Some comments from my current project that may be helpful. I am in the process of adding a 240V/10G BoilCoil to my 10G stainless kettle along with a custom-made 1/2"x25' stainless HERMS coil. All the input above is why I chose to go with 240V over 120V. I brew infrequently enough that I will simply be using a hefty extension cord from my Dryer outlet. The bigger challenge I have encountered is automated on/off control of the BoilCoil. Blichmann plans to release an Electric Tower of Power Controller soon but have not yet (as of September 15th, 2014). I have read the Electric Brewery website's controller design write-up three times and costed out designing and building my own. The cost varies dramatically dependent upon what parts you may have available and what parts you choose to purchase. It could easily cost $600-800 depending on these factors and also requires some electrical knowledge or time to invest in learning. Therefore, I am waiting for the electric Tower of Power to be released so I can review its features, functionality, and cost compared to building my own. I noticed early in this thread Bowers mentioned a Johnson Controller. Temperature controllers such as the A419 do not provide the accuracy I desire for my HLT. The bigger problem with them however, is that they don't provide nearly enough resistive load handling for something like a 240V BoilCoil. You really have to utilize components that can handle 240V/20+ amps including a PID controller, Solid State Relay (SSR), heat sink, and a host of other stuff.... hence the steep price I mentioned earlier. Anyhow… just my 2 cents. Hopefully I can post some pictures and further info that may be useful to you after I complete my HLT!