Wiring Up Electric Hot Water Heater Most home hot water heaters are powered by a 240-volt circuit. While all voltages are dangerous, it is this particular voltage which is most notorious for causing severe injury or death. It is extremely important that the circuit be OFF when wiring an electric water heater.
Wiring Up Electric Hot Water Heater Electric hot water heaters typically require a dedicated 30-amp, 240-volt breaker. The wire supplying power from the breaker panel to your water heater will usually be a 10/2 Romex cable (Blk wire- hot, Marked White wire - hot, Bare copper wire - ground). Since a water heater has no outlet, the cable will be run from the wall to the junction box on the water heater.
Wiring Up Electric Hot Water Heater Understanding Electric Water Heater Wiring. Most hot water heaters are on a 30 amp two pole breaker. The two poles means it is a stated 240 volts or an actual 230 volts. As long as your water heater is not too far from the panel it will be wired with #10 wire. This is the common format for wiring an electric water heater, but it is not the only one.
Wiring Up Electric Hot Water Heater Electric water heaters require a 240-volt dedicated circuit, which serves only the water heater and no other appliances or devices. The circuit wiring typically includes a 30-amp double-pole breaker and 10-2 non-metallic (NM) or MC cable.