343 sats \ 0 replies \ @BTCMiner OP 7 Nov 2022 \ parent \ on: Bitmain launches S19 Pro Hyd miner, 177T 5221W 29.5 J/T $21/T, Feb 2023 delivery bitcoin
Recommended, but not a requirement.
Here's a write-up from Compass on a prior Hyd model:
What to know about the Bitmain S19 Hydro
https://compassmining.io/education/what-to-know-about-the-bitmain-s19-hydro/