In Germany the startup that became Cloud&Heat Technologies started with the idea to sell a heating system for home powered by some computers. It seems that they

In Germany the startup that became Cloud&Heat Technologies started with the idea to sell a heating system for home powered by some computers. It seems that they have pivoted to sell 19" rack with water cooling that can be connected to a building heating system, more for companies than individual household. https://www.cloudandheat.com/ https://www.cloudandheat.com/ Here is an article from 2020 in German presenting the computer rack as a heating system. http://www.energiesparhaushalt.de/1/intelligent-heizen-durch-server-abwaerme.html http://www.energiesparhaushalt.de/1/intelligent-heizen-durch... It looks like they didn't got much interest in the market and pivoted more to industrial customers. The main purpose now is not a computer node as a heating, but instead recovering the waste heat from computer rack for the heating system.