Dell says it's keen on water cooling because it's cheap: data centres nearly always have a cooling tower that lower the temperature of water so it is sensible to put that cool water to good use. But most water-cooled rigs have secondary pumps and/or distribution units that further cool the water before sending it to a rack. Those pumps consume electricity and make heat, two things you want to do less of in a data centre

Given current demographic trends, finding skilled workers is becoming increasingly more difficult in the plumbing, heating, and cooling industries. With an expected shortage of more than 138,000 employees by 2022, the industry faces a “workforce time bomb,” said Tom Applegate, executive director of the Ohio Association of Career-Technical Superintendents, member of the PHCC Educational Foundation’s Board of Directors, and a roundtable facilitator.