A torn or badly clogged inlet filter is usually replaced outright, and access to the unit and general labour time are what actually shape the cost.
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Quick answer
A tankless water heater's inlet water filter gets replaced, rather than just cleaned, once the mesh screen is torn, warped, or so heavily scaled that cleaning no longer restores flow. The part itself is inexpensive, so the real cost driver is labour: how the unit is mounted, whether the isolation valves shut off cleanly, and how much time a technician needs to isolate, open, and reseal the housing without introducing a leak. A licensed technician gives a firm number after seeing the installation; no fixed price applies to every home.
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None of the approved whole-system cost ranges apply to a filter swap. A full tankless installation ballparks at roughly $3,500 to $7,500, which is a much larger scope than replacing this one component. Ask your technician for a firm number once they have inspected the unit.
Metro Vancouver's municipal supply is comparatively soft, so sediment on these filters tends to be more about pipe debris and installation-stage particulate than heavy mineral scale, while homes on Fraser Valley well water can see denser buildup. Units mounted on an exterior wall in a garage or laneway suite deserve extra attention during colder snaps, since a technician working on the inlet fitting will also check that nearby piping is adequately protected from freeze risk before closing up the job.
Safety note
This work involves isolating and opening part of a gas-fired appliance's water connections and should be done by a licensed technician. If you ever smell gas near the water heater, leave the home immediately and call FortisBC at 1-800-663-9911 before doing anything else.
Often yes, and a technician will try cleaning first; replacement is recommended only when the screen is damaged or cleaning no longer restores proper flow.
On an accessible unit with working isolation valves it is typically a short, same-visit job of well under an hour.
If the restriction was isolated to the unit's inlet, yes; if low flow is coming from elsewhere in the home's plumbing, the filter alone will not resolve it.
No, only the unit's own isolation valves need to be closed, so the rest of the home's plumbing is unaffected.
Since the isolation valves are already being used, many homeowners bundle a filter swap with a descaling flush during the same visit.
Debris that gets past a torn filter can accelerate wear on the flow sensor and heat exchanger further inside the unit, so it is worth addressing promptly.
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