Yes, standard gas and electric tankless water heaters will stop working completely when the electrical power goes out. Unlike traditional storage tank water heaters that rely on mechanical gas valves and millivolt thermocouples to keep standing pilot lights lit without electricity, tankless water heaters require continuous electrical power to run their internal computer control boards, digital display interfaces, motorized water flow control valves, and electronic ignition systems. Furthermore, power-vented tankless units rely on electric exhaust blower fans to vent toxic combustion gases safely outdoors. If your home loses power, the unit cannot detect water flow or ignite burners. Verification: Check the digital display panel to confirm it is dark and test hot water taps during a power outage.
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