It is strongly recommended that the natural gas pipe line be 3/4" for the entire distance. If the maximum length is above 40 feet, use 1" line. Flexible tubing is NOT recommended, but if it is to be used, oversize it. With LP gas installation, the recommended sizes are 5/8" up to a maximum of 20 feet distance, 3/4" up to 50 ft distance and 7/8" up to 100 feet.

National Fuel Gas Code requires that a sediment trap (drip leg) be installed on gas appliances. The drip leg must be accessible and not subject to freezing conditions. Install in accordance with the recommendations of the gas supplier.

NOTE: The AquaStar 125FX is supplied with a gas pressure regulator that must be installed on the heater before attaching the gas supply line. See figure 6. Failure to install the gas regulator as shown in figure 6 will be a violation of CSA certification of the unit. The regulator supplied with the heater is preset for the gas shown on the rating plate to the correct pressure. It is an appliance level regulator designed for (low inlet) pressure (less than 1/2 Psig or 15” W.C.) DO NOT connect to an unregulated or high pressure propane line or to a high pressure commercial natural gas line.

GAS INLET PIPE

PRESSURETAP

PLASTIC CAP

APPLIANCE PRESSURE

REGULATOR

(with directional arrow on reverse side pointing upward)

Fig. 6 - Appliance pressure regulator

(with directional arrow on reverse side pointing up)

The pressure regulator provided with the heater is adjusted to deliver the proper gas pressure (as indicated on the rating plate and in the manual for altitude up to 2000 feet (660 meters) above sea level. On appliances being installed above 2000 ft (660 meters) elevation, the inlet gas pressure should be set at installation to the value shown below.

NOTE: The gas pressures specified below refer to pressures taken at the pressure tap on the gas inlet pipe just above the regulator (See Fig 6). These readings should be taken while the heater is operating at full input — i.e. maximum water flow with the temperature dial selector turned all the way clockwise.

MAXIMUM INLET PRESSURE SETTINGS

Altitude

Natural Gas

Liquid Propane

 

inches W.C:

inches W.C:

0' - 2.000 ft

5.38

9.9

2.000 ft - 4.500 ft

4.40

7.90

Above 4.500 ft consult your local gas provider.

WARNING: The heater must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of .5 psig.

The water heater must be isolated from the gas supply piping system by closing the manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or greater than .5 psig.

The water heater, including the pressure regulator provided with it, must not be operated at gas supply pressures in excess of .5 psig. If overpressure has occurred, such as through improper testing of the gas lines or malfunction of the supply system, the gas valve and regulator must be checked for safe operation.

When your connections are made, check for gas leaks at all joints (not just the ones you made). Apply some soapy water to all gas fittings and gas valve. Soap bubbles are a sign of a leak.

NOTE: Do not apply soap solution to pilot filter screen or pilot orifice area. If you have a leak, shut off the gas. After verifying that required gaskets are in place, tighten appropriate fittings to stop leak. Turn the gas on and check again with a soapy solution. Never test for gas leaks using a match or flame.

WATER CONNECTIONS

When facing the heater, the cold water inlet is on your right and the hot water outlet is on your left.

Although water piping throughout your structure may be other than copper, we recommend that copper piping be used for at least three feet before and after the heater (follow local codes if more stringent). Keep water inlet pipe to no less than 1/2 inch diameter to allow the full flow capacity. Remember that water pressure must be sufficient to activate the heater when drawing hot water from the top floor. If the hot and cold connections to the heater are reversed, the heater will not function. The AquaStar 125FX is provided with two flexible type connectors that must be connected to the inlet and outlet fittings of the water valve as shown in Figs 7 and 8. ½” Copper or brass fittings work best when connected to the connectors. See Fig 8. These connectors seal to the water valve by means of a union connection with a washer type gasket at the joint. No pipe dope or thread tape is to be used at these joints. Be certain there are no loose particles or dirt in the piping. Blow out or flush the lines before connecting to the AquaStar. Full port valves should be installed on both the cold water feed line and the hot water outlet line to facilitate servicing the heater.

For installation on a private well system, be sure that the water pressure is set between 30 and 50 psi.

INLET WASHER

WATER FILTER

WATER VALVE

FLEX

CONNECTORS

WASHER

OUTLET

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

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Bosch Appliances 125FX LP Water Connections, Maximum Inlet Pressure Settings, Altitude Natural Gas Liquid Propane
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125FX NG, 125FX LP specifications

Bosch Appliances has been a leader in the home appliance industry for decades, known for their innovation, efficiency, and reliability. Among their notable offerings are the Bosch 125FX LP and 125FX NG, two versatile models designed for modern kitchens that cater to the needs of both home cooks and professional chefs.

One of the standout features of the Bosch 125FX models is their dual-fuel capability. With options for liquid propane (LP) and natural gas (NG), these appliances provide flexibility in fuel choice, maximizing efficiency and performance. Users can select the type of gas that best suits their culinary style and kitchen setup, ensuring optimal cooking results.

Both models boast a powerful burner system that includes multiple high-performance burners. Featuring a high-output burner designed for rapid heating, these appliances allow for quick boiling and searing, making them ideal for time-sensitive cooking. Additionally, a simmer burner is included which provides low heat for delicate sauces and simmering dishes, striking a balance between power and control.

The Bosch 125FX series incorporates advanced cooking technologies that elevate the user experience. One significant technology is the precise temperature control, which ensures that cooking temperatures remain consistent, reducing the risk of overcooking or burning meals. The built-in oven features a convection cooking option, allowing for even heat distribution, resulting in perfectly baked goods and roasted dishes.

Another notable characteristic of these appliances is their sleek and modern design. Bosch has a reputation for creating aesthetically pleasing products that fit seamlessly into contemporary kitchen environments. Premium materials, rounded edges, and clean lines give the 125FX models a sophisticated look that appeals to style-conscious consumers.

User-friendly features are also prominent in both the LP and NG models. Intuitive knobs and controls allow for easy adjustments, while the large oven capacity provides ample space for multiple dishes, perfect for families or entertaining guests. Additionally, Bosch's commitment to energy efficiency means these appliances not only save on energy bills but also decrease the environmental footprint of your home.

In summary, the Bosch 125FX LP and 125FX NG are premier appliance choices for anyone looking to enhance their kitchen. With powerful cooking capabilities, innovative technologies, and a stylish design, they encapsulate Bosch's commitment to quality and performance in home appliances.
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