Does the tank need to be periodically cleaned out?

Does the tank need to be periodically cleaned out?

Check the instruction manual of the individual tank you own. 
It is recommended to clean the inner tank and E-Heater regularly to maintain efficient performance. (see below an example from maintenance manual
• Turn off the power.
• Close the cold water inlet valve & open a hot water tap.
• Use a flexible pipe to connect the drain port to a suitable sewage drain
• Open the drain port of the water heater; drain out all the water in the inner tank. If it is needed, use water to wash the inner tank several times to clear the deposits.
• Close the drain port, re-fill the inner tank with water, and turn the power back on.

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