Which step must you do first when replacing a heater element on a water heater?

When replacing a heater element on a water heater, the first step is to de-energize the water heater. This action is critical for safety before performing any repairs. By disconnecting the power, you eliminate the risk of electric shock that could occur if you were to accidentally come into contact with the live electrical components while working inside the water heater.

De-energizing ensures that there are no active electrical currents present, allowing you to safely access the heater element without the danger of electrical hazards. It sets a safe foundation for any subsequent steps, such as draining the water heater or checking for voltage, which should only be performed once you are certain that the unit is no longer powered.