Underneath almost every tankless water heater complaint, sooner or later, the same culprit shows up: minerals in the water. Every litre that passes through the heat exchanger leaves a trace behind, and over years those traces build into scale that narrows the water passages, throws off temperatures, trips flow errors, and eventually locks the unit out entirely. How fast that happens depends on the household. A family of five in a Burke Mountain home pushing three bathrooms through one unit accumulates scale faster than a couple in a Burquitlam townhome. Metro Vancouver's municipal water is moderate in mineral content, which means most Coquitlam homes build scale at a steady but manageable pace. The households that get 15 to 20 years out of a tankless unit are almost always the ones who dealt with scale early instead of waiting for a lockout to force it.

Descaling is the answer, and it deserves a straight explanation because it gets oversold in this trade. The service flushes a cleaning solution through the heat exchanger to dissolve the buildup and bring flow and temperature stability back. Done when a unit needs it, descaling is the single cheapest thing you can do to extend the life of the equipment. It is a standalone service here, booked and priced on its own, never bundled into a diagnostic or slipped into a maintenance package. We check the heat exchanger's condition during every diagnostic and recommend descaling when the evidence says so, which for some households means regularly and for others means rarely. What we will not do is put every customer on the same calendar and call it maintenance.

The other failures are components wearing out through years of use, and how a unit arrived in the home tells you what to expect. Across Maillardville, Austin Heights, Central Coquitlam, and Ranch Park, most tankless units came through renovations over the past decade: a homeowner swapped an aging tank for an on-demand unit, and those systems now have real hours on them. Flame rods foul from years of ignition cycles. Flow sensors drift out of calibration. Ignition boards reach the end of their run. On Burke Mountain, where some builders fitted tankless units from day one, the systems are younger, and when they act up, the cause sometimes traces back to the original install, a gas line sized tight or venting done to the minimum, rather than the unit itself. We service the full Coquitlam area across both categories.

One common mix-up is worth clearing up. If a single wall-hung unit heats both your house and your hot water, that is a combi boiler, a different appliance with different failure patterns, and it belongs on our boiler repair page. A tankless water heater handles domestic hot water only, and the diagnostic approach, the parts, and the brands are distinct. Knowing which one you have before booking saves everyone time.

Brand fluency is the difference between one visit and two. Each manufacturer has its own fault codes, its own sensor quirks, and its own diagnostic sequence, and a technician who sees these units every week reads them faster and more accurately than one who encounters them occasionally. Technical Safety BC licence LGA0200006, FortisBC Trade Ally, BBB A+, HPCN registered, WorkSafeBC covered, and 400-plus Google reviews at 4.9. Parts are CSA certified, and the six-month warranty covers the part and the labour together.

Some units reach the end of the road, usually through a failing heat exchanger or a fault that keeps returning no matter what gets replaced. At that point we put a replacement quote beside the repair quote so you can compare on real numbers. New installations come from Navien and Rinnai, in condensing and non-condensing configurations, including models with built-in recirculation that ends the long wait for hot water at the far end of a large home. And for households whose tankless experiment never quite fit, going back to a hot water tank is a legitimate answer, not a defeat. We install both, so the advice follows what your household actually needs.