The plate in brief

Every computer is also a heater. One kilowatt of continuous computing gives off about 24 kilowatt-hours of heat a day, before recovery losses. So the server room is liquid-cooled, and the warm coolant passes through a heat exchanger to preheat water. A heat pump finishes the job and fills the hot-water store that feeds the showers. In summer, the extra heat is rejected on the roof.

Then the scheduling gets smart. At a sunny midday, the roof panels power discretionary jobs like rendering. On a winter morning, recovered heat helps make hot water. When the battery is low, the discretionary GPUs sleep. Flexible work runs when power is abundant and heat is useful.

Questions, corrections, or a site where this could be built? Write to me.