Daox, Water heaters may collect sediment in bottom of tank, if sediment doesn't harden then draining should be sufficient. When sediment hardens it creates a insulation barrier to the heat source and creates ineffiency. When you decide that a hardening is present and want to clean it, you may have to use chemicals to breakdown the sediment and flush. Continued accumulation of hardened sediment can damage the glass lining and lead to rust out.
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