Okay, i (biodiesel guy) need to lean on the expertise of you home brewer guys. Our guys don't even know about PID yet! I have a 200 gal conical tank that circulates bottom to top. It has a 1/2hp pump and flows through an external steel box that contains a 5500 watt heater. I also use a 55gal drum that circulates oil through a 5500 watt heater fed by a 1/2hp heater into a small centrifuge. I bought 2 Sestos temp controllers and 2 Sestos dual timers. My goal for these pids is to control temps and use the timers as a simple on/off for the pumps and shut everything down after two hours of mixing in the 200 gal tank. In the 55 gal centrifuge tank after 6 hours. Is this possible? Like i said, you guys are light years ahead of us and i want to be among the first to do it!