How to Splice Your Water Heater Wiring

Water heater wiring is usually done by technicians. However, there are some rare occasions when someone needs to do the wiring themselves. When this happens, it is necessary to follow a few pointers. Electric water heaters are available in two models: 120-volt and 240-volt. A 240-volt model is a wiser choice since it costs just the same as a 120-volt model. A 240-volt also uses just half the current a normal 120-volt model consumes. Safety is always a top priority when personally wiring the water heater. The following steps should help successfully splice water heater wiring.

Step 1 - Measure the Current

Using the voltage tester measure the current of the water heater’s pipes. For cable installation purposes, note the metal pipes and ducts. It is important to make sure all pipes and ducts are correctly grounded. It is necessary to at least fix a bonding jumper connecting the inlet and outlet pipes. This connection will be wired to the water heater.

Step 2 - Connecting to the Breaker

The main breaker in the service panel should be turned off. A 30-amp circuit should be installed given there isn’t any in the water heater. Black and white wires should be connected to the breaker. As a precautionary step, the ends of the white wire should be wrapped using an electrical tape. This will help indicate that the wire is hot. If the water heater is not evident from the service panel, a 30-amp load disconnect switch should be installed near the heater. If the heater is located within the living area, cable connecting the switch and the heater should be hidden within the metal conduit.

Step 3 - Install NM Connector

The cable can be connected to the heater with the use of an NM connector. The ground wire is attached to the green grounding screw. Wires from the heater should be spliced with the wires in the service panel. The spliced wires can now be attached to the insulated connectors. White wires should be wrapped with black tape.

Step 4 - Preparing the Heater

The heater’s electrical box should be properly sealed. Connect the water piper to their designated positions before using the heater. Prior to turning the heater on, the tank should already be filled with water. If the tank is not filled with water beforehand, the components of the heater may get damaged.

Step 5 - Turn it On

To test whether the wiring system of the heater has been successfully spliced, turn on the water heater. The thermostat can be adjusted according to the desired temperature.