Step 9 · Restore Power
With the tank completely full of water and all air purged, you can now safely restore power. Return to the electrical panel and flip the water heater's breaker back to the 'ON' position. The water heater will now begin to heat the new water. It will take 1-2 hours for the water to become fully hot again. For a gas heater, you would turn the gas control knob back to 'ON' and follow the manufacturer's instructions for relighting the pilot light, if necessary.
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