AquaStar GWH 1600 P manual Water is too hot, Water is not hot enough, Low hot water pressure

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Troubleshooting

6.7Water is too hot

1.Verify gas type indicated in rating sticker located on right-hand side of cover, coincides with the gas type you are using. NG is a natural gas unit and LP is for liquid propane.

2.Adjust the gas control slide button from three flame position towards the one flame position for cooler temperatures. If the water is still too hot, the temperature adjustment knob on the water heater maybe set too high. Lower the setting and test water temperature. This dial turns counter clockwise for lower temperatures and clockwise for higher temperatures.

3.Inlet water is preheated. This model does not have a thermostat and thus will not modulate flame height in order to prevent over heating. It is designed for a cold water feed only. Replumb the heater with cold water to the inlet.

4.Increase the flow rate. Restrictions in the water path can slow the flow of water through the heater, resulting in very hot outlet temperatures. Restrictive showerheads and faucet aerators should be cleaned out or upgraded with less restrictive ones. In addition, the water heater's inlet filter should be cleaned and inspected (see chapter 5.2).

5.If water is still too hot, consult service bulletins on www.boschhotwater.com to lower outlet temperatures further.

6.If the water has a high mineral content, the heat exchanger may be scaled internally. This restricts the water path, causing the water to boil and produce extremely hot temperatures. Instructions for descaling

the heat exchanger are available at www.boschhotwater.com.

6.8Water is not hot enough

1.Verify gas type indicated in rating sticker located on right-hand side of cover, coincides with the gas type you are using. NG is a natural gas unit and LP is for liquid propane.

2.Flow at one particular tap is too great or too many fixtures are running at one time. Lower flow to stay within heater's specifications.

3.Ensure the gas control slide button is all the way to the 3 flame position. In addition, the temperature adjustment knob on water heater maybe set too low. Turn the knob clockwise for higher temperatures and test the water temperature.

4.Shut off installer supplied cold water shut off valve (if none installed, install before proceeding). Open all hot water taps supplied by the heater. Wait 5 minutes and check all taps. Any water running is a sign of a plumbing crossover. Consult a local plumber or service person for help in correcting a plumbing crossover.

5.Inspect the water path outside of the heater for obstructions. Make sure all outlets (i.e. showerheads,

faucet aerators and whole house filters) are clear of debris. Also, the water heater's inlet filter screen should be inspected and cleaned (see chapter 5.2).

6.The water valve may be dirty, prohibiting it from fully opening the gas valve. This part needs to be periodically serviced (every 2-5 yrs depending on water quality and use) (see chapter 5.2).

7.Gas pressure is too low. Ensure gas pressure is in accordance with manufacturer's specifications (see chapter 3.9). A gas pressure reading is needed to proceed further. Contact your original installer or a local certified gas technician to obtain this reading.

6.9Burners ignite without hot water flow

1.The water valve may be dirty and sticking, prohibiting it from fully closing the gas valve. This part needs to be periodically serviced (every 2-5 yrs depending on water quality and use) (see chapter 5.2).

6.10 Low hot water pressure

1.Confirm adequate flow rate through the unit. With cold supply shut off to the unit, disconnect hot outlet side to the unit. Place a half gallon jug under hot outlet to catch water. Open cold supply and measure flow rate out of the unit. With temperature adjustment knob set all 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).

2.Confirm the incoming water pressure to the unit is above the required 30psi.

3.Inspect the water path outside of the heater for obstructions. Make sure all outlets (i.e. showerheads, faucet aerators and whole house filters) are clear of debris.

4.Be sure to run only one major application at a time with this unit. Opening too many taps at one time can disperse water flow resulting in a diminished flow/ pressure at all outlets.

5.If the water has a high mineral content, the heat exchanger may be scaled internally. This restricts the water path, causing diminished water flow. Instructions for descaling the heat exchanger are available at www.boschhotwater.com.

