Cool stuff. Well, warm stuff!
Cloud&Heat is a German company that has started offering “distributed cloud heaters,” which are big insulated metal cabinets that access your water tank and are crammed with hard drives, controller boards, and some fans.
The idea is that you’d buy and install one of these cabinets for about the same cost as a conventional heating system, and hook it up to your ducting, water system, electricity (3 phase at 400v), and Internet (at least 50 Mbit/s).
Cloud&Heat pays for the Internet connection and the power required to keep it running, and you get as much warm air and hot water as the servers in the box can produce, free of charge, as it quietly performs cloud computing tasks.