I'm currently brewing on a 25g rig that belongs to the company I work for. I went from 5g all-grain in a cooler to this system. I'll try to supply a pic later, but here's the basics of my set up:
All kettles are 25g stainless
All kettles are direct fire propane
HLT has a temp-controller, the rest have valves to control burner output
HLT and Boil Kettle have outlets 1/2" from bottom of kettle
Mash Tun has same, but also an inlet near top
There are two temp controllers. One for HLT, the other operates the outlet for the pump.
Up to now, I've been mainly mashing in, monitoring temp, possibly heating mash tun and recirculating wort to add a degree or two. Efficiency has been good, beers have been good.
I just don't think I'm using the system the way it was meant to be used. Should I be circulating during the entire mash? Would I set the pump to come on just below mash temp? If so, am I pumping water from the HLT?
While I know this isn't a RIMS or HERMS set-up, it seems that it has some similarities. I'd appreciate any thoughts.