Anyone can drain a water heater, and the task does not require a plumber. Draining a water heater removes built-up sediment that causes the heater to run inefficiently.
The first step in draining a water heater is to disconnect the power and water and wait several hours for the water to cool. The next step is to open the pressure-release valve and place a bucket under it to catch leaks. Finally, connect a hose to the drain, and feed it outside the house or into a container. Once the tank is drained, disconnect the hose, and restore the power and water supply.