Series CRC120 is an outdoor sensor based controller suited for larger systems and valves such as 3F. The controller is designed to provide a high level of comfort thanks to the possibility to set a perfect characteristic heating curve and at the same time provide energy savings for the house owner. The regulation is based on outdoor sensor feedback and an adjustable characteristic heating curve. An offset / parallel adjustment of the characteristic heating curve may be activated by an external signal for example night settings. For applications with well insulated building and quick heating systems such as radiator circuit can a temperature filter be activated to delay an outdoor temperature change to avoid an imbalance between estimated and actual heating demand.