
Shut off the power and the cold-water supply valve. Place a bucket under the pipe connected to the temperature-pressure-release (TPR) valve on the top or side of the tank. (This valve opens if the tank pressure gets too high.) Lift the valve's tab to let some water out, then let go. If water keeps flowing, drain the tank partway, unscrew the old valve with a pipe wrench, and install a new one.
Drain the remaining water in the tank into the bucket, then stir up the sediment on the tank's bottom by briefly opening the cold-water supply valve. Drain and repeat until clean water comes out of the hose. Close the drain cock, refill the tank, and turn its power back on.
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