Many gas water heaters with standing pilots keep working during a power outage, but newer electronic-ignition tank models and most tankless units do not.
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Quick answer
Whether a gas water heater keeps working during a power outage depends on its ignition type: a traditional storage tank with a standing pilot light generally continues heating water without electricity, since it doesn't rely on power for ignition or basic operation. Newer electronic-ignition storage tanks and the large majority of tankless gas water heaters do require electricity, for ignition, electronic controls, or the digital display, so most tankless units and many newer tank models will stop working when the power goes out. Knowing which type you have before an outage happens is far more useful than trying to figure it out during one.
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| Water heater type | Works during outage? | Why |
|---|---|---|
| Storage tank, standing pilot | Usually yes | Pilot stays lit without power; no electrical ignition needed |
| Storage tank, electronic ignition | Usually no | Requires power to ignite the burner |
| Tankless, most models | Usually no | Requires power for ignition, flow sensing, and controls |
| Indirect tank tied to a boiler | Depends on the boiler | If the boiler needs power, so does the indirect tank's heat source |
Look at your water heater during normal operation: if you can see a small, continuously burning pilot flame through a viewing window near the bottom of a storage tank, and there's no digital display or electronic control panel, it's likely a standing-pilot model that will continue heating during an outage. If your unit has a digital display, requires pressing an electronic ignition button, or is a tankless unit mounted on the wall, it almost certainly needs power to operate, and a technician can confirm this definitively if you're unsure.
Electronic ignition systems generally offer better safety monitoring, more precise temperature control, and improved efficiency compared to older standing-pilot designs, which is why they've become standard on newer tank models and are essentially universal on tankless units. The trade-off of losing power-outage independence is a genuine one, but it's balanced against real gains in safety and performance that most homeowners benefit from during the vast majority of the time the power is on.
If your electronic-ignition tank or tankless unit stops during a power outage, there's generally nothing to do but wait for power to return; the unit should resume normal operation automatically, though tankless units occasionally need a brief reset if the outage caused an error state. Avoid repeatedly cycling the unit's power or reset if it doesn't immediately resume normal operation once power is back, and call a technician if it doesn't recover on its own within a reasonable time.
If frequent power outages are a concern in your area, and reliable hot water during those outages matters to your household, a backup generator sized for your water heater's electrical needs is worth discussing with an electrician and gas fitter together. This is a more relevant consideration for households with specific needs, such as medical equipment sterilization or infant care, than it is for most typical households, where a temporary loss of hot water during a short outage is an inconvenience rather than a significant problem.
If your home still has an older standing-pilot water heater and it continues to work well, that outage independence is a genuine, if minor, advantage worth knowing about, but it shouldn't be the only factor in deciding whether to keep an aging unit versus replacing it, since overall condition, efficiency, and remaining service life matter more for most households' day-to-day experience.
Safety note
Never attempt to manually light or bypass a gas water heater's ignition system. Confirming your unit's ignition type and any generator sizing for backup power should involve a Technical Safety BC licensed gas fitter. CANRO holds gas licence LGA0043870. If you ever smell gas, whether power is on or off, leave the home and call FortisBC at 1-800-663-9911.
Check whether it has a standing pilot flame visible through a viewing window and no digital display, which usually means it will keep working, versus an electronic display or tankless design, which usually means it needs power.
The large majority do, since tankless units rely on electronic ignition, flow sensing, and controls that require electricity to operate.
It's rarely worth trading the safety and efficiency benefits of electronic ignition for outage independence alone; a backup power plan is usually a better solution if reliability during outages matters to you.
Generally no, a short outage doesn't damage the unit itself, though a tankless model may occasionally need a brief reset once power returns.
For most households a short outage without hot water is a manageable inconvenience, though households with specific medical or infant-care needs may find a sized backup generator worthwhile.
Electronic-ignition units should never be manually bypassed; if your unit isn't restarting normally after power returns, call a licensed technician rather than attempting to force it.
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