If this switched from nuclear reactors to electric tea kettles for the household and the difference in power levels, then it seems simple. With 115V and a 15A circuit, which is the most common circuit in US homes, you get a maximum of 1725W or 1.725KW.
On the other hand, if you have 230V with 10A circuits, then the max power you can get is 2300W or 2.3KW. I have not visited Europe and could be wrong, but it is my impression that 230V, 10A circuits are fairly common there.
In both cases the tea kettle designers go for less than the max and you are left with 1.5KW and 2.0KW respectively. Frankly, I have a couple of electric coffee brewing devices and at least one that I use for iced tea and none of them even comes close to that power level. It just takes a bit longer to brew with them: the water gets just as hot.
About time for a cup of coffee now.
This weakness of using 115V, 15A circuits is why I installed 115V, 20A circuits when I wired my garage/shop. They are perfectly legal here, you just must use a larger gauge of wire and sockets rated for 20A instead of those for just 15A. Of course the electrical contractors prefer using cheaper wire and outlets and that explains the predominance of the 15A circuits here and probably of 10A circuits in Europe.
I have yet to run out of power in any corner of my shop, even when I connect multiple devices to one circuit. And for the heavier tools and shop AC I have 230V, 20A circuits.