When your cold water functions normally but you have zero hot water coming from your taps, the issue is isolated exclusively to your water heating system rather than the main municipal supply line. For electric water heaters, this is typically caused by a tripped high-limit thermal switch, a blown fuse, a tripped circuit breaker, or a burned-out upper heating element. For gas water heaters, it frequently stems from a extinguished pilot light, a failing thermocouple, a closed gas supply valve, or a malfunctioning gas control valve. Verification: Inspect your water heater's power source and test the electrical elements or gas pilot assembly.
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