Turn off the power to the water heater (electric) or set the gas control to “OFF” (gas)
Close the cold-water supply valve to the water heater
Connect a garden hose to the drain valve at the bottom of the tank
Run the other end of the hose to a floor drain, outside area, or a bucket large enough to hold the water
Open a hot water faucet in the house (to relieve pressure and allow the tank to drain)
Open the water heater drain valve slowly
Open the temperature and pressure (T&P) relief valve if needed to improve flow
Allow the tank to drain completely
Keep an eye on the discharge area to prevent spills or overflows
Close the drain valve when finished
Close the hot water faucet
Open the cold-water supply valve slowly
Turn the power back on (electric) or set the gas control to “ON” (gas)
Check for leaks at the drain valve and connections
Verify hot water is available at a faucet