I don't think they're that uncommon in the US. They're not ubiquitous like they are in Europe but I feel like the majority of people have them. As mentioned, it's probably more to do with whether you drink tea than anything else, and not as many people drink tea all the time here. Come to think of it, I've never seen anyone boil water for tea on the stove in the last decade. They either use a kettle or they don't drink tea at all.