The thermostatic valve is a widely used control element in heating systems, consisting of the valve body and the thermostatic head. The thermostatic head contains a temperature-sensitive expansion material or gas bellows that expands as room temperature rises, closing the valve cone and throttling the heating water flow. As temperature drops, the valve opens again. The setting is made via a scale (usually 1–5), corresponding to set temperatures between approximately 12 and 28 °C. Thermostatic valves make an important contribution to energy savings and are required by energy regulations. Remote sensors or wireless controllers extend control options for larger rooms or concealed radiators.