A louder or grinding fan on a Tsawwassen tankless unit is worth a look, especially given the extra wear coastal air and blown debris can add over the years.
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Quick answer
A tankless water heater's combustion fan getting louder over time in Tsawwassen is most commonly due to worn bearings from age and normal use, debris pulled into the intake from coastal wind, or a mounting bracket that has loosened. Because the fan directly affects combustion air and exhaust flow, a technician checks airflow and mounting condition together with the sound itself rather than assuming it is purely cosmetic noise.
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The combustion fan draws in air for the burner and expels exhaust through the sealed venting system, running at variable speed depending on how hard the unit is firing. A healthy fan produces a steady, moderate hum; as it ages or picks up debris, that sound can shift into a whine, grind, or intermittent rattle.
Tsawwassen's exposure to wind off the Strait of Georgia means exterior-mounted units and intake terminations see more airborne debris over time than a sheltered inland install would, from sand and grit near the beach to general yard debris carried by consistent coastal wind. That debris can work its way into an intake and settle in the fan housing, producing a distinct ticking or rattling noise.
Salt-laden air can also accelerate corrosion on metal fan components and mounting hardware over many years of exposure, particularly on units installed on an exterior wall facing the water, which is worth mentioning to your technician if your unit has been in place a long time near the waterfront.
| Noise pattern | Likely cause |
|---|---|
| Gradual increase over a year or more | Bearing wear from age and use |
| Rattling, intermittent, tied to wind or recent weather | Debris in the intake or fan housing |
| Vibration through the wall, older exterior unit | Loosened or corroded mounting hardware |
| Grinding, worsening quickly | Advancing bearing failure needing prompt attention |
Clearing debris and tightening or replacing corroded mounting hardware are contained, affordable fixes. A worn fan bearing typically means replacing the combustion fan assembly, a moderate repair that restores normal, quiet operation on an otherwise healthy unit.
For units that have spent many years directly exposed to salt air with visible corrosion beyond just the fan, it is worth having the technician assess overall cabinet and component condition at the same visit, since coastal exposure can shorten a unit's practical service life compared with a sheltered inland install.
Safety note
If you ever smell gas (a sulphur or rotten-egg odour) near the tankless unit, hear hissing at a fitting, or the unit's exhaust is spilling into the mechanical room instead of venting outside, leave the home and call FortisBC's emergency line at 1-800-663-9911 from a safe distance before doing anything else. Do not try to relight the unit, reset the breaker, or open the cabinet yourself. Combustion and venting faults on a gas appliance are a Technical Safety BC licensed gas fitter's job, not a DIY project, because they involve flammable gas and carbon monoxide risk.
Over many years of direct exposure, yes, salt-laden coastal air can accelerate corrosion on exterior metal components including fan hardware and mounting brackets, particularly on units installed facing the water without much shelter.
A grinding sound that is actively worsening is worth scheduling service for sooner rather than later, since it usually indicates advancing bearing wear that can progress to fan failure.
Clearing visible debris from an accessible exterior screen is fine. Anything requiring opening the unit's cabinet should be left to a licensed technician.
Any cover or shield needs to be a product rated for use with combustion air intakes so it does not restrict airflow; a technician can advise on manufacturer-approved options for your specific installation.
An annual check that includes the intake, exhaust, and mounting hardware is a reasonable interval for a unit exposed to coastal wind and salt air, even if it is not showing obvious symptoms yet.
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