I've read this thread fully and am keen to make a controller, but i saw this on e-bay
http://www.ebay.com.au/itm/251364375914?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649
It say's it'll do 4000w at 240v with a resistive load (apparently an element is one)
Its sooo cheap, will it...