Design thermostatic control head with liquid sensor. M30x1,5 threaded connection. In combination with thermostatic-convertible valves, it controls the room temperature and automatically modulates the hot water inlet to the heating terminal, keeping the room temperature constant. Adjustment range 8-30 °C. Antifreeze function: the control head detects a temperature decrease lower than 8 °C and opens the valve to let hot water enter, avoiding pipes and heating body from freezing. Equipped with locking and adjustment range limiting mechanism.