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They’re readily available, but most households don't actually have one. Many more households have a coffee maker, which is essentially the same thing but specialized for dripping the boiling water through coffee grounds. Anyone else who needs boiling water just puts a pot on the stove, or possibly an old–fashioned metal tea kettle.

We could even use 240v electric tea kettles here in the US if we wanted to; most kitchens with an electric range and oven have 240v (or 208v) outlets to plug them in to. But those outlets are usually inconveniently located for counter–top appliances. It wouldn’t cost much to add another above the counter, but it is rarely done in practice. Of course, in many parts of the US natural gas heating is cheaper than electric so the houses there are built for gas ranges and ovens instead.