Suddenly running out of hot water faster than usual or experiencing an abrupt total loss can be caused by a broken or cracked dip tube inside the tank, which forces incoming cold water to mix instantly at the top with hot water rather than sinking to the bottom. Other causes include a failed lower heating element on electric units, a malfunctioning gas burner, or a massive simultaneous draw from multiple high-demand fixtures like washing machines and showers exceeding the tank's recovery capacity. Verification: Check hot water recovery rates and inspect the dip tube if output remains lukewarm.
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