Water Heater Corrosion Signs Greater Vancouver

Internal corrosion is the leading cause of hot water tank failure in Greater Vancouver — recognizing the warning signs before the tank ruptures prevents water damage and an emergency replacement.

What This Means

Water heater tanks are steel lined with a glass coating and protected internally by the anode rod. When the anode depletes and the glass lining is imperfect, the steel tank begins to corrode from the inside. This is invisible until symptoms appear in the water or a leak develops.

Common Causes

• Rust-coloured hot water: iron from corroding tank walls entering the water supply — a late-stage sign
• Rust staining on exterior: especially at the bottom of the tank — suggests internal corrosion has reached the tank wall
• Rotten egg smell from hot water: depleted anode rod — an early warning that corrosion protection has failed
• Age: most tank failure from corrosion occurs after year 10 to 12 when the anode is long depleted

What Homeowners Can Check Safely

• Check the hot water at a white bathtub or sink — rust-coloured water is immediately visible
• Check the tank exterior for rust streaks, especially at the bottom, joints, and relief valve area

When to Call a Licensed Technician

Water heater work involves gas lines, high-voltage wiring, and pressurized plumbing. Always call a licensed gas fitter or plumber for repairs beyond basic visual checks.

• Anode rod inspection — confirm whether corrosion protection is still active
• Water sample analysis if rust colour is intermittent and cause is unclear
• Replacement planning and quote if the tank shows corrosion signs over 10 years old

Frequently Asked Questions

My hot water is slightly rust coloured. Is it definitely the water heater?

Not necessarily — rust in hot water can also come from old steel pipes in the home or a water main disturbance in the neighbourhood. Run cold water at the same tap: if cold is also rust-coloured, the source is upstream (pipes or main). If only the hot water is rust-coloured, the water heater is the likely source. On a tank over 10 years old showing rust-coloured water, replacement planning is appropriate.

I see rust staining on the outside of my water heater at the bottom. Does that mean it is leaking?

External rust staining at the bottom of the tank can come from condensation on the tank exterior or from a slow seep from a corroded bottom seam. Dry the tank exterior completely and check 24 hours later for new moisture. If moisture returns at the bottom of the tank body, the tank has a leak from the tank body — replacement is required. Internal corrosion that has reached the tank wall is not repairable.

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