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The limescale build up is mostly because there is Calcium Bicarbonate (Calcium Hydrogen Carbonate) dissolved in the water Ca(HCO3)2 this is quite soluble.When you heat it it decomposes Ca(HCO3)2(aq) → CaCO3(s) + H2O(l) + CO2(g)the CaCO3 is basically limestone and is not very soluble so it deposits where it is being formed - on the element. The solution is to dissolve it with an acid occasionally.
Actually, it is not the calcium carbonate that produces the odd taste, but the more soluble minerals that get attached to it. That is also why the limescale is most often brownish, rather than white like the cliffs of Dover.
Dave - I altered your chemical reaction slightly - there was a little mistake in it...
Sounds believable, but I've no real idea if it's true.