Has anyone ever built a heatstick or electric boil kettle with a potentiometer controlling the amount of electricity? Something like a stove dial commonly used that controls how hot your electric range gets? I'm very curious about building an analog electric boil kettle. If anyone has ever done this or has any thoughts I would love to hear about them. This would be a 220-240V element in the range of 4500-5500W. I don't even know if they make potentiometers big enough for that kind of voltage that wouldn't cost an arm and a leg.