Most burner problems on a tank water heater are solved with cleaning, but rust, corrosion, or a misshapen tray can push the job toward full replacement.
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Quick answer
A tank water heater's burner assembly is generally replaced, rather than cleaned, once the burner tray or orifice is rusted or corroded beyond a simple cleaning, or once the tank itself is old enough that a full water heater replacement is the more sensible comparison. What affects the cost for a specific home is access to the unit, whether venting or combustion air issues are contributing and need separate correction, and the age of the water heater overall. A licensed technician provides a firm number after inspecting the unit, and on an older tank will typically discuss whether a burner swap or a full replacement makes more sense.
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Individual burner replacement is a smaller, more contained job than a full water heater swap and does not fall under the approved ballparks for a tankless install, roughly $3,500 to $7,500, or boiler figures, since this is tank water heater work, not a boiler. Ask your technician for a firm number, and for an older tank, ask them to compare a burner-only repair against full water heater replacement so you can weigh both.
Water heaters installed in garages, crawl spaces, or unheated utility areas common in Metro Vancouver homes see more dust, lint, and occasional dampness reaching the combustion chamber than units in finished interior mechanical rooms, which can accelerate burner tray corrosion over time. If your water heater is installed on an exterior wall or in an area prone to dampness, it is worth asking your technician whether ventilation or moisture at the installation location is contributing to repeat burner issues.
Safety note
Burner assembly replacement takes place inside a gas-fired combustion chamber and must be performed by a licensed gas fitter. If you ever smell gas near the boiler or water heater, leave the home immediately and call FortisBC at 1-800-663-9911 before doing anything else.
It is a moderate, well-understood repair on most standard tank water heaters, generally completed in a single visit once the correct part is on hand.
If the tank is already old or showing other signs of wear, replacing the whole unit is often discussed as an alternative; your technician can lay out both options honestly for your situation.
Yes, for the duration of the repair, though on a straightforward job this is typically limited to a few hours.
Not necessarily, but rust often points to a moisture source, such as condensation or a nearby leak, that is worth identifying so it does not affect the tank itself over time.
Warranty terms are set by the manufacturer and vary by model and installation date, so check your specific certificate rather than assuming coverage either way.
Keeping the area around the water heater free of dust, lint, and stored items, and having it checked during annual maintenance, are the most practical ways to catch burner issues early.
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