HI, I'm in the middle of brewing an American Honey Pale Ale. I have two 2.4kW kettle elements in my lagged 50L SS boiler but only use one when the boil is reached. The boil is on... and then some. The wort is nearly climbing out of the pot and I'm thinking it would be useful to be able to regulate the element, i.e. turn it down a bit. I'm guessing the electrics are pretty basic but I could do with a steer as to what such a regulator might be called or how I might go about building one. A potentiometer? Does this work for AC too? My DIY is good but I'm no electrician. Anyone? Thanks.