Building Materials and Construction Components Design Haconn Premium Radiator Thermostat Automatically Regulates Room Temperature by david dos santos Haconn Radiator Thermostat is a control knob that regulates room temperature. The knob has a clean geometric cylindrical form with a distinct bump on the front. The bump serves as a visual reference to the setting: when the bump points up, the temperature is high; when it points down, the temperature is low. Reading a printed number scale is not needed. The outer parts are injection moulded ABS combined with cold pressed metal parts, and the technical parts are metal moulded or machined. A flexible production and assembly setup allows many colour and finish options.