Part 2/9:
At its core, a conventional electric water heater is a simple device—essentially just a well-insulated cylindrical tank coupled with two heating elements. One of the label details indicates the second wattage applies when the unit is connected to a 208V electrical supply, common in commercial buildings. Using Ohm's law, we can deduce that each heating element has a resistance of 12.8 ohms, producing 18.75 amps at a power output of 4500 watts. However, when operating at 208V, that current drops to 16.25 amps, resulting in a lower power output of 3380 watts.