The question is in regard to residential and possibly light commercial. I’m new to the game, and just trying to figure out some of the things I’m unsure of. If you have an 8 GPM machine and your supply is providing 7 GPM, you’re only working at a 1 GPM deficit, so it would seem pointless to have a 200 gal buffer tank since that would allow over 3 hours of trigger time before you ran out of water. If your supply was only providing 4 GPM that same 200 gal tank would allow 50 min of trigger time.
I’m guessing you have to know what your typical supply GPM is, and how much consecutive trigger time you need? Or is there more to it than that?