Not much we can do about that, I’m afraid. Most residential outlets are 15 amps, and to double them to 30 amps or convert them to 240V would require costly rewiring. And copper prices are sky-high these days.
But that's kinda academic if nobody sells kettles that have the North American 240V plug.
You'd need an extra conductor of wire than is there in the cable for a standard 240V outlet. (Hot1, Hot2, Neutral, Gnd).
You can run a Hot1/Hot2 240V circuit with existing 14/2 romex, but odds are that whatever feeds the outlet in your kitchen also feeds many other outlets, and you don't want them all to be 240V.
Note North America doesn't use ring circuits like the UK.
Similarly, even with good insulation, a combi boiler is more efficient than having a hot water tank.
whatever happened to the guy, i was a fan of his videos then he stopped posting a few years back...
electroboom seems to be covering a similar niche, so that's good though.