[tguvot]

https://en.wikipedia.org/wiki/Circulator_pump#Use_with_domes...

[Gigachad]

This seems like something that only makes sense when water is scarce but electricity is cheap. You’d be constantly losing heat to the poorly insulated pipes.

[tguvot]

I have all hot water pipes insulated in my house

[Scoundreller]

And you're fully losing heat if you dump lukewarm water down the drain (instead of cycling it back to the heater) to eventually get hot water.

[maxerickson]

People who do it more or less don't care about the price of energy (except maybe in the abstract).

It's for comfort and convenience.