Step 7 · Restore Power and Test
Once you have confirmed that the tank is completely full and there are absolutely no leaks, you can safely restore power. Return to the electrical panel and flip the water heater's circuit breaker back to the 'ON' position. You may hear a faint humming or hissing sound from the tank, which is the new element heating the water. The process is now complete. You will need to wait for the water to heat up, which can take an hour or more depending on the tank size and the incoming water temperature. Check a hot water faucet periodically until the water runs hot.
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