Originally Posted by Wlfman
Never ceases to amaze me. People will religiously maintain their vehicles but do not perform regular maintenance on their house. Water heaters should be drained and flushed at least once a year and more often if you have hard water or lots of sediment in your water.
That is true. However, if done improperly the water heater will be damaged. Much like furnace maintenance, not everyone should do this.
The primary problem is not shutting off the heat to the water heater when draining. If the gas or electricity is disconnected, the water heater will not be damaged when drained. Although, there is no guarantee the drain valve will not start leaking.