A homeowner's guide to what a tankless water heater repair actually costs in Kerrisdale, and the faults we see most.
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Quick answer
Tankless water heater repairs in Kerrisdale typically run $250–$900, plus a $90–$150 diagnostic/service call that's usually credited toward the fix. That's a ballpark figure from 2026 public market data, not a quote — CANRO's certified gas technicians confirm the real price once they've read the unit's fault code and checked the venting and gas supply.
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 that were installed with the original build in newer condos near West 41st tend to run for years with minimal trouble, since venting and gas sizing were done right the first time. Where we see more repair calls is in older character homes where a tankless unit was retrofitted into a space that wasn't originally built for it — venting routed through a tighter path, or a gas line that's marginal for the unit's peak draw.
Typical faults include a flow sensor that's stopped registering water movement, an igniter or flame sensor going bad, a blocked or partially obstructed vent termination (leaves, debris, or nesting insects on an exterior wall vent), and error codes tied to water pressure or gas supply fluctuation.
| Fault type | Typical range |
|---|---|
| Diagnostic / service call | $90–$150 (credited toward repair) |
| Sensor, igniter, or minor part replacement | toward the lower-to-mid $250–$900 range |
| Circuit board, gas valve, or heat exchanger component work | toward the upper end of $250–$900 |
Most tankless faults are component-level and worth repairing, especially on a unit under about ten years old. If the heat exchanger itself has failed — which shows up as persistent error codes even after sensors and valves are replaced — that's usually a signal to talk replacement instead of chasing repeated repairs on an aging unit.
A unit that's throwing the same error repeatedly despite prior repairs is also worth a second look at the installation itself, not just the equipment — an undersized gas line or a marginal vent run can cause symptoms that look like a failing part but keep recurring after it's replaced.
Safety note
Tankless water heaters run on natural gas and vent combustion exhaust directly outside — any repair involving the gas valve, burner, or venting must be done by a Technical Safety BC licensed gas fitter. If you smell gas, leave the home and call FortisBC at 1-800-663-9911.
This is often a flow sensor or minimum flow-rate issue, sometimes tied to a low-flow fixture elsewhere in the house — a technician can diagnose which it is during the service call.
Clearing debris from an accessible exterior vent cap is something a homeowner can sometimes do carefully, but if the blockage is inside the vent run or the unit is still faulting after clearing it, that's a job for a licensed technician.
There's no hard cutoff, but once a unit is well past ten years and needs a major component like the heat exchanger, the repair cost starts to approach what a portion of a new install would cost.
It helps reduce scale-related faults specifically, but doesn't prevent electronic, ignition, or venting issues, which are the more common calls we see.
Yes — a tankless unit added into an older house after the fact sometimes has a marginal gas line or vent routing, and that can show up as recurring faults years later even though the unit itself is fine.
Confirm the unit has power, the gas shutoff is fully open, and note any error code shown on the display — that information speeds up the diagnostic visit.
Many manufacturers expect documented periodic descaling as a condition of warranty coverage, so keeping a service record matters even with Vancouver's comparatively soft water.
A handful of component repairs over a ten-to-fifteen-year lifespan is normal wear rather than a sign of a bad unit, provided the underlying installation is sound.
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