I’ve been shopping around a bit for an immersion chiller and most 3/8’ x 25’ models run from around $60 and up. My LHBS has a 3/8" by 20’ for $42. I brew three gallon batches and was thinking that the 20 footer would do the job. Yes? No?
IMHO, it helps if the height of the IC coil is at least as high as is the depth of the wort in your kettle.
That would be no problem, a gentle pressure would spread the coils a bit apart to match the depth of my three gallon batches.
I would imagine that 20’ would be plenty.