This heater is provided with a properly certified combination temperature - pressure relief valve by the manufacturer.

The valve is certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements for Relief Valves for Hot Water Supply Systems, ANSI Z21.22 • CSA 4.4, and the code requirements of ASME.

If replaced, the valve must meet the requirements of local codes, but not less than a combination temperature and pressure relief valve certified as indicated in the above paragraph.

The valve must be marked with a maximum set pressure not to exceed the marked hydrostatic working pressure of the water heater (150 psi = 1,035 kPa) and a discharge capacity not less than the water heater input rate as shown on the model rating plate.

For safe operation of the water heater, the relief valve must not be removed from its designated opening nor plugged.

The temperature-pressure relief valve must be installed directly into the fitting of the water heater designed for the relief valve. Provide tubing so that any discharge will exit only within 6 inches (153 mm) above an adequate drain, or external to the building or structure. Be certain that no contact is made with any live electrical part. The discharge opening must not be blocked or reduced in size under any circumstances. Excessive length, over 30 feet (9.14 m), or use of more than four elbows can cause restriction and reduce the discharge capacity of the valve.

No valve or other obstruction is to be placed between the relief valve and the tank. Do not connect tubing directly to discharge drain unless a 6 inch air gap is provided. The relief valve must be allowed to discharge water in sufficient quantities, should circumstances demand, to prevent bodily injury, hazard to life, or property damage. If the discharge pipe is not connected to a drain or other suitable means, the water flow may cause property damage.

The Discharge Pipe:

•Shall not be smaller in size than the outlet pipe size of the valve, or have any reducing couplings or other restrictions.

•Shall not be plugged or blocked.

•Shall be of material listed for hot water distribution.

•Shall be installed so as to allow complete drainage of both the temperature-pressure relief valve, and the discharge pipe.

•Shall terminate at an adequate drain or external to the building or structure.

•Shall not have any shut-off valve between the relief valve and tank nor in the discharge pipe.

The temperature-pressure relief valve must be manually operated at least once a year. Caution should be taken to ensure that (1) no one is in front of or around the outlet of the temperature-pressure relief valve discharge line, and (2) the water manually discharged will not cause any bodily injury or property damage because the water may be extremely hot.

If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater, follow the draining instructions, and replace the temperature-pressure relief valve with a new one.

Filling the Water Heater

Never use this water heater unless it is completely full of water. To prevent damage to the tank and heating element, the tank must be filled with water. Water must flow from the hot water faucet before turning “ON” electrical supply to the water heater. The manufacturer will not warrant any elements damaged by failure to follow instructions.

To fill the water heater with water:

1.Open the cold water supply valve to the water heater.

NOTE: The cold water supply valve must be left open when the water heater is in use.

2.To ensure complete filling of the tank, allow air to exit by opening the nearest hot water faucet. Allow water to run until a constant flow is obtained. This will let air out of the water heater and the piping.

3.Check all water piping and connections for leaks. Repair as needed.

4.Never alter or modify the certified construction of the water heater or its components, or bypass any safety features. Doing so voids all warranties.

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A.O. Smith AOSRE50400 warranty Filling the Water Heater
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AOSRE50400 specifications

A.O. Smith AOSRE50400 is a high-efficiency water heater that exemplifies advanced technology and engineering, making it a popular choice for residential and commercial applications. This model is part of A.O. Smith’s comprehensive line of water heating solutions and is designed to provide reliable performance while maximizing energy efficiency.

One of the standout features of the AOSRE50400 is its high energy factor (EF), which greatly contributes to reduced energy bills and a smaller environmental footprint. With an EF rating of approximately 0.95, this water heater utilizes innovative design techniques to ensure that more of the energy consumed is converted into usable hot water. It meets and often exceeds the stringent energy efficiency standards set by the Department of Energy.

The AOSRE50400 is equipped with advanced insulating materials, which minimize heat loss and improve overall efficiency. This is particularly beneficial in maintaining water temperature for extended periods, reducing the need for excessive reheating. The tank has been designed with a glass-lined interior that offers enhanced durability and resistance to corrosion, extending the lifespan of the unit.

Another important characteristic of the AOSRE50400 is its large capacity. With a tank size of 50 gallons, it can effectively meet the hot water demands of medium to large households or businesses. This capacity allows for simultaneous usage across multiple outlets, ensuring that you never run out of hot water when you need it most.

The digital display and user-friendly interface provide homeowners with easy control over temperature settings and operation modes. This feature enhances user convenience and allows for customized hot water delivery that can cater to specific usage needs. Furthermore, the built-in diagnostic system alerts users to any potential issues, ensuring timely maintenance and reducing the risk of costly repairs.

A.O. Smith also prioritizes safety in the design of the AOSRE50400. It comes with multiple safety features, including a temperature and pressure relief valve, which helps prevent potential overpressure situations. This commitment to safety ensures peace of mind for users and compliance with local plumbing codes.

In summary, the A.O. Smith AOSRE50400 water heater exemplifies modern engineering and technology, offering high energy efficiency, a durable design, user-friendly controls, and a strong commitment to safety. Its large capacity and advanced features make it an exceptional choice for those seeking reliable and efficient hot water solutions.
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