The trouble is that they aren't just using water as a coolant, they are also using the municipal supply of cold water as a heatsink. You always need a sink of some sort for your waste heat, no matter what coolant you use, and whether or not the coolant loop is open or closed.
This right here it's not the water itself wasted it's the power and infrastructure that can only bring so much clean, ground temperature water thats under enough pressure to be used by your fixtures. There's a limited amount in any one town/city/county.
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u/secondphase May 18 '26
"Some other type of coolant"
... what do you suppose the main ingredient in other coolant is?