A gas burner supplies the heat in a gas water heater, but that does not tell you whether the whole appliance can run during a power outage. The answer depends on the particular model.
Different designs need different power
Some older storage heaters use a standing pilot and may keep operating without household electricity. Other gas models use electronic ignition, powered controls, a fan, or a powered vent. Many tankless heaters need electricity for controls and safety systems even though gas provides the heat.
Check the model label and owner’s manual rather than assuming that every gas heater will work without power. If hot water is essential during an outage, discuss the heater and any backup-power option with a qualified professional before buying equipment.
Keep the appliance safe
Do not bypass controls or try to relight a unit by improvising with a match or lighter. Follow the manufacturer’s instructions and arrange service if the heater does not resume normal operation after power returns. Our water-heater team can help identify the system you have.
Plan around the exact appliance
The rating label and manual can tell you whether the heater has an electrical connection, a power vent or electronic controls. If you are considering backup power, ask a qualified installer which parts of the hot-water system need it and whether the backup arrangement is suitable for the appliance. A battery or generator that can run one control does not necessarily make the entire installation safe or functional.
When shopping for a new heater, include outage behaviour among your questions rather than assuming “gas” means independent of electricity. Our guide to choosing a water heater covers the broader fuel, capacity and installation tradeoffs. If you smell gas at any point, leave the building and follow FortisBC’s gas-leak instructions.