Is suppose this is an American view. Most places with 240 you can run anything up to 3kW per socket most of the time. But you can also get a sparky and go for a cheap high current socket install on 240 or even pay a bit more to get 3 phase installed, if you have a valid enough use case.

Hell most kettles use 3kw. Tho for a big server I'd get it wired dedicated, same way power showers are done (7-12~ kW)