What replacing a tankless water heater's flow sensor costs in Port Coquitlam, and why sediment is usually the real story.
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Quick answer
A tankless water heater flow sensor replacement in Port Coquitlam typically costs $250–$900 in parts and labour, including the standard $90–$150 diagnostic visit. That's a 2026 public-market ballpark, not a firm quote — CANRO's technicians confirm the actual cost after inspecting the sensor and checking for sediment in the line.
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A tankless water heater has no standing tank of hot water waiting for you — it has to detect that water is actually moving through it before it decides to fire the burner. The flow sensor, usually a small turbine wheel that spins as water passes, is what tells the control board 'someone just opened a tap, start heating.'
Below a minimum flow rate, most units simply won't fire at all, which is intentional — there's no point heating water that isn't really flowing anywhere.
| Item | Typical range (CAD) |
|---|---|
| Diagnostic / service call | $90 – $150 (usually credited to the repair) |
| Licensed labour | $95 – $165 per hour |
| Flow sensor, parts and labour | $250 – $900 |
Because the flow sensor and the inlet filter sit close together in the water path, a competent technician typically checks and cleans the filter before condemning the sensor. If sediment was the real cause, clearing it can restore normal operation without replacing the sensor at all — which is worth confirming before paying for a part you might not need.
A flow sensor issue is unrelated to the overall age or condition of the tankless unit and is treated purely as a repair. It's one of the more common small parts to need attention over a unit's service life, especially in homes without a sediment or particle filter ahead of the water heater.
Homes on Port Coquitlam's older galvanized or original copper supply lines — more common in the pre-1990s housing stock around Lower Mary Hill and parts of Central Poco — can shed small amounts of internal pipe scale into the water over decades, which is exactly the kind of debris that fouls a flow sensor or inlet filter. If your home hasn't had its supply piping updated, mentioning that history to your technician can help target where the sediment is likely coming from. Newer construction on updated copper or PEX lines tends to introduce far less internal debris over the same time span, so flow sensor fouling from sediment is comparatively less common in those homes.
Safety note
Flow sensor service is done in close proximity to the unit's gas and venting connections, so it should be handled by a Technical Safety BC licensed gas fitter. If you ever notice a gas odour near the water heater, leave the house and call FortisBC at 1-800-663-9911.
If flow is below the unit's minimum threshold — often due to a clogged inlet filter or a jammed flow sensor — the unit won't fire at all, which is normal safety behaviour rather than a random glitch.
Often yes, especially if sediment is the cause. A technician will typically clean the filter and flush debris before concluding the sensor itself needs replacing.
They can look similar to a homeowner, but low household water pressure and a fouled flow sensor are different problems with different fixes — a technician can measure actual flow to tell them apart.
Older supply piping can shed more internal debris over time, which is a plausible contributor to sediment-related flow sensor and filter issues, though it's not the only possible cause.
There's no fixed schedule; it depends heavily on water quality and whether a sediment filter is installed ahead of the unit.
Not directly — a flow sensor issue typically causes the unit to not fire or under-fire rather than affecting the target temperature setting, so a temperature complaint alone points elsewhere.
It's a reasonable preventive step for homes with older piping or known sediment issues, and it can reduce how often the tankless unit's own inlet filter and flow sensor need attention.
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