AquaStar 125HX LP, 125HX NG specifications HOT Water Temperature Fluctuates / Unit Deactivated

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HOT WATER TEMPERATURE FLUCTUATES / UNIT DEACTIVATED

1. Unbalanced pressure in waterlines

The added restriction caused by the 125 HX in the hot water system can result in uneven pressures between the cold and the hot. In such cases when mixing cold water at the tap, the lower hot water pressure may be overpowered by a much higher cold water pressure, which may cause the 125 HX burners to shut down. Make sure faucet aerators or shower heads are free of minerals. Do not add any flow restrictor to the shower head.

2. Temperature balance valves

If the inlet water temperature to the water heater is very warm the heater can produce temperatures that may be found to be too hot. A temperature balance shower valve can automatically mix in cold water to reduce such hot water temperature, in the event of any temperature instability with the use of a temperature balance shower valve, refer to shower valve manufactures instructions for internal adjustment setting. Adjustments should be made to the hottest setting in the shower valve. Additionally the temperature control of the heater can be adjusted to produce a more comfortable hot water temperature. See SETTING THE WATER TEMPERATURE section.

3.Cold water is mixing with the hot water between the 125 HX and the outlet

See #2 under “NO SPARK AT THE PILOT”.

4.Inlet water pressure is erratic due to inadequate supply water pressure or saturated pressure tank on well system

Check the inlet water pressure. For installation on a private well system with the use of a pressure tank, the lowest pressure range setting recommended is 30-50 psi (2.07 - 3.45 bar). Confirm that the pressure tank is not water logged.

5. Gas pressure is too low

See page 3 for correct specifications.

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Contents Table of Contents For Your SafetyWhat to do if YOU Smell GAS 720 606 Features Unpacking the 125 HX HeaterPrinciple of Operation Required Natural Gas Pressure at inletModel 125HX Proper Location for Installing Your Heater General Rules to Follow For Safe OperationCombustion AIR Requirements Mounting InstallationClearances Plasterboard, can cause failure of mounting VentingVent pipe connection Existing Interior Masonry Chimney Masonry ChimneysTile Lined Interior Masonry Chimney GAS Line Sizing GAS Connections6 Adaptor Used on High Altitude For LP GAS For Natural GASSource National Fuel Gas Code Nfpa 54, Ansi Z223.1 Water Connections Operating InstructionsLighting and Operating Instructions Setting the Water TemperatureTo Turn OFF GAS to Appliance Maintenance and Service Trouble ShootingReview Maintenance Table on the Back of this Manual Not enlarge the orificeNo Spark AT the Pilot Ground water temperature is very warm Pilot Lights but Burners will not Come onMain Burners GO OUT During HOT Water USE Water is TOO HOTHOT Water Temperature Fluctuates / Unit Deactivated Diagram of 125 HX Interior Components Diagram and Parts List Interior Components Diagram Parts List 125 HX Flow chart of 125 HX Twelve Year Limited Warranty General720 606 720 606 Maintenance Table see BBT North America

125HX LP, 125HX NG specifications

The AquaStar 125HX NG and 125HX LP are highly efficient gas tankless water heaters designed to meet the demands of modern households. With their compact size and advanced technology, these units provide an endless supply of hot water while maintaining energy efficiency. Both models cater to natural gas and propane applications, making them versatile options for various installations.

One of the standout features of the AquaStar 125HX series is its ability to deliver a powerful output of up to 199,000 BTUs, ensuring that multiple hot water outlets can operate simultaneously without a drop in temperature. Users can enjoy the convenience of hot showers, laundry, and dishwashing all at once, making it an ideal choice for busy families or households with high hot water needs.

These models incorporate a sophisticated modulating gas valve that adjusts the gas flow based on the demand for hot water. This technology not only optimizes energy consumption but also contributes to extended unit life by minimizing wear and tear on the components. The AquaStar 125HX units also come equipped with a patented electronic ignition system, which eliminates the need for a standing pilot light and reduces gas consumption.

Furthermore, the AquaStar 125HX NG and 125HX LP feature a durable heat exchanger constructed from high-grade copper, which enhances thermal efficiency and prevents corrosion. This ensures a longer lifespan and increased reliability for homeowners. Additionally, the units are compact and wall-mounted, allowing for flexible installation in various spaces, including tight utility closets or outside walls.

Safety is also a top priority, with built-in overheat protection and a freeze protection feature that ensures the unit remains operational even in colder climates. The AquaStar 125HX series operates quietly, allowing users to enjoy the benefits of hot water without the disruptive noise commonly associated with traditional water heaters.

In summary, the AquaStar 125HX NG and 125HX LP are leading choices in the tankless water heater market, combining efficiency, reliability, and innovation. Their impressive output, advanced technologies, and compact design make them suitable for modern living, ensuring homeowners have access to hot water whenever they need it. With these features, AquaStar continues to set a high standard in water heating solutions.
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