A lot of high power plasma processing equipment is water cooled. RF and DC generators, matches, etc. Stuff that requires a coax cable as thick as your arm.

A lot of high power plasma processing equipment is water cooled. RF and DC generators, matches, etc. Stuff that requires a coax cable as thick as your arm. The switch from air to water cooling happens around .5-1Kw, this is the same range they seem to be targeting for datacenter stuff. Aside from leaks, the building maintenance staff really needs to stay on top of the cooling water chemistry. Cooling loops tend to make slime and if you let it get out of control it clogs up everything and becomes a real problem to clean.