A water heater/dispenser, you can find some smaller capacity ones for under 100.
I have one that was more than 100 but it's because I love it so much that I wanted a 5 liter one.
I can make tea in an instant and always have plenty of near boiling water. They're extremely power efficient so they don't cost much too run.
I make a liter of tea at a time sometimes 1.5 liters if I'm making a cup for now and a thermos for work.
While you are waiting your minute to boil, I have already filled both of my cups and am steeping.
Yeah, I'm an American tea drinker, always have used an electric kettle. It still just takes a couple minutes or something, nothing major. I think it's just fewer tea drinkers, maybe.
I'm not saying a microwave is better or not to get an electric kettle. I'm just saying folks never seem to even consider a microwave. In the US it is more likely that a microwave is present than an electric kettle and it is much easier to use than a stove top kettle (unless maybe you have an induction stove).
I think another part of it is that in the US hot tea is often seen as a more quaint sort of ritualistic thing than hot coffee is. Yeah, some folks like to do fancy pour over coffee but it's rare. I think stove top kettles just feel more whimsical than a microwave. I think many US hot tea drinkers would view someone saying "why don't you use a microwave" the same way an audiophile listening to vinyl might react to someone asking why don't they just use Bluetooth with Spotify. That's all fine and good, I don't see a problem with it, but even apart from those folks people just never seem to even realize they can use a microwave to heat water.
I got a Breville kettle that only boils a cup worth at a time. Game changer, meant I could brew up between games of COD back when I played it. I've never gone back to a regular kettle.