Water Heater ANODE 2082mm MAGNESIUM Solar Hot Water LARGE NUT
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COULD YOUR HOT WATER TANK BE RUSTING AWAY RIGHT NOW?
An anode is made from a less noble metal than any other metal in the system. This is usually called a sacrificial anode so this corrodes instead of valuable equipment. Magnesium and aluminum are less noble than steel, which is why they are used for anode rods.
Water heater tanks are notorious for rusting out especially in certain water conditions. Once the tank rusts through, there is only one solution - replacement.
All water heaters leave the manufacturers already fitted with at least one sacrificial anode to protect against rusting. The sole purpose of the anode is to corrode away instead of the tank.
Checking the anode at least every 3-5 years or earlier depending on your water quality and replacing if necessary will add to the life of your water heater at a very small cost. Not to mention avoiding the inconvenience of having a new water heater installed, there is never a convenient time for this to happen.
What is a Sacrificial Anode? The anode is a metal rod usually magnesium, aluminum or zinc. The anode is usually screwed into the top of the tank or built into a special holder.
How does it work? Electrolysis eats away the metal anode instead of the metal of the tank. Once the anode is gone the electrolysis will then attack the tank and it will begin to corrode. If your water heater has an annual service agreement it is a good idea to ask your licensed plumber to check the anode during the service call. Magnesium is the most used metal for the manufacture of sacrificial anodes. It can be used in many applications, fresh water, chemically treated water, and direct earth burial are a few.