Why is there a small piece of iron sponge in my electric water boiler?

Why is there a small piece of iron sponge in my electric water boiler? - Tools and bowl of water prepared for clay modeling

My electric water boiler has a small, yet dense bit of iron sponge, about the size of a Brussels sprout. I think it is something to prevent the water from superheating. However, I'm not sure that's the only reason, because they could also just make the inside of the boiler somewhat rougher, a solution that doesn't involve a loose element hanging around in the pot that can get lost. I think there's another reason for that loose element, but I'm not sure what that reason could be. Could there be another reason beyond superheating?



Best Answer

They are claimed (I don't know what research has actually been done) to prevent the build-up of limescale.




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What is inside an electric water heater?

Immersion heaters sit within the water radiating heat. Electricity heats these components which in turn heats the water. A circulating pump feeds the boiler and a tube allows the hot water to pass through to the necessary location needing the heat.

What device heats the water for the electric boiler?

Appliances that provide a continual supply of hot water are called water heaters, hot water heaters, hot water tanks, boilers, heat exchangers, geysers (Southern Africa only), or calorifiers.



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