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!