A sudden drop in water temperature is usually triggered by a failing heating element, a broken dip tube, or an incorrect thermostat setting. On electric water heaters, dual elements work together; if the lower element fails, only the top portion of the tank heats water, cutting your hot supply in half. On gas units, sediment buildup creates a barrier between the burner and the water. Additionally, a broken dip tube allows incoming cold water to mix instantly with stored hot water. Verification: Test heating element continuity and inspect thermostat dials.
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