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Bosch GWH 1600 PS Owner's Manual

Bosch owner's manual natural gas water heater gwh 1600 ps
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Standing pilot, thermostatically modulated
Suitable for heating potable water only
Not approved for space heating
For use with solar preheated water
M O D E L G W H 1 6 0 0 P S



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  Summary of Contents for Bosch GWH 1600 PS

  • Page 1 MODEL GWH 1600 PS INDOOR MODEL Standing pilot, thermostatically modulated Suitable for heating potable water only Not approved for space heating For use with solar preheated water M O D E L G W H 1 6 0 0 P S •...
  • Page 2: Table Of Contents

    Index Index Warning Appliance details GWH 1600 PS specifications (Technical data) Unpacking the GWH 1600 PS heater General rules to follow for safe operation Dimensions Installation instructions Introduction Proper location for installing your heater Heater placement and clearances Mounting Heater...
  • Page 3: Appliance Details

    Appliance details GWH 1600 PS specifications (Technical data) Approved in US/Canada Capacity GWH 1600 PS: 4.3 GPM Maximum output GWH 1600 PS: 96,600 Btu/hr Maximum input GWH 1600 PS: 117,000 Btu/hr Efficiency in % Recovery efficiency 80% Min. Output GWH 1600 PS: 23,400 Btu/hr Gas Requirement Gas connection (inches) - ½”...
  • Page 4 • Incandescent particle tray. Please complete and return the enclosed product registration card. The GWH 1600 PS is not approved or designed for: • Manufactured (mobile) homes, RV's, boats or any mobile installation • Heating or other recirculating/pumping applications* •...
  • Page 5 Holes for hanging on wall Exhaust pipe union Draft diverter Gas valve Observation window Piezo Igniter button Off button Pilot button On button 6 720 606 518 Appliance details ½ ” Table 1 Dimensions in inches (mm) inches (mm) GWH 1600 PS Dimensions...
  • Page 6: Installation Instructions

    Heater placement and clearances The GWH 1600 PS is design certified for installation on a combustible wall (see 3.4 Mounting installation) provided the floor covering below the heater is noncombustible. For installations in an alcove or closet, maintain the minimum clearances to combustible and non-combustible materials listed below.
  • Page 7 Mounting Heater Warning: before starting installation: B check that there are no loose parts inside the appliance B ensure that gas pipe, gas valve, and burner have no damage and are properly fitted. B Read chapter 2.2 to verify proper gas type and to check all parts are included in box.
  • Page 8 Installation instructions Combustion air requirements The AquaStar 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: Venting

    Fig. 10. Under no circumstances should the vent pipe be reduced in size. B An approved gas vent connector must be attached to the top of the water heater and rise vertically at least 12" before entering into an approved gas vent connector elbow.
  • Page 10 Installation instructions Masonry chimney Masonry chimneys shall be built and installed in 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 system must be used when venting into a naturally drafting, internal masonry chimney.
  • Page 11: Gas Piping & Connections

    Fig. 13 Installation of Gas Pressure Regulator Note: The GWH 1600 PS comes with a gas pressure regulator. Not installing or altering the gas pressure regulator will be a violation of CSA certification of the unit.
  • Page 12 Follow boxed numbers for piping just one GWH 1600 PS (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

    B Record static gas pressure reading on back page of manual. Operating pressure test B Turn on all hot water taps served by the water heater. B Operate all other gas appliances on same gas piping system at maximum output.
  • Page 14: Recirculation Application

    A timed or thermostatically controlled operation of the pump is commonly done. The GWH 1600 PS should be plumbed in line before the mini-tank water heater. Contact Bosch Water Heating if further instruction is needed.
  • Page 15: Lighting Instructions

    Lighting instructions B STOP! Read the previous safety information. B The gas valve must be turned off by pushing the gas valve off ( ) button. Fig. 18 B Wait five (5) minutes to clear out any gas. If you smell gas, STOP! Follow “B”...
  • Page 16: Calibrating The Thermostat

    Operation instructions Calibrating the thermostat B If water temperature is too high or low, calibrate thermostat. B Remove front cover. Caution: it should not be necessary to loosen 22 mm nut beyond two turns out, this is a gas seal and will leak if loosened too far.
  • Page 17: Maintenance And Service

    The warranty does not cover failures improper maintenance. The GWH 1600 PS requires periodic maintenance. The below time maintenance intervals should keep the unit operating for many years. Every year B Inspect inlet water filter screen ( 5.2) B Inspect pilot assembly and flame ( 5.3)
  • Page 18: Pilot

    Check for vent assembly blockage or combustion air blockage on the underside of the unit. Mineral scale build-up The GWH 1600 PS, 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 Open cold water supply isolation valve and flush heat exchanger with clean water. 14. Shut cold water isolation valve and reconnect hot water supply to the water heater. 15. Open water isolation valves, and return the unit to service. Fig. 25...
  • Page 20: Troubleshooting

    3. If using a power vent, check the safety spillage switch reset button (the safety spillage switch is wired through the water heater's thermocouple circuit). The spill switch should be mounted at the top of water heater on the draft diverter (Consult power vent manual for location).
  • Page 21: Burners Do Not Light With Water Flow

    Recalibrate thermostat for cooler outlet temperatures. (See chapter 4.4). 4. The GWH 1600 PS is designed to modulate gas flow to the burners when water flow varies. If the water pressure in the home is erratic and the water flow is not consistent while a tap is opened, then the temperature of hot water will fluctuate.
  • Page 22: Water Is Not Hot Enough

    Place a gallon jug under a hot outlet to catch water. Open cold supply to the water heater and measure flow rate out of the unit. The flow rate should be close to 3.7gpm, filling the jug in less than16...
  • Page 23: Protecting The Environment

    (see chapter 3.6). 6. The water heater has burners much like a furnace. It is essential that they remain clean and are supplied with adequate air for combustion. If the flames burn yellow or orange, it is strongly recommended that the burners be removed from the unit and cleaned.
  • 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 Burner manifold gas pressure test nipple Water valve Main gas burner Gas valve 6 720 606 518...
  • Page 25: Components Diagram

    Interior components and diagram parts list Components diagram Fig. 27 Components Diagram 6 720 606 518...
  • Page 26: Parts List

    Interior components and diagram parts list Parts list Item Description Cover Cap cover Water connection gasket Heat exchanger Hot water pipe Cold water pipe Heat exchanger washer Overheat sensor (ECO) Main burner assembly Main burner assembly Pilot burner assembly Pilot filter screen Piezo electrode Pilot orifice Pilot orifice...
  • Page 27: Twelve Year Limited Warranty

    BBTNA shall not be liable for any loss or damage directly or indirectly arising from the use of the hot water heater, or for any consequential damages arising from such use (including damages from water leakage). BBTNA sole liability with respect to any defect shall be for the replacement of the defective part(s).
  • Page 28 Installer Checklist, to be performed by installer upon installation Serial Number Gas Pressure Reading* Building Water Pressure Average Winter Temperature Average Summer Temperature Installing Company Installer name Address Phone * 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...