A sudden, unexpected loss of hot water across your entire home is almost always triggered by an acute equipment failure or safety shutdown. In electric water heaters, a power surge or severe internal overheating causes the high-limit thermal reset switch to trip, cutting power instantly. In gas water heaters, a draft can blow out the pilot light, or a failing thermocouple can shut off the gas valve. Additionally, a severe internal plumbing leak or a broken dip tube can disrupt normal hot water delivery. Verification: Check the water heater reset button and verify gas or electrical supply to the unit.
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