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How does water hardness affect it? Mine is on the harder end, I've been wondering if that is giving me trouble.

Hard water will boil at a higher temperature, but it's only a degree or two.

Plus, pasta start cooking at 80 ºC. No need to keep the water boiling like crazy :)

Boiling like crazy or not, it's still just 100C if it's boiling at all isn't it?

I guess at a really low boil there could be cooler parts of the water.