Look around and find some of P_J's drawings. He has drawn a bunch of different system configurations. His stuff is excelent and he is a stand up kind of guy who will help you out if you have a question. Are you going to do RIMS or HERMS when you go all electric? My system is propane fired, so I would be zero help on that but setting up a basic controller is pretty easy as long as you approach the problem from a logical point of view. Good luck with your build and dont forget to post up some pics as you go. One of these days I will finish mine and post up the final set of pics. Got busy with some health issues and kind of put my whole life on the back burner for a while. But I am back and feeling much better, so I need to get busy and finish the tower.