Swapping out an aging gas tankless water heater in New Westminster generally runs $3,500 to $7,500, depending on whether the old venting and gas line can be reused.
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Quick answer
Replacing a gas tankless water heater with a new unit in New Westminster typically costs $3,500 to $7,500. That's a ballpark drawn from 2026 public market data, not a quote — the CANRO office has a certified gas technician confirm your price after seeing whether the existing venting, gas line, and mounting location can be reused or need updating.
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 generally have a longer service life than storage tanks, but they don't last forever. The clearest signal it's time to replace rather than keep repairing is a pattern: repeated unrelated failures, a heat exchanger fault on an older unit, or a repair estimate that starts approaching a meaningful fraction of what a new unit would cost. A single failed component on a unit under ten years old is almost always worth fixing instead — replacement becomes the more sensible call as failures stack up or as parts for an older or discontinued model get harder to source.
| Situation | Typically Better Direction |
|---|---|
| Single fault, unit under 10 years old | Repair |
| Heat exchanger failure on an older unit | Often replace |
| Repeated unrelated failures over short period | Replace |
| Parts no longer available for the model | Replace |
A straightforward like-for-like swap — replacing a tankless unit with another of similar capacity in the same spot — is usually the lowest-cost path, since the existing venting and gas line often just need a fresh inspection rather than replacement. That's common in newer construction near the Quay and along the SkyTrain corridor, where mechanical rooms were built with tankless units already in mind.
Older installs are a different story. In Queens Park and Glenbrooke North character homes, a tankless unit installed a decade or more ago may have been set up before current venting clearance rules were tightened, which means a replacement sometimes triggers venting work to bring the install up to code even though the household just wants a straightforward swap. It's not a sign of doing anything wrong originally — codes and best practices evolve, and a replacement is a natural point to catch up to them.
Households in Queensborough replacing an older unit sometimes find the ground-level moisture that affected an old storage tank isn't a factor with tankless, since there's no tank sitting low to the floor to corrode — one practical reason some homeowners there choose to stick with tankless when the time comes to replace.
Replacement is also the natural moment to reconsider capacity — if the original unit has always struggled to keep up with simultaneous showers or a laneway suite's added demand, sizing up during replacement avoids paying for a second install down the road. A technician can walk through your household's actual usage pattern rather than just matching the old unit's rating by default.
Safety note
Replacing a gas tankless water heater involves gas line and venting work that must be performed by a Technical Safety BC licensed gas fitter — CANRO holds gas licence LGA0043870. If you smell gas at any point, leave the home and call FortisBC at 1-800-663-9911 from outside.
Tankless units generally outlast storage tanks with proper maintenance, though actual lifespan varies by usage, water quality, and how consistently the unit was descaled. A technician can assess your specific unit's condition rather than relying on age alone.
Yes, and replacement is often the best time to do it, especially if your household's hot water demand has grown since the original install. This may require gas line or venting adjustments depending on the new unit's rating.
Sometimes, but not always — venting requirements can change between models and over time as codes are updated. A technician checks this before confirming your replacement price.
Generally yes, due to the venting and gas line requirements specific to tankless units, though the comparison also depends on your existing setup and what needs updating.
Your technician removes and disposes of the old unit as part of the replacement job, so you don't need to arrange that separately.
Yes, gas connection work for a replacement typically requires a permit through the City, and the job is inspected before it's signed off.
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