The combustion fan pulls air through a tankless unit for proper burning and venting, and a failing one often shows up as a specific fan-speed fault code.
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Quick answer
Combustion fan replacement on a gas tankless water heater in West Vancouver typically falls within the $250 to $900 tankless repair range, plus a $90 to $150 diagnostic visit and $95 to $165 hourly labour if extra time is needed. This is a 2026 ballpark from public market data, not a fixed quote, and CANRO's technicians confirm the exact cost once the fan and venting have been tested.
Need a licensed gas fitter for your tankless water heater? Call CANRO at (604) 359-1081 — residential natural-gas heating and hot water across Metro Vancouver since 1999.
A gas tankless water heater relies on a combustion fan to pull the right amount of air through the burner for clean combustion and to push exhaust out through the venting, and it monitors that fan's actual speed continuously as a safety check. Unlike a tank water heater's natural draft venting, a tankless unit's forced combustion design means the fan is essential to every single firing cycle, not just an add-on for tight spaces.
When the fan's motor wears out, its bearings get noisy, or its speed sensor reports an inconsistent reading, the unit's control board typically responds with a specific fan-related fault code and either reduces output or shuts down the burn entirely rather than risk incomplete combustion. A tankless unit that intermittently drops out mid-shower, or shows a fan or airflow fault code on its display, points fairly directly at this component.
| Item | Typical range (CAD) |
|---|---|
| Diagnostic / service call (often credited to the repair) | $90 - $150 |
| Licensed gas technician labour, per hour | $95 - $165 |
| Combustion fan repair or replacement, typical | $250 - $900 |
A straightforward fan motor swap on a common tankless model sits toward the lower end. Cost rises if the fan assembly is a brand-specific part that has to be sourced, or if venting issues, such as a restriction placing extra strain on the fan, contributed to premature failure and need addressing at the same visit.
A fan-related fault code does not always mean the fan itself has failed. A partially blocked vent termination outside the home, a sagging vent run, or excessive vent length beyond the manufacturer's rating can all cause the fan to struggle to reach its target speed even when the motor is mechanically sound. CANRO inspects the full vent path before replacing a fan, since a new fan working against the same restriction will eventually show the same fault.
Tankless water heaters are a common choice in West Vancouver's more compact and recently renovated properties, particularly around Ambleside and lower Dundarave, where reclaiming the floor space a storage tank would occupy is a real draw. These units are often vented through an exterior wall on a relatively short run, which is favourable for combustion fan longevity compared to long, complex vent paths.
On homes closer to the waterfront near Horseshoe Bay and Dundarave, salt-laden air can accelerate wear on any exterior vent cap and, over time, on components exposed to that air stream including the fan's bearings. CANRO checks vent terminations on these properties specifically during service visits given that added exposure.
Safety note
The combustion fan is directly tied to safe combustion and venting on a tankless unit. Do not attempt to bypass a fan or airflow fault code to force the unit to keep running. This is licensed gas fitter work under Technical Safety BC rules. If you notice a carbon monoxide alarm sounding or smell gas near the unit, leave the house and call FortisBC's emergency line at 1-800-663-9911.
It typically means the control board detected the combustion fan was not reaching or holding its expected speed, which can be caused by the fan itself or by a restriction somewhere in the vent path.
A grinding or unusually loud fan is a sign of impending failure and should be looked at promptly rather than left running, since it may stop functioning correctly with little further warning.
CANRO measures actual fan speed against the expected reading and physically inspects the vent run and exterior termination to distinguish a true fan failure from a venting restriction.
Cold intake air is generally not an issue for the fan itself, though ice buildup at an exterior vent termination in freezing conditions can restrict airflow and produce similar symptoms.
Fan wear is usage-related rather than tied to a particular age, though units with heavy daily use, such as larger households, will accumulate wear cycles faster.
With the correct part on hand, typically a couple of hours including testing combustion and confirming the fault code has cleared.
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