The geyser anode rod: the part that stops your tank rusting
The anode rod, often just called the geyser rod, is a metal rod (usually magnesium or aluminium) screwed into the top of the tank. It corrodes on purpose so that the steel tank does not. When it is used up, the tank starts to rust, and leaks soon follow.
How it works
In water, the more reactive metal corrodes first. The anode rod is more reactive than the tank steel, so it is slowly eaten away while protecting the tank. It is a consumable part, like a battery for tank protection.
Why it wears faster in parts of Pakistan
Hard, mineral-rich or salty water, common in many areas including parts of Karachi and areas on boring water, speeds up corrosion. Rods in these areas may be used up in a couple of years.
Signs it needs replacing
- Rusty or discoloured hot water.
- A rotten-egg smell from hot water.
- The geyser is several years old and the rod has never been checked.
- On inspection, the rod is thin, pitted or the core wire is exposed.
Replacing it
Turn off gas and water, release pressure, drain some water, then unscrew the rod from the top of the tank. Rooftop geysers may need space above the tank to pull it out. It is a routine job for a plumber during a pre-winter service, and far cheaper than a new geyser.
Frequently asked questions
How often should I change the geyser rod?
Check it every one to two years and replace it when it is heavily worn; sooner with hard or salty water.
Does the electric element count as the geyser rod?
No. People sometimes call the electric heating element a rod, but the anode rod is a separate part that protects the tank.
Get the price, photos and details for your city
Tell us your city, geyser type and WhatsApp number. We send the price, photos and ordering details for your city, usually within one working day.