I can't say I've ever seen one in the real world. Then again, I'm Southern. We're pretty prolific tea drinkers, too, but the tea only stays hot long enough for the half pound of sugar to dissolve, and is put on ice immediately afterward. Around here it's kind of weird to be into hot tea. Then again it's 87 degrees outside (and 84 inside due to a busted AC unit), and it's early march. That's 30.5 and 28.9 C, respectively.
One other thing -- we actually do have 240 volt outlets here in the US. It's just that they're reserved for big appliances like hot water heaters, clothes driers, and stoves. Everything else runs on 120 volts, 60 htz, but we have extra oomph available for the stuff that needs it. Just typically not more than two or three outlets in any given house wired that way. Not enough for a 240 volt tea kettle, unless you /really/ like tea, I guess.
Edit: Early April, rather. It was pretty danged hot in March, too, though. We haven't had a real winter even by Florida standards in three or four years now.