re: Hot water from the tap, do you use it to cook?

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I had a science teacher in high school that said cold water would boil faster, no idea of the science behind this and I never tested it.

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I had a science teacher in high school that said cold water would boil faster,

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Your science teacher was an idiot.

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I had a science teacher in high school that said cold water would boil faster, no idea of the science behind this and I never tested it.

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This is not true. You have 120 deg water and 70 deg water, you add the same amount of heat, which one reaches 212 degs first?

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Cold water. I had a science teacher in high school that said cold water would boil faster, no idea of the science behind this and I never tested it.

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As did I until I grew up and learned about actual science.

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cold water would boil faster

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Physics tells us this is wrong, but many people persist in believing "alternate facts". Another is that previously-boiled water freezes faster. A popular belief is that water in altered physical states can have special health benefits. You can buy devices with the promise of generating such special water...save your money.

Ironically, physics or confusion about physics is behind some of these beliefs. Liquid water is a mix of molecular chains shifting among configurations in a small fraction of a second. Different mixtures can have slightly different properties. For unusual mixtures to persist requires highly modified experimental environments.

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I had a science teacher in high school that said cold water would boil faster, no idea of the science behind this and I never tested it.

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bullshite... What kind of science is that?

The hot water here is dam near boiling hot