When to replace the water cylinder's sacrificial anode

The sacrificial anode is one of the least known parts of a water cylinder, yet one of the most important for its durability. Its job is simple, to corrode itself before the metal tank starts corroding, thereby protecting the appliance's entire internal structure.

There is no single replacement interval for every appliance. Follow the manufacturer's manual, as wear varies with the model, water characteristics and intensity of use.

A few signs indicate that the anode is already worn and needs attention: water with a smell similar to rotten eggs (a sign of a chemical reaction in the tank), water with a slightly yellowish or brownish tint, and boiling noises coming from inside the cylinder, associated with sediment build-up.

Ignoring anode replacement once it's worn significantly speeds up tank corrosion, which can lead to leaks and the need to replace the whole appliance, a far higher cost than simply replacing the part.

If the maintenance history is unknown or you notice unusual water, noise, corrosion or leakage, request a technical inspection.