I would like to add an analog control to by boil kettle element but i have never had to deal with potentiometers in my career before. How do i size a potentiometer and figure out what i need. I run on a 230v systerm and have a 2000w element that i would like to be able to turn down the power on incase of impending boil overs and to control the boil off rate a little better. Also i dont know if this is needed or not but im on a 50mhz cycle. Can anyone help?