[Groxx]

I loved having one of these until the non-stick coating inside started flaking off badly after a couple years.

Nowadays I'm only touching steel and/or glass on these things. An all-steel-interior Zwilling kettle has lasted me twice as long already, and looks brand new (on the inside) if I give it a brief acid cleanse to remove deposits. It's not quite as convenient or as stable temperature, but I'm more than happy to have something that lasts many times longer.

[nine_k]

Two-layer, thermopot-style kettles are a thing; I own one. All-steel interior is a natural consequence.

[Groxx]

What brand? I couldn't find any last time I looked, and I do generally prefer the dispenser style (slower to hit a temp, but rock solid once there, and basically always ready to go. surprisingly useful / habit-altering).