No C Wire Options
Compare no-C-wire smart thermostats by power method: included adapters and extenders, battery power, and the line-voltage systems to rule out.
Tuya YJ508 APP remote control via Smart Life Tuya Smart
Smart Thermostat for Pilot Wire Heating Radiator White App remote control via MOES app
MOES ZTRV-S01 App and voice control for remote operation
MOES Tuya Zigbee3.0 Smart Knob Thermostat