First, I would like to thank Mr. Nishioka for sharing his concerns about anodes in Hot Water Tanks. Ths posting is on behalf of his concern and will hopefully give some insight about anodes in hot water tanks. An electrode can either be a cathode or anode. If the electrode is negatively charged than it is anode, and a cathode is positively charged.
Unlike DC current, which is one directional, AC alternate back and forth about 60 cycles per second. For example, a light using AC is literally flickering on and off, but at such short periods that eyes do not pick it up. Both a anode and cathode is AC current are more of an electrode than a true anode or true cathode. I realize this might be confusing, but basically the anode in a hot water tank is suseptible to erosion.
The effects of heat on electrodes is an issue that all owners should be aware of. The electrode will break down. I have attached a link to popular mechanics that will help us understand how to change a hot water anode. http://www.popularmechanics.com/home/improvement/electrical-plumbing/4206690
Another great article written by a plumbing company discusses the corrosion process and replacement DYI.
Enjoy,
James
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