Experiencing insufficient hot water is typically caused by heavy mineral sediment accumulation at the bottom of the tank, a broken dip tube that allows cold water to mix prematurely with hot output, or an electric water heater with a burned-out lower heating element. Over time, calcium scale creates an insulating barrier that reduces heating efficiency, while a cracked dip tube drastically shortens the tank's thermal reserve capacity. Verification: Flush the tank to remove sediment and check lower heating element electrical resistance.
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