Yeah in the US there’s not a convenient way to turn your boiler down or off, nor would you want to because that’s not really how they were designed. But I don’t think that was the same in all countries-- I remember reading a book from a British guy who moved to the US and couldn’t figure out how to turn his heater off before realizing he wasn’t supposed to.

Plus now with the newer “tankless” models you don’t have to keep water hot all day, just turn it on when you need it.