15 years ago IBM installed a supercomputer at ETH Zurich that used 60C hot water as its coolant, with a heat exchanger to the building’s hot water system (which

15 years ago IBM installed a supercomputer at ETH Zurich that used 60C hot water as its coolant, with a heat exchanger to the building’s hot water system (which is typically somewhat less than 60C) https://en.m.wikipedia.org/wiki/Aquasar https://en.m.wikipedia.org/wiki/Aquasar