Anodes for Corrosion Prevention

Central Heating Points
April 28, 2014
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An age old problem is the formation of rust. This occurs when metals and water are together for an extended time period. It is actually the result of a reaction between oxygen, water and metal. Of course plumbing is all about the relationship between water and metal and none more so than the tanks and cylinders that store water for our use. There needs to be a way of either stopping rust or at least slowing the process by which it occurs. The best way to combat this reaction is to fit something called an anode. This is formed into the shape of a rod and is usually manufactured from Magnesium. This is because water will corrode all metals eventually but Magnesium will corrode sooner, thus saving the water tank or cylinder’s integrity. This is fitted inside the water cylinder. When the anode is in bad condition the tank damage will be greatly reduced. The condition however cannot be seen externally. Therefore the tank or cylinder has to be isolated and drained.


Remove and Replace:

Isolate the power and the cold water inlet to the heater. Undo the hexagonal bolt that secures the rod in place, then take out what remains of the sacrificial anode rod. Fit the new one in its place. A Willesden Plumber can replace this. Fit the new piece in the reverse order. Be sure to use Teflon tape on the threaded fitting to prevent it leaking. Turn the water and power to the water heater back on.

Approximately twice a year visually inspect the anode for deterioration, this will gauge how long the anode will last. It is a good idea to include its inspection in your maintenance schedule accordingly. Willesden Plumbers know about anodes. These anodes are available in different shapes and sizes, so you need to have the details of your whole system to make sure that you get the correct one. This information should be on a label on the water-heater.


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