Water Connections

Install the heater centrally in the building if possible and make hot water piping runs as short as possible When facing the heater, the cold water inlet will be on the right and the hot water outlet on the left..

Although water piping throughout the building may be other than copper, copper or galvanized piping should be used when connecting to the heaters ½” male NPT flex connectors (follow local codes if more stringent). Plastics or other PEX type plumbing line materials are not suitable for connecting directly to the water heater. Keep water inlet pipe to no less than ½” (19.05mm) diameter to allow the full flow capacity. If the cold and hot connections to the heater are reversed, the heater will not function.

The 125FX is provided with one flexible type connector that must be connected to the cold inlet fitting of the water valve as shown in Fig. 7. The union end of the flexible connector should be attached to the rear inlet port of the water valve with the supplied washer gasket. No pipe dope or thread tape is to be used at this joint. The ½” flexible hot water outlet line is supplied attached to the heater.

Be certain there are no loose particles or dirt in the piping. Blow out or flush the lines before connecting to the water heater. Full port valves should be installed on both the cold water supply and hot water outlet lines to facilitate servicing the heater (see Fig. 7). 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).

Fig.7 - Water valve and water connectors, top view

Connecting the pressure relief valve (PRV)

The listed pressure relief valve supplied with the heater must be installed at the time of installation. Should a discharge line be added to the PRV no valve is to be placed between the PRV and the heater. No reducing coupling or other restriction may be installed in the discharge line. The discharge line must be installed such that it allows complete drainage of both the PRV and the line. The location of the PRV must be readily accessible for servicing or replacement and be mounted as close to the water heater as possible. To install the PRV, a suitable fitting connected to an extension on a “T” fitting can be sweated to the hot water line. See Fig 8.

PIPE PRV TO

APPROPRIATE

DISCHARGE

Fig. 8 - Plumbing and Pressure Relief Valve

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125FX NG, 125FX LP specifications

The AquaStar 125FX NG and 125FX LP are two remarkable models in the world of high-efficiency heaters. Designed for optimal performance in residential settings, these devices cater to diverse needs with their advanced technology and user-friendly features.

The AquaStar 125FX NG model operates using natural gas, while the 125FX LP utilizes liquid propane. This versatility allows users to choose the most suitable fuel type for their home setup. Both models boast an impressive energy efficiency rating, ensuring minimal energy waste while delivering reliable hot water on demand. This makes them not only cost-effective but also an eco-friendly choice for homeowners looking to reduce their carbon footprint.

One of the standout features of the AquaStar 125FX series is its compact design, which makes it ideal for installations in small spaces. With a sleek and modern appearance, it can easily blend into various interior aesthetics without occupying excessive room. The units are also relatively lightweight, facilitating a simple installation process.

In terms of performance, both the NG and LP models are equipped with a powerful BTU input that guarantees quick heating capabilities. They can provide ample hot water for multiple applications simultaneously, such as showers and dishwashing, making them perfect for busy households. Furthermore, the AquaStar 125FX units utilize advanced burner technology that ensures efficient combustion, resulting in a constant supply of hot water without fluctuations in temperature.

Safety is paramount in the design of the AquaStar 125FX series. Each heater is equipped with comprehensive safety features, including built-in vents for proper exhaust and a flame failure device that shuts the heater off if the flame goes out unexpectedly.

The control panel on both models is intuitive, allowing users to easily adjust the water temperature and monitor the unit's performance. Additionally, the AquaStar 125FX series is designed for longevity, with corrosion-resistant materials that withstand the rigors of daily use.

In summary, the AquaStar 125FX NG and 125FX LP are perfect examples of modern, efficient water heating technology. With their compact design, rapid heating capabilities, and robust safety features, these models present an excellent choice for any home looking to enhance its hot water supply while maintaining efficiency and environmental responsibility.