That is an option.
In my drawing, the MLT wouldn't need a heat source. Heat in the BK, and store in the HLT. That may not be viable, but is the thought process for the moment. Heat water in the BK-send to MT, Recirq RIMS, Heat water in BK and send to HLT to hold for sparge. Three kettles, one Burner, one RIMS heater.
Thoughts?
You would need a really well insulated HLT. I would personally forego the expensive tubing and get a burner for my HLT. Doesn't even need to be more than a turkey fryer at all.
This is exactly my system. Two-tier. One pump and a manifold. Big burner for BK, cheapo burner on HLT, electric RIMS on mash with Cheap Auberins PID. Immersion chiller. With centrally located manifold outlets and long enough hoses with quick-disconnects, I can pump from any kettle to any other kettle if needed. (or for clean-up time)
so far, so good!
You could upsize something like my rig...
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