All-Brand Tankless Water Heater Repair on the North Shore
A tankless water heater locked out on an error code leaves a household with zero hot water and no stored reserve to fall back on. Unlike a failing hot water tank that gradually loses performance, a tankless lockout is immediate and total. On the North Shore, where many homes added tankless systems during renovations or boiler-to-tankless conversions over the past decade, these units are now accumulating enough service hours to develop the component wear and scale buildup that trigger faults. Eaton's Heating provides same-day tankless water heater repair and descaling across all North Vancouver neighbourhoods from our Coquitlam base via Highway 1 and the Ironworkers Memorial Bridge. We service all major tankless brands including Navien, Rinnai, Takagi, Noritz, Bosch, and Rheem. Every call starts with a $189 diagnostic, with parts typically starting at $150 to $200 per component.
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North Vancouver's tankless water heater installed base falls into three distinct categories, each with its own set of common failures and diagnostic requirements. The first is the Navien combi boiler, which provides both space heating and domestic hot water from a single wall-hung unit. These are common across the North Shore in homes that replaced aging hot water tanks and conventional boilers with a single system during a renovation. When a combi unit faults, the impact is doubled: the household loses hot water and heat simultaneously, making the repair urgent in any season. Diagnosing a combi requires testing both the heating loop and the domestic hot water circuit because a fault affecting one side can cascade to the other. The second category is dedicated tankless units added to single-family homes in Lynn Valley, Edgemont, Capilano, and Blueridge during renovations over the past decade. These systems handle hot water only and their failure modes centre on scale buildup, ignition component wear, and flow sensor drift. The third is builder-installed tankless systems in Lower Lonsdale's newer condo and townhome developments, where installation quality varies and problems sometimes trace to undersized gas supply or marginally compliant venting from the original build.
The component that fails most often in North Vancouver's tankless units is not a moving part. It is the heat exchanger's internal surfaces, where minerals from Metro Vancouver's water supply deposit gradually with every litre of hot water produced. These deposits narrow the passages that water flows through, restrict heat transfer, and eventually trigger temperature fluctuation, reduced flow, and error codes that lock the unit out. The rate of accumulation depends on the household's hot water volume: a family of five running three bathrooms through a single tankless unit builds scale faster than a couple in a Lower Lonsdale condo. Descaling flushes a solution through the heat exchanger to dissolve accumulated deposits and restore the unit's original flow capacity. It is a standalone maintenance service, separate from diagnostics and repair, and is not included in the standard service call. We assess heat exchanger condition during every diagnostic and recommend descaling only when the buildup warrants it.
Tankless diagnostics demand manufacturer-level knowledge that general plumbing skills do not cover. Eaton's Heating is Technical Safety BC licensed under LGA0200006, holds FortisBC Trade Ally status and BBB A+ accreditation, and is Home Performance Contractor Network (HPCN) registered. Our team carries full WorkSafeBC coverage. Our 400+ five-star Google reviews and 4.9 average rating reflect targeted component-level repairs on systems where the obvious answer and the correct answer are often different. We carry diagnostic tools for every major residential tankless brand and test gas pressure, water flow rates, ignition components, sensors, and control boards during every service call. All repairs use CSA certified parts backed by a six-month warranty.
For homeowners whose tankless unit is beyond cost-effective repair, we install new systems from Navien and Rinnai. Navien's condensing lineup includes models with ComfortFlow recirculation for instant hot water at every fixture, which is especially valuable in North Vancouver's multi-level homes where the distance from the tankless unit to the farthest bathroom can be significant. Rinnai's condensing and non-condensing models with optional built-in recirculation pumps round out the lineup. For homeowners considering a switch to a conventional hot water tank, we walk through the trade-offs: tanks cost less upfront but use more energy and corrode out every 8 to 12 years, while tankless units last 15 to 20 years with proper maintenance. We service furnaces, boilers, and all other HVAC systems across North Vancouver.
The diagnostic approach on the North Shore varies by system type. On Navien combi boilers common in North Vancouver's renovated single-family homes, we test both the space heating and domestic hot water circuits because faults can originate on either side and present as symptoms on the other. On dedicated Navien, Rinnai, and Takagi units, we focus on flow rates, ignition components, heat exchanger condition, and sensor calibration. In Lower Lonsdale's newer construction where tankless units were installed during the original build, we also check for gas line sizing and venting compliance issues from the initial installation that other technicians may not investigate.
When the cost of repairing an aging tankless unit approaches the cost of installing a modern replacement, the comparison is worth making. We present both options with clear pricing during the diagnostic. Visit our rebates page for information on any active incentive programs that may apply to a new tankless installation.
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Have a question about your HVAC system? Book an appointment using the form below, or call (604) 535-8434 for immediate help.
Yes. Our Coquitlam base connects to the North Shore via Highway 1 and the Ironworkers Memorial Bridge, reaching most neighbourhoods in 20 to 25 minutes. Tankless failures are treated as urgent because there is no stored hot water reserve when the unit locks out. We carry common tankless components including flame rods, flow sensors, ignition boards, and inlet filters on every truck. Call (604) 535-8434.
Scale-related issues and ignition component failures are the most common repairs on the North Shore, and addressing them typically costs $150 to $400 per component for parts and labour on top of the $189 diagnostic. Flow sensor replacements and inlet filter swaps fall in a similar range. Control board and gas valve work sit higher. Descaling, which addresses scale buildup inside the heat exchanger, is a separate standalone service priced independently from component repairs. We quote everything before starting, and all parts carry a six-month warranty.
It depends on the unit's flow rate capacity and the incoming water temperature. Tankless units are rated in gallons or litres per minute at a specific temperature rise. Running two showers simultaneously may exceed the flow capacity of a smaller unit, causing temperature drops or a lockout. In North Vancouver's multi-level homes where two or three bathrooms may run at the same time during morning routines, the unit's rated capacity must match the household's actual peak demand. If your system cuts out or fluctuates when multiple fixtures run, it may be undersized for your usage pattern rather than malfunctioning. Our diagnostic can determine whether the issue is a component failure or a capacity limitation.
Temperature fluctuation, sometimes called a cold-water sandwich, typically has one of three causes. Scale buildup inside the heat exchanger restricts flow and prevents the unit from maintaining a consistent output temperature. A failing flow sensor sends inaccurate readings to the control board, causing the unit to modulate incorrectly. Or the household's demand pattern, such as turning a second fixture on while the first is running, drops the flow rate below the unit's minimum activation threshold momentarily, causing the burner to cycle off and restart. The specific cause determines the fix: descaling for scale, sensor replacement for sensor drift, or a capacity assessment if the issue is demand-related. Our $189 diagnostic identifies which applies.
Yes. Unlike a conventional hot water tank with a standing pilot, a tankless water heater requires electricity to power its electronic control board, ignition system, flow sensor, and exhaust fan. During a power outage, the unit will not fire and you will have no hot water. Some homeowners install a battery backup or connect the unit to a generator circuit to maintain hot water during the winter storms that occasionally affect power on the North Shore. If your household relies on uninterrupted hot water during outages, this is worth discussing during your next service call.
Tankless units typically last 15 to 20 years with proper maintenance, roughly double the 8 to 12 year lifespan of a conventional hot water tank. The heat exchanger is the component that ultimately determines lifespan, and regular descaling to remove mineral deposits extends its service life significantly. Individual components like flame rods, flow sensors, and ignition boards may need replacement during the unit's life, but these are targeted repairs that cost a fraction of a full system replacement. A well-maintained tankless unit in a North Vancouver home can deliver reliable hot water for close to two decades before replacement becomes the better financial path.
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