If you're thinking about doing an electric build, I highly recommend you visit The Electric Brewery. This is a fantastic resource where Kal shows you in-depth step-by-step details on how to create his electric brewery setup which is among the finest out there. HomeBrewTalk.com is another great source of information with a dedicated electric brewing forum. Many of the members there were a great help in putting together my setup.
Building an electric brewery setup isn't exactly cheap, but this instructable will show you how to build a basic combo hot liquor tank (HLT) & brew kettle (BK) setup as simply and inexpensively as possible--the entire setup can be assembled for around $300, a third of which is setting up the 240V supply outlet. The heating in this case is done with a 5500W hot water heater element powered by a 240V electic supply. This setup is also easily upgraded by adding a second kettle in the future.to have a dedicated HLT and BK.