainless steel flex line piping be used for at least three feet before and after the heater (follow 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 1600 P 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

    Fig. 19 is burning. If not, repeat lighting steps. B Fully depress gas valve button. Note: The GWH 1600 P operates in two modes. See SETTING THE WATER TEMPERATURE. To turn off appliance B Slide the gas valve button all the way to the left and turn off the installer supplied manual gas shutoff on the supply line to the heater.
  • Page 16: Draining Water From Heater

    Operation instructions ensure that the hot water temperature will remain steady, although the water flow demand might vary. The output temperature can be adjusted with either the temperature adjustment knob or the gas control slide. Temperature adjustment knob The temperature adjustment knob on the front bottom of the heater (see Fig.
  • Page 17: Maintenance And Service

    Separate the two halves of the water valve by removing the five screws on the left side The GWH 1600 P requires periodic maintenance. The of the water valve. Apply lithium or faucet & valve grease below time maintenance intervals should keep the unit to the pushrod and o-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 1600 P, 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

    The GWH 1600 P does not have a button while hitting the pilot igniter button every few thermostat. If inlet water is preheated, the unit will seconds.
  • Page 20: Burners Do Not Light With Water Flow

    Contact your original installer or a licensed gas technician to obtain 4. The GWH 1600 P is designed to modulate gas flow this reading. to the burners when water flow varies. If the water...
  • Page 21: Water Is Too Hot

    Troubleshooting Water is too hot faucet aerators and whole house filters) are clear of debris. Also, the water heater's inlet filter screen should 1. Verify gas type indicated in rating sticker located on be inspected and cleaned (see chapter 5.2). right-hand side of cover, coincides with the gas type 6.
  • Page 22: Flames When Operating

    Troubleshooting the way clockwise, the flow rate should be close to 2gpm, filling the jug in 15 seconds. With the temperature adjustment knob set all the way counterclockwise, the flow rate should be close to 4gpm, filling the jug in 7 seconds. If the flow rate is not adequate, inspect and clean the inlet filter screen (see chapter 5.2).
  • 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. 28 Functional scheme Heat exchanger Flexible hot outlet Burner Gas control slide Temperature adjustment selector Pilot gas tubing Water valve Piezo Gas connection 6 720 608 030...
  • Page 25: Components Diagram

    Interior components and diagram parts list Components diagram 6720608124-10.1 JF Fig. 29 Components Diagram 6 720 608 030...
  • Page 26: Parts List

    Interior components and diagram parts list Parts list Item Description Reference Front cover 8 705 431 244 0 Shield 8 705 506 759 0 Temp. control knob 8 702 000 304 0 Draft Diverter 8 705 505 442 0 Exhaust pipe union Ø128 8 705 504 046 0 Angle bracket 8 708 003 192 0...
  • Page 27: Twelve Year Limited Warranty

    General costs associated with service, removal or re-installation of the original water heater or a replaced water heater. Aquastar water heaters are warranted by the Manufacturer (BOSCH) through BBT North America. Note: the water heater must be free of BBT North America (BBTNA) will furnish a replacement...
  • Page 28 Installer Checklist, to be performed by installer upon installation Serial Number ___ ___ ___ ___ ___ ___ ___ ___ (8 digit serial number is located on rating plate on right side panel) Gas Pressure Reading* Static__________ Operating__________ Building Water Pressure __________ Range if on Well system __________ Average Winter Temperature __________...

This manual is also suitable for:

Aquastar gwh 1600 p ngAquastar gwh 1600 p lp