6.11 Noise when heater is running

1.Confirm adequate flow rate through the unit. With cold supply shut off to the unit, disconnect hot outlet side to the unit. Place a half gallon jug under hot outlet to catch water. Open cold supply and measure flow rate out of the unit. With temperature adjustment knob set all

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Contents Model GWH 1600 P Index IndexAppliance details GWH 1600 P specifications Technical dataAppliance details Water resistantGeneral rules to follow for safe operation Unpacking the GWH 1600 P heaterDimensions in Inches and mm Dimensions and installation clearancesProper location for installing your heater Installation instructionsHeater placement and clearances Installation instructionsRemove cover and inspect Remove the temperature control Mounting HeaterHang heater on two L shaped hooks. See Fig Appliances located in confined spaces Combustion air requirementsVenting Existing interior masonry chimney Installation instructions Masonry chimneyGAS Connections Gas piping & connectionsFor Natural GAS Connecting the pressure relief valve PRV Connecting manometer Shut off gasMeasuring gas pressure Water connectionsOperation instructions For your safety read before operating your water heaterRecirculation application Operation instructionsSetting the water temperature Lighting instructionsTo turn off appliance Draining water from heater Temperature adjustment knobMaintenance intervals Maintenance and serviceWater valve PilotMain burners Vent assemblyMineral scale build-up Operate the circulating pumpPilot lights, but goes out when button released TroubleshootingIntroduction Pilot does not light Pilot goes out during or after hot water useHot water temperature fluctuates at tap Burners do not light with water flowCheck for a clogged inlet water filter screen see chapter Water is too hot Noise when heater is runningWater is not hot enough Burners ignite without hot water flowBurners do not operate cleanly yellow flames when operating Protecting the environment Protecting the environmentSaving water resources Interior components and diagram parts list Interior components and diagram parts listInterior components Components Diagram Components diagramDescription Reference Parts listTwelve Year Limited Warranty Serial Number Gas Pressure Reading StaticWaitsfield, VT all rights reserved

GWH 1600 P specifications

The AquaStar GWH 1600 P is a state-of-the-art gas water heater designed to efficiently meet the hot water needs of residential users. Renowned for its innovative features and user-friendly technology, the AquaStar GWH 1600 P stands out in the competitive market of heating solutions.

One of the main features of this model is its impressive heating capacity. With a power output of 16 liters per minute, it ensures an abundant supply of hot water for multiple applications simultaneously. This makes it ideal for households with high-demand hot water needs, such as families or homes with multiple bathrooms.

The GWH 1600 P employs advanced combustion technology that optimizes fuel efficiency. It utilizes a microprocessor-controlled system that adjusts the gas flow based on the water demand, ensuring a consistent and efficient heating performance. This not only translates into energy savings but also contributes to reduced carbon emissions, making it an environmentally friendly option.

Another notable characteristic of the AquaStar GWH 1600 P is its safety features. The unit is equipped with a range of safety mechanisms, including an automatic shut-off system that activates in the event of a gas leak or excessive temperatures. This provides peace of mind for users, ensuring that safety is prioritized without compromising performance.

Moreover, the GWH 1600 P is designed for ease of installation and maintenance. It features a compact design, allowing for versatile placement options within a home. The intuitive digital display provides clear information on the operation, enabling users to monitor and adjust settings effortlessly.

The durability of the AquaStar GWH 1600 P is another characteristic worth mentioning. Constructed with high-quality materials, the unit is built to withstand the rigors of daily use, ensuring longevity and reliability.

In conclusion, the AquaStar GWH 1600 P gas water heater combines efficiency, safety, and durability into a single, powerful solution for hot water needs. With its robust performance and advanced technologies, it remains a top choice for homeowners seeking a dependable and economical heating solution for their hot water requirements. Whether for daily use or for special occasions, the AquaStar GWH 1600 P is equipped to deliver unmatched performance and satisfaction.
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