I'm thinking about my next upgrade. Currently brewing one five gallon batch at a time with 8.5 gallon SS mash tun and boil kettle. Recently started doing two batches on brew day due to timing temps of lagers in my two stage freezer fermentor chamber. In other words I want them to go D rest and chill to lager temps together. Anyway. ..
I've also heard the debate on sparge vs no sparge. It seems BIAB is resurrecting the idea that once upon a time our brewing ancestors did no sparge. Long story short I'm considering using my 8.5 pots for boil and adding another camp chef explorer dual burner, and two 14 gallon mash tuns. They would sit on a 16" platform behind my boilers. No lifting til its in fermentor
So for example, I would start with all the water in the tun. Heat to strike temp. Flame out. Stir in grain. Toss on my handy repurposed yoga mat insulator. Drain to the boil kettle, etc.
Cost is comfortable for me. I assume there will be an adjustment period as I learn efficiency of the system. If I have to up my grain bill a bit its no biggy. What I gain is less lifting, especially hot liquor. And the big gain is doing two at a time.
"Friends don't let friends drink bad beer"