When your home experiences a sudden loss of hot water, the very first thing to check is the power source or energy supply feeding the water heater. For electric water heaters, head to your home's main electrical breaker panel to verify that the dedicated circuit breaker hasn't tripped; if it has tripped, reset it once, but leave it alone if it immediately trips again. For gas water heaters, check the gas supply shut-off valve to ensure fuel is flowing and inspect the burner compartment to see if the pilot light has gone out or if an electronic error code is flashing on the control valve. Checking these basic utility feeds first saves time before diving into internal mechanical or thermostat diagnostics.
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