Anode Rod Inspection Schedule

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What the anode rod does inside the tank

Steel tanks would corrode from the inside relatively quickly if left unprotected, so manufacturers install a sacrificial anode rod, typically magnesium or aluminum with a steel core wire, that corrodes preferentially instead of the tank itself. This is the same principle used on boat hulls and buried pipelines: the anode gives itself up so the more expensive, harder-to-replace component survives. Over years of operation the rod gradually dissolves, and once it is consumed the tank's steel lining becomes the next thing exposed to corrosive attack.

Because the rod's job is invisible and happens slowly, most homeowners never think about it until a tank fails years earlier than expected, which is often traceable back to a spent anode that was never replaced.

How Metro Vancouver's water affects the inspection schedule

• Metro Vancouver's municipal supply draws from mountain reservoirs and is comparatively soft, low in dissolved minerals, which is generally gentler on anode rods than harder water
• Homes on private wells in parts of the Fraser Valley often have harder or more mineral-rich water, which can consume an anode rod faster and warrants more frequent checks
• Water softeners, where installed, can accelerate anode consumption regardless of source water hardness, since softened water is more electrically conductive
• A rotten-egg odour from hot water taps can indicate a chemical reaction between certain anode materials and specific water chemistry, which sometimes calls for switching to a different anode material rather than skipping the rod altogether

What a licensed technician checks

1. Removes the anode rod, usually accessed through a hex head fitting on top of the tank, and inspects how much material remains along its length
2. Looks for exposed core wire, which indicates the rod is essentially spent and no longer offering meaningful protection
3. Assesses whether clearance above the tank allows a standard rod or requires a segmented or flexible rod for tight installations
4. Considers water chemistry and any reported odour issues when recommending magnesium, aluminum, or aluminum-zinc rod material
5. Documents rod condition so future inspections can track the consumption rate specific to that home's water

What a homeowner can safely observe

A persistent rotten-egg smell from hot water taps, hot water that looks rusty or discoloured, or a tank noticeably older than five to seven years that has never had the rod checked are all reasons to book an inspection. Removing the anode rod requires breaking a fitting that is often torqued very tight from the factory and working around a tank full of hot water, so this is not a practical do-it-yourself task for most households, and forcing the fitting without the right tools risks damaging the tank's threaded opening.

Keeping a simple record of when the tank was installed and when the rod was last checked makes future service visits faster and helps track how quickly the rod is being consumed in your specific home.

Typical inspection outcomes

Frequently asked questions