The ECL Comfort 120 is a universal 1-circuit controller