Re: never seems to taste the same?
Which is quite enough for a kettle, unless you are trying to boil the water in roughly the time it takes to put water in the kettle.
My GF found a Teasmade at a local charity shop, labeled 'probably broken'. It wasn't, but the expectation that it would heat the water to a boil quite a bit faster than it actually did probably made them slap that label on.