Most gas tankless water heaters need a standard electrical outlet to power ignition and controls, not to heat the water itself.
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Most gas tankless water heaters need a standard household electrical connection, typically a dedicated outlet, to power the electronic ignition system, control board, and internal fan used for combustion air and venting. The electricity does not heat the water, the gas burner does that, but without power the unit cannot ignite or run its safety controls at all. Some models specify a dedicated circuit, and the outlet's location and accessibility matter for future service, both of which a technician confirms as part of a proper installation.
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It's a common misconception that a gas tankless water heater doesn't need electricity because gas does the heating. In reality, nearly all gas tankless units rely on electricity for several functions unrelated to heating the water itself: the electronic ignition module that starts the burner, the control board that manages modulation and safety shutoffs, the flow sensor, and on many models a fan that draws combustion air in and pushes exhaust out through the venting.
Because of this, a power outage generally means a gas tankless water heater stops producing hot water entirely, even though gas is still available, since the unit's controls and ignition simply can't function without electricity. This is worth knowing if you're comparing a tankless unit to an older standing-pilot storage tank, which in many cases could still produce hot water during a power outage.
| Component | Typical requirement |
|---|---|
| Power connection | Standard household outlet, often on a dedicated circuit depending on the model |
| Grounding | Proper grounding required as with any electrical appliance |
| Outlet location | Within reach of the unit's power cord, accessible for service |
| Backup power option | Some homeowners add a small backup power source for continuity during outages |
Whether a specific model requires a dedicated circuit versus sharing a standard outlet circuit is documented by the manufacturer for that model, and a technician confirms this as part of planning the installation rather than assuming one universal requirement across all tankless units.
The outlet needs to be positioned so the unit's power cord reaches it without strain, and ideally in a location that remains accessible for future service without needing to move the unit. In retrofit installations, particularly in older Vancouver homes without an outlet already near the intended water heater location, adding one is a task for a licensed electrician and should be planned into the overall installation timeline and cost rather than assumed to already be in place.
Given how often winter storms in Metro Vancouver bring brief power outages, some homeowners consider a small backup power source, such as a battery backup or portable generator connection, specifically to keep their tankless water heater's controls running during an outage. This is an optional add-on rather than a standard requirement, and it's worth discussing with your technician if reliable hot water during outages matters to your household, since the appropriate solution depends on the unit's actual power draw and your home's electrical setup.
Before installation, it's worth confirming with your technician whether your chosen tankless model needs a dedicated electrical circuit, whether an outlet already exists near the planned installation location, and whether any electrical work needs to be coordinated with a licensed electrician ahead of the gas fitter's installation day. Sorting this out in advance avoids a scheduling delay if electrical work turns out to be needed but wasn't accounted for in the original plan.
Safety note
Gas connection and venting work for a tankless water heater must be performed by a Technical Safety BC licensed gas fitter, and any electrical work should be performed by a licensed electrician. If you ever smell gas or suspect a carbon monoxide issue, leave the home immediately and call FortisBC at 1-800-663-9911.
Generally no, since the ignition, control board, and often a combustion air fan all rely on electricity, so most units will not produce hot water without power even though gas is still available.
Some models specify a dedicated circuit while others can share a standard outlet circuit, so check the manufacturer's documentation for your specific model or ask your technician to confirm.
Electrical work should be done by a licensed electrician, particularly in older homes where the existing wiring and panel capacity need to be properly assessed before adding a new circuit or outlet.
It's optional, not a standard requirement, but some homeowners choose one specifically to maintain hot water access during power outages, particularly in storm-prone winter months.
A standing-pilot storage tank in many cases doesn't rely on electricity to ignite, while most tankless units need power for ignition, controls, and often a combustion air fan, which is a meaningful difference between the two types.
Close enough for the unit's power cord to reach without strain, and in a position that stays accessible for future service without needing to relocate the unit.
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