A thermostatic head swaps onto the radiator without any plumbing work, and after that the room temperature can be controlled by time of day. The Zigbee heads are the Sonoff TRVZB and Avatto's TRV06, TRV07, TRV10 and TRV16; Shelly's BLU TRV works over WiFi and Bluetooth and Meross's MTS150HK with HomeKit. Some are sold as a set that includes a gateway or a control unit - the IMOU set, for example, comes with six adapters for different valve threads. Measure the thread on your own radiator valve before ordering.
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A thermostatic head swaps onto the radiator without any plumbing work, and after that the room temperature can be controlled by time of day. The Zigbee heads are the Sonoff TRVZB and Avatto's TRV06, TRV07, TRV10 and TRV16; Shelly's BLU TRV works over WiFi and Bluetooth and Meross's MTS150HK with HomeKit. Some are sold as a set that includes a gateway or a control unit - the IMOU set, for example, comes with six adapters for different valve threads. Measure the thread on your own radiator valve before ordering.