This RF exterior sensor fulfils the requirements of modern weather compensated heating regulation. The solar cell guarantees the long-term low-maintenance functionality of the sensor. An integrated DCF signal enables automatic conversion to summer/winter time. The RF base station, which is integrated into the boiler, acts as interface between the RF exterior sensor, the boiler and the weather compensated RF controller placed in the room. Sensor and base station are attractive in their simplicity of design and function.