Typically, these small water heaters are supported between two lengths of sheet metal angle brackets, one placed above the heater and one below the heater. The brackets should be secured to the wall studs with wood screws and the heater secured between them with sheet metal screws. Begin connecting the plumbing to the water heater by connecting the cold water feed to the cold water inlet on the heater, then connect the hot water outlet to the hot water side -- usually the left side -- of the faucets.
To prevent damage to the cabinets, floors and walls, the pressure relief valve should be connected to a suitable drain.
Either a properly installed floor drain or the sink drain will work. These small water heaters may be either plugged into an outlet or hardwired to the branch circuit wires. In both cases, they must be connected to a branch circuit with no other loads on it. The National Electric Code and the local building codes require that a separate ampere branch circuit should be run from the service panel for the hot water heater. If the heater that you purchased came with a cord set attached, you may terminate the branch circuit in a single receptacle for the water heater's plug.
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If you are hard-wiring the water heater to the branch circuit conductor, you will need to run three AWG 12 conductors -- one black, one white and one green -- through a short length of flexible conduit that connects to the heater and to the circuit device box with flex connectors. When you cut the individual conductors, make sure they will be long enough to reach the terminal on the water heater's thermostat.
The long and the short of this story is that a water heater needs two hot conductors and a ground to work. I have not mentioned volt electric water heaters up to this point. For a residence they are highly impractical. They cost a lot to run and will not produce enough hot water to satisfy the needs of a home. The first thing you want to do is make sure that you are getting power to your electric water heater.
See if the breaker has been tripped in the panel.
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Yes, this is sort of good news. Reset the breaker and see if it holds.
Wiring an Electric Hot Water Heater
This could be a sign of another problem. The next logical step would be to see if you have power to the water heater. The wiring is located on the top of the water heater. Before you take the cover off, shut the power off.
How to Install a Volt, 20 Gallon Electric Water Heater | Home Guides | SF Gate
Make sure that the power is off with the non contact voltage tester. Separate the wires enough to test the individual conductors.
Turn the power back on and use a non-contact tester to see if you are getting power to the water heater. The indicator light should light up when you are near a hot conductor. You should have two hot conductors coming into your electric water heater. There are two covers on the side of your electric hot water tank. Wiring and electric hot water heater also includes the high limit reset buttons. When they trip the water will not heat up. The first thing you do is to shut off the power.
After that there are two covers on the side of the hot water tank. Remove the covers, the insulation and the plastic shields. Make sure the power is off by using a working voltage tester.
The upper and possibly the lower thermostats will have a red reset button. They pop out when they trip. After you reset them you can put the covers on and turn on the power. If they keep tripping, something else is wrong, either with the thermostats or the elements. You can use a simple test to tell if the elements are bad. Sediment build up can cause the lower element to fail repeatedly. See Hot Water Heater Sediment for information on build up in your water tank. Wiring an electric water heater also includes the thermostats.
The thermostats tell the elements when to heat up. Most residential water heaters have an upper and a lower thermostat. These are usually set up for non-simultaneous operation. Meaning that only one element is allowed to heat at a time. The upper thermostat acts as the controller, allowing first the upper element to heat and then the lower element. A bad upper thermostat will mean no hot water at all.
When the lower thermostat acts up you will have hot water, just not very much. The upper thermostat will always have a reset button. Sometimes the lower one will have one to. This is a red button that pops when the thermostat overheats.
How to Install a 120-Volt, 20 Gallon Electric Water Heater
The thermostats also have temperature settings on them. Hot water heaters are set at the factory to degrees. Open the valve on the main line that feeds cold water into the water heater. Allow the water to fill the tank, then flow out through the hot water line and through the spigots in your home. Allow the water to flow through the spigots for about a minute to bleed air that's trapped inside the lines, and turn off the taps. Remove the metal plate on top of the water heater that conceals the wiring. Pull out the wires that are in the tank. Strip a half-inch of insulation off of the wires with wire strippers.
Punch out the knockout hole next to the wires by tapping on it with a hammer and screwdriver. Connect a cable connector to the knockout hole with a wire nut. The cable connector covers the knockout hole and has a screw on the side that locks the electrical cable in place, preventing it from sliding around, which can damage the insulation. Insert the cable that runs to the main electrical panel through an electrical conduit.
How to Hook Up an Electric Hot Water Tank
Slide the end of the cable through the cable connector and into the top of the water heater until the wires from the cable can be connected to the wires inside the water heater. Insert the end of the conduit into the cable connector and tighten the screw on the cable connector. Twist the red wire from the water heater to the red wire from the electrical cable with a pair of pliers.
Place a plastic twist cap onto the wires and twist it several times. Connect the black wires together, using the same method.