Brewbeemer: I think 11,000 watts that will work great for you. My system started out as a 15 gallon system. My BK was a 25 gallon megapot. 9000 watts was more than enough for great mash temp control via the HERMS and more than enough power for the boil. I ran the PID at 65% once I reached the boil. It was all good until I found the 55 gallon SS drum...