When a SENSEI RU series unit in a Tsawwassen home is past reasonable repair, the replacement process is mostly about venting, gas sizing, and condensate drainage rather than the unit itself.
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Quick answer
A Rinnai SENSEI RU series unit is usually worth replacing rather than repairing once the heat exchanger itself has failed, once the unit is old enough that a major part failure would cost close to a new install, or once recurring faults keep coming back after repeated service visits. In Tsawwassen, replacement typically also means re-checking the existing vent run and condensate drain against current code before the new unit goes in.
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A condensing tankless unit doesn't usually fail all at once; it tends to send signals first. Repeated lockouts that return within weeks of a repair, a heat exchanger leak, or scale-related efficiency loss that persists even after descaling are the clearest indicators. On the peninsula, we also see units that were installed close to two decades ago starting to show cumulative corrosion on internal components from long-term condensate exposure, which is a normal end-of-life pattern for this equipment category rather than a defect.
Tsawwassen's older subdivisions, many built from the 1960s through the 1980s, often have the water heater tucked into a garage or a small mechanical closet with limited combustion air. When we replace a SENSEI RU unit in one of these homes, the first job isn't unboxing the new unit, it's confirming the existing vent termination, gas line sizing, and condensate routing still meet current code, because code has moved since some of these original installs went in. Corporation of Delta issues the mechanical permit for this work, and a licensed contractor pulls it before the swap. Newer construction in Tsawwassen, including infill and subdivision homes built in the last decade, usually has more generous mechanical space and a more direct vent run, which keeps the replacement more straightforward, though condensate drain routing still needs a fresh look on any unit that's been in place ten-plus years.
| Situation | Usually repair | Usually replace |
|---|---|---|
| Filter, sensor, or igniter fault on a unit under 8-10 years old | Yes | |
| Heat exchanger leak or failure | Yes | |
| Repeated lockouts after multiple repair visits | Yes | |
| Unit approaching or past typical end-of-service-life age | Yes |
Tankless install, including a straightforward swap where venting and gas sizing don't need major rework, runs in the $3,500–$7,500 range as a 2026 public-market ballpark, not a quote. Jobs that require re-routing the vent termination, upsizing the gas line, or relocating the condensate drain to meet current code sit toward the upper end of that range, and CANRO's certified technicians will confirm the actual number after assessing your specific mechanical room.
Safety note
If you ever smell gas, hear a hissing sound near the water heater, or notice sooting, a burning smell, or a yellow flickering flame instead of a steady blue one, leave the house right away and call FortisBC's emergency line at 1-800-663-9911 from outside. Do not try to relight the unit, flip breakers, or investigate the smell yourself; let a Technical Safety BC licensed gas fitter make the call safe.
Sometimes, if it's the correct material, diameter, and still within allowable length and termination clearance for the new unit. A technician checks this before quoting.
Yes, gas water heater replacement requires a mechanical permit through the Corporation of Delta regardless of whether the new unit is the same model line.
Usually yes, since tankless units in the same product family are similarly sized, though your technician will confirm clearances and combustion air are still adequate.
It's disconnected, removed from the property, and recycled or disposed of responsibly as part of the job.
That depends on scheduling and permit turnaround; CANRO doesn't promise a specific turnaround time, but the office can give you a realistic window once the permit is submitted.
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