A hot water heater suddenly stopping working can stem from several distinct mechanical and electrical failures depending on the unit type. For electric storage tanks, culprits include tripped circuit breakers, burned-out heating elements, or a tripped high-limit thermal switch. For gas storage tanks, common causes are an extinguished pilot light, a faulty thermocouple, or a closed gas valve. Tankless units typically stop working due to power interruptions, blocked inlet filter screens, or flow sensor failures. Verification: Inspect electrical circuit breakers, gas control valves, and digital display panels to identify the specific failure source.
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