[Stevie]

You wouldn't need dial thermometers in your HLT or Mashtun in this unless you want them.

[turfgrass]

correct.  there will be a heating element in the HLT and prob sensor that controls the MT and HLT.  Also a element in the BK with a sensor, so no real need for any dials.

[turfgrass]

I've been wondering if I should increase the MT from 10 to 15 gallons.  I don't see myself upgrading for a long time with SB custom kettles.   Would two 10s and a 15gal kettle off balance the system?  Just don't want to limit batch size.

[Stevie]

All depends on your needs. IMO, with HERMS, an HLT that can hold your entire water volume is important. 10 gallon batches I'd go with 20/15/15, 5 gallon I'd go 15/10/10.

[turfgrass]

Good point.  The Herms control box that I'm building will only power one heating element at a time.   However, I'm doing 10 gal kettles for 5 gal batches and need less than four gallons of sparse/boil water.