Any IoT device
I beg to differ, I finally found a useful one.
https://www.amazon.co.uk/gp/product/B01D8LY77Y
Cheaper than half of the "normal" thermostatic radiator valves on the market, sane manual mode, Bluetooth support, support for controlling it from Linux (there are scripts on github) and most importantly NO F*CKING CLOUD!!!
Biting the hand that feeds IT
