From what I understood after reading the instruction manual, this unit is esentially a manual mode PID on steroids. This unit cycles the PID several times a second (burst mode) rather than the traditional 2 second (or greater) cycles. This allows you to use the same SSR you would use with a traditional PID rather than getting a SSVR. A pot uses a SSVR to regulate power output but the output isn't linear and a digital display looks cooler
I am planning on wiring it by having a two way switch with two NO and two NC contacts so that the SSR is only connected to either the PID or the digital boiler. Ill draw up a diagram and attach pictures when I get it set up.
I currently use a single vessel, recirculating e-BIAB and Ill throw some of those pictures in too.
I just placed the order today so stay tuned