Growing motor noise or repeated airflow lockouts usually mean the blower motor is replaced outright, since bearing wear cannot be repaired in place.
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Quick answer
A power-vent water heater's blower motor is replaced once bearing wear, a seized shaft, or an electrical fault is confirmed, since these failures cannot be repaired in place. A fan wheel that is merely dirty may just need cleaning rather than full replacement, so diagnosis matters before ordering the part. Cost is driven mainly by the motor's accessibility on that specific model, whether the fan housing needs to come apart, and general labour time. A licensed technician gives a firm number after inspecting the unit.
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None of the approved whole-system cost ranges apply directly to this single part. Cost for a gas storage tank water heater depends on size, vent type, and access, and is quoted after a short assessment; a blower motor swap is a much smaller repair within that larger picture. Ask your technician for a firm number once they have inspected the unit.
Power-vent and direct-vent water heaters are common in Metro Vancouver condos and townhomes where a traditional vertical chimney is not practical, which means the blower motor sees continuous duty in a lot of these installations. Combustion air quality also plays a role: units installed in a garage or utility room with more airborne dust tend to see fan wheel fouling sooner, which is worth mentioning to a technician during a service visit.
Safety note
The blower motor is part of a natural gas water heater's safety-related venting system and should be replaced by a Technical Safety BC licensed gas fitter; CANRO holds gas licence LGA0043870 and boiler licence LBP0046450. 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.
If fouling on the fan wheel is the only issue, cleaning can resolve it; replacement is needed once the motor itself has worn bearings or an electrical fault.
On an accessible unit it is typically a same-visit job of one to a few hours, including disassembly, replacement, and a full test cycle.
Yes, briefly, since the unit needs to be powered down and partially disassembled to access the blower housing.
The blower motor is one of the few moving mechanical parts on these units, so it is a reasonably common wear item compared with the rest of the appliance.
Repeated resets without addressing the underlying airflow issue are not recommended, since the lockout is a safety response to inadequate venting.
Warranty terms are set by the manufacturer of the specific part, so it is worth confirming coverage details with your technician at the time of replacement.
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