Step 1: Turn off the Water Supply
If you have an electric water heater, turn off the power at the breaker-box. If yours is a gas heater, turn the thermostat to the “pilot” setting. Connect a hose to the drain valve located close to the thermostat, but don’t open the valve yet. Turn off the cold-water supply that feeds the water-heater.
Step 2: Drain the Hot Water
Inside your house, open up one of the hot-water faucets in one of your sinks or tubs. This will prevent a vacuum from forming in the lines. Go back to the water-heater, and open the drain valve to drain the hot water out of the tank. Make sure the far end of the hose is draining somewhere that won’t be harmed by hot water. An outside driveway is ideal.
Step 3: Flush out the Remaining Sediment
Once the water stops flowing out of…
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