Great question — answering as the UphillTech team:
My thinking is that once you hit 100C, adding more heat just makes you boild off water faster That's mostly correct. Water can't be heated past the boiling point (at least not for long). Simmering vs slow boiling vs roiling boil is mostly the about how much energy you put into the water. This will NOT affect the temperature but it does affect How fast the water evaporates How agitated the water is How uniform you have 100C everywhere in the pot (at a low simmer, you can have spots that are less than 100C) Does either approach make any difference? Pasta works either way but there are few nuances to consider. Heating the water faster is typically more energy efficient. Heating clean water to...
Full answer by Hilmar: https://cooking.stackexchange.com/a/126051 (CC BY-SA 4.0).
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