Do you know where your main water shutoff valve is located in case of and emergency?
Most main water shutoff valves are located in a basement, 1st floor closet, under house crawl space or garage.
Here are a few examples of main water shutoff valves.
Ball Valve
Gate Valve
101 on how to drain a Water Heater ?
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 the far end of the hose, turn the water
supply back on. This will flush out any remaining sediment left behind
in the heater. Once the water runs clear from the end of the hose, close
the DRAIN valve. Don't forget to turn the hot-water faucet inside your
house back off. The heating element could possibly blow if there is no water in
the tank. Some tanks may need to be completely full in order to prevent
damage. When in doubt, always read the warnings and instructions on the
tank label carefully because each tank may vary!
Step 4: Test the Pressure-Release Valve Turn
the power-supply to the water heater back on at the breaker box (or the
thermostat), after the tank has filled with water. Once the water
temperature has been brought back up, test the pressure-relief valve
according to the manufacturer's instructions. This safety device is
designed to prevent excess pressure build-up or overheating inside the
tank. If it's faulty, you may need to have it replaced by a licensed
plumber.