that’s not a waste of energy, but i bet there was also other habit that is: unless you want to specifically evaporate water, things will get boiled just the same on low or high heat. (heating up to boiling point is most economical using high power) there’s zero reason to keep thing boiling on high heat then add water. also, using hot tap water. water heater is much better at heating water than open gas flame, yet i see people insisting on heating entire pots and kettles of cold tap water
that’s not a waste of energy, but i bet there was also other habit that is: unless you want to specifically evaporate water, things will get boiled just the same on low or high heat. (heating up to boiling point is most economical using high power) there’s zero reason to keep thing boiling on high heat then add water. also, using hot tap water. water heater is much better at heating water than open gas flame, yet i see people insisting on heating entire pots and kettles of cold tap water
I’ve always heard not to drink hot tap water or cook with it because of the risk of nasty things leaching from the pipes. https://www.abc.net.au/news/2023-09-07/is-it-actually-bad-to-drink-warm-water-from-the-tap/102812252
Legionella specifically. If you’re going to drink hot from the tap, go all the way to boiling first