Here's some more shots of my TopTier electric HERMS in action. I love this thing! Two pumps, two utility shelves, three 15 gallons kettles, two 5500W elements. It all comes together nicely.
The photos are slightly out of order.
First photo is my fly sparging. You can see the sprinkler/sparge head right above the MLT (second tier) . HLT is the top kettle. BK is lowermost. Notice the stepstool to see into the HLT. See also the (gravity) tube going from the MLT (second) to the BK (third).
Second, Third, and Fourth photo is recirculating the mash prior to fly sparging. I'm making a Scottish 80. You can see the dark wort in the tubing. The boil ketttle (lowermost kettle) is unplugged and waiting. Control panel and Ranco temp controllers on the table to the right (facing the TopTier). 220V outlets are on the side of the house. You can see the manual thermometer in the MLT lid. So long as this thermometer is my mash temp, I know I'm good to go.
My Ranco monitors my HLT temp. There's a 1-2 degree difference between HLT and my mash temp. If i want to mash at 150, I set the Ranco in the HLT to 151 or 152. Bottom-most pump recirc's the water in the top HLT to maintain a steady temp in the HLT.
I pump the HLT liquor into the MLT, then gravity the MLT into the BK. BK for 90 mins, then pump into my therminator and into my fermenter. For my last batch next week, I'm making a double IPA using the new HopRocket (not shown). That'll be my last batch for the season.