Why they are two drains at HLT and BK, also there are two incomes for MLT?
I am building similar system but with one drain and one input per vessel.
The autosparge is redundant on a HERMS system. You want a continuous vorlauf, and simply throttle input rate to match output.
Because with HERMS
1.you'll be running a thinner mash naturally to account for the excess volume of the hoses, etc. (1.5-1.75 for me)
2. The continuous exchange of fluid is how you regulate temp in the mash tun.
I run mine pumping in as fast as it drains out. If I need to throttle back, I have one valve that controls everything, and I get 90-95% efficiency consistently.
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