The single most common cause of a total loss of hot water in a home is a tripped high-limit thermal safety switch or a burned-out heating element in electric water heaters, and a extinguished pilot light or faulty thermocouple in gas water heaters. Over time, electrical components wear out, sediment buildup overheats elements, and thermocouple sensors degrade. Furthermore, heavy simultaneous hot water usage can deplete the tank's thermal reserve faster than the unit can reheat incoming cold water. Verification: Inspect the water heater control panel, check breakers, and test elements.
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