A lot of tankless repair calls in Renfrew turn out to be a descaling issue rather than a failed part once the technician looks closer.
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Quick answer
Tankless water heater repairs in Renfrew typically run $250 to $900, with a routine descaling service running $250 to $450. These are 2026 market ballparks, not a quote — CANRO confirms the exact price once a technician has diagnosed the unit.
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.
Tankless units display error indicators when something's wrong, which is useful for diagnosis but can make a minor fault feel urgent. Reduced flow or fluctuating temperature is often scale buildup on the heat exchanger rather than a broken part, especially in units that have gone a few years without a descaling service. A full lockout, on the other hand, is more likely to be an ignition or flow-sensor fault that needs an actual part.
Renfrew's Vancouver reservoir water supply is comparatively soft, so scale accumulates more slowly here than in hard-water regions, but it still happens over time, particularly in units that have never been serviced.
| Service | Typical cost |
|---|---|
| Diagnostic / service call | $90–$150 (usually credited to repair) |
| Typical tankless repair | $250–$900 |
| Descaling / flush service | $250–$450 |
A well-maintained tankless unit typically has a long useful life and most repairs are worth doing. The exception is a heat exchanger failure on a unit that's already had multiple repairs — at that point the repeated repair cost starts approaching what a fresh installation with full warranty coverage would run, and CANRO's technicians will point that out directly rather than continuing to patch an aging unit.
A tankless unit rarely fails without some warning first. Hot water that takes noticeably longer to arrive, temperature that drifts instead of holding steady, or a subtle drop in flow at more than one fixture are the early signs of scale buildup rather than an outright fault. Catching these before the unit locks out entirely usually means the fix is a straightforward descaling service rather than a part replacement, and it's generally the cheaper path overall.
If the unit is still under manufacturer warranty, it's worth checking whether documented descaling on a regular schedule is a condition of that coverage — some warranties require it, and skipping the maintenance can affect a future claim even for an otherwise-covered part.
Safety note
Repairs involving the gas connection, burner, or venting on a tankless unit must be performed by a Technical Safety BC licensed gas fitter — CANRO holds gas licence LGA0043870. If you smell gas near the unit, leave the home and call FortisBC at 1-800-663-9911 from outside.
That's often a sign of scale buildup affecting flow through the heat exchanger, which a descaling service typically resolves.
Roughly every one to two years is reasonable given the area's relatively soft reservoir water, though household usage affects the ideal interval.
No — error codes point toward a category of fault, but a technician needs to inspect the unit in person before pricing the actual repair.
Some homeowners do a basic flush, but a professional service also inspects the burner and venting, which a DIY flush skips.
When an older unit has had repeated repairs, particularly involving the heat exchanger, replacement often becomes the better long-term value.
No, it's a ballpark from current public market data. CANRO confirms the exact repair cost after diagnosing the unit.
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