Thermify told us that the processing power inside each HeatHub is provided by a cluster of 500 Raspberry Pi Compute Modules, either the CM4 or CM5. The whole kit is submerged in oil, and the heat is transferred to the domestic central heating and hot water systems, making it a “plug and play” replacement for a gas boiler.

https://www.theregister.com/2025/10/03/thermify_heathub_raspberry_pi/