Yeah, but not for countertop appliances. Those are all 110/120VAC. Even things as large as a consumer level refrigerator or freezer are almost always 110/120VAC too.

While I have a kettle for water, there are two issues with them for tea.

1. The water gets stale and the reheating drives off the all the excess air that fresh water has. This loss of dissolved oxygen kills the flavor of your tea and makes it taste bad. You should always use fresh water to make your or even coffee.
2. A cheap kettle is, well cheap. You can't make a good cup of green or oolong tea if you pour boiling water on it. Those need to be brewed at a lower temperature. And guessing doesn't work. And a temperature adjustable kettle will set you back anywhere from $50US to $100US.