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Letme isn't stupid, I think the poster just used or heard the wrong word. Heater have an anode , a stink rod, a sacrificial rod which protects the tank's lining from your LV water.
The only other thing that I can think of where the poster would have used the word "diode" is that some of the anti-explosion water heaters have a safty cut off built into the thermocouple line that is in the heating chamber and if the flames starts to roll and over heats the heating area it will snap the protector off. This requires that the thermocouple be replaced and the problem that caused the overheating to be repaired.
Water contains ions (Say sodium and clorine from salt) for instance.
When yiou combine ions with dissimilar metals you get a battery. When you get a battery, you have corrosion.
An example is salt used on the roads in the winter time combined with water create rust if not washed off.
You can take a lemon and insert two disimilar metals in it and come up with a voltage or a small battery.
There are all sorts of disimilar metals in a water system, for instance solder and copper. This has the potential of creating a small battery.
By carefully selecting the material, usually magnesium, you can "tell" a system to preferentially corrode this. It's kind of like the path of least resistance.
The anode is just a hunk of magnesium, sometimes other metals, that hangs in your tank. This rod corroods first, thus preventing holes in other parts of your water system. The ions are used up in the conversion.
Chlorine ions might be sucked up by the magnesium to form Magnesium Chloride instead of, for instance, copper chloride thi preventing damage to copper plumbing.
Short answer, something has to corrode and the anode is there to be the first and only thing to corrode rather than the tank. The anode is cheap and easy to replace so we call it sacrificial.
Water contains ions (Say sodium and clorine from salt) for instance.
When yiou combine ions with dissimilar metals you get a battery. When you get a battery, you have corrosion.
An example is salt used on the roads in the winter time combined with water create rust if not washed off.
You can take a lemon and insert two disimilar metals in it and come up with a voltage or a small battery.
There are all sorts of disimilar metals in a water system, for instance solder and copper. This has the potential of creating a small battery.
By carefully selecting the material, usually magnesium, you can "tell" a system to preferentially corrode this. It's kind of like the path of least resistance.
The anode is just a hunk of magnesium, sometimes other metals, that hangs in your tank. This rod corroods first, thus preventing holes in other parts of your water system. The ions are used up in the conversion.
Chlorine ions might be sucked up by the magnesium to form Magnesium Chloride instead of, for instance, copper chloride thi preventing damage to copper plumbing.
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