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Bosch Aquastar GWH 1600 H N User Manual

Hydro-generated ignition suitable for heating potable water only not approved for space heating or preheated water applications
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MODEL GWH 1600 H
INDOOR MODEL
Hydro-generated ignition
Suitable for heating potable water only
Not approved for space heating or preheated water applications
GWH 1600 H N - Natural Gas
GWH 1600 H L - 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
appliance.
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.
Upon
completion
instructions should be handed to the user of the
appliance for future reference.
of
the
installation,
these
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
department.
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.

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Table of Contents
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  Summary of Contents for Bosch Aquastar GWH 1600 H N

  • Page 1 Not approved for space heating or preheated water applications GWH 1600 H N - Natural Gas GWH 1600 H L - 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

    Warning Warning: The heater must be isolated Appliance details from the gas supply piping system GWH 1600 H specifications (Technical data) during any pressure testing of that Unpacking the GWH 1600 H heater system at test pressures equal to or General rules to follow for safe operation more than 0.5 psig.
  • Page 3: Appliance Details

    • Width (in): 16.73” (425 mm) Approved in US/Canada • Height (in): 25.79” (655 mm) Capacity • Weight: 35 pounds (16 kg). GWH 1600 H: 4.36 GPM Gas types Maximum output Natural Gas. GWH 1600 H: 91,525 Btu/hr LP Gas...
  • Page 4: Unpacking The Gwh 1600 H Heater

    Please complete and return the enclosed product has been underwater. registration card. BOSCH is constantly improving its The GWH 1600 H is not approved or designed for: products, therefore specifications are • Manufactured (mobile) homes, RV's or boats subject to change without prior notice.
  • Page 5: Dimensions And Installation Clearances

    Observation window 21.25” (540) On/Off switch LED failure indicator 2.55” (65) 1.18” (30) 3/4” Table 1 Dimensions in inches (mm) Model GWH 1600 H TOP (A) 12 inches (306 mm) FRONT (B) 4 inches (100 mm) BACK 0 inches SIDES...
  • Page 6: Installation Instructions

    Please contact Bosch Water Heating with any Heater placement and clearances questions. The GWH 1600 H 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 H 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

    Installation instructions Combustion air requirements Fuel Gas Code for complete information. In buildings of tight construction all air should be taken from outside. The AquaStar water heater holds cold water in its copper heat exchanger and water valve when not in use. Venting Because of this, any cold air that comes down through the unit's vent pipe is capable of freezing these...
  • Page 9 Installation instructions B All gas vent sections must be secured to each other with sheet metal screws and be properly supported. 5” X 6” ADAPTOR USED ON HIGH Horizontal runs: ALTITUDE Any gas vent section that is greater than 45 degrees from the vertical is considered horizontal.
  • Page 10 Installation instructions Masonry chimney LOWEST DISCHARGE Masonry chimneys shall be built and installed in LISTED VENT CAP OPENING accordance with NFPS 211 or local codes. A minimum 5" diameter gas vent pipe (metal double wall Type B), or an approved clay flue liner or a listed chimney lining H (minimum) height from roof to lowest system must be used when venting into a naturally...
  • Page 11: Gas Piping & Connections

    Fig. 13 Installation of Gas Pressure Regulator Note: The gas pressures specified below refer to Note: The GWH 1600 H 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 1600 H (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

    Follow the gas supplier’s instructions. thermostatically controlled operation of the pump is commonly done. The GWH 1600 H should be plumbed B If you cannot reach your gas supplier, call the fire in line before the mini-tank water heater. Contact Bosch department.
  • Page 15: Lighting Instructions

    B 7. The pilot flame will extinguish 10-30 seconds after the burners come on. The burners will remain on until the hot water tap is turned off. Note: The GWH 1600 H operates in two modes. See SETTING THE WATER TEMPERATURE. Note:...
  • Page 16: Setting The Water Temperature

    Operation instructions Setting the water temperature Power adjustment The GWH 1600 H has a gas control that modulates Less power. burner input in response to flow. Its purpose is to Lower water temperature. 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 The GWH 1600 H 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 H, 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

    Troubleshooting Troubleshooting Introduction damaged/defective. Visit www.boschhotwater.com to purchase replacement part, or call Bosch Water Many of the questions customers ask regarding Heating at 800-642-3111 for replacement part if still operation of this unit can be answered by following the under warranty.
  • Page 20: Pilot Light, But Burners Will Not Come On

    Visit www.boschhotwater.com purchase replacement part, or call Bosch Water Heating at • 6. Open a hot water faucet. While sparking, hold a 800-642-3111 for replacement part if still under flame from a lit match or lighter in the pilot area. If the warranty.
  • Page 21: Hot Water Temperature Fluctuates At Tap

    Troubleshooting • 4. Hot water is very hot out of the tap, requiring a lot water temperatures. See chapter 4.5. If the problem of cold water to be added with it in order to attain a persists, go to www.boschhotwater.com for a more useable hot water temperature.
  • Page 22: Water Is Not Hot Enough

    Troubleshooting • 3. Inlet water is preheated. This model does not have • 7. Gas pressure is too low. Ensure gas pressure is in a thermostat and will not modulate flame height in accordance with specifications in the installation order to prevent overheating. It is designed for a cold manual.
  • Page 23: Burners Do Not Burn Cleanly, Yellow Flames When Operating

    Protecting the environment in the water path can slow water flow through the 7 Protecting the environment 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. This restricts the Packing water path, causing the water to boil resulting in The packing box may be fully recycled as confirmed by...
  • Page 24: Interior Components And Diagram Parts List

    Interior components and diagram parts list Interior components and diagram parts list Interior components Fig. 26 Functional scheme Heat exchanger Output control Main gas burner Pilot gas tubing Electronic control box on/off switch Temperature adjustment selector Water valve Flexible hot outlet 6 720 608 032...
  • Page 25: Components Diagram

    Interior components and diagram parts list Components diagram 6720608032-07.1 JF Fig. 27 Components Diagram 6 720 608 032...
  • Page 26: Parts List

    Interior components and diagram parts list Parts list Item Description Reference Front cover 8 705 431 242 0 Shield 8 705 506 814 0 Control cover 8 705 506 813 0 Temp. control knob 8 702 000 305 0 Water flow selector handle 8 702 000 304 0 Draft Diverter 8 705 505 442 0...
  • Page 27: Twelve Year Limited Warranty

    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 * 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...