Earlier quoted context omitted.
It's how amazon is heating their new buildings in Seattle: http://www.datacenterknowledge.com/archives/2014/09/17/amazo...
Bang! You're no longer dead! (maybe) That's exactly what I mean though you posted it with a click-baity lead-in.
And that comment is valuable because it shows that it's feasible to do with data center water, which is much less hot than the industrial sources you mentioned.