They're exaggerating. But your typical North American electric kettle is—ballpark—twice as slow as a European kettle.
Your standard North American sockets provide half the voltage but not double the amperage, so they're half as powerful.
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.
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.
It's great for boiling water for cooking; at 230V it's faster than heating on the hob. But if it took 7–8 minutes, that'd be frustrating.
I typically don’t even keep track of how long it takes to boil on the stove. I just do the rest of the prep work.
A power boil option would be a decent alternative.
I'm probably just impatient, to be fair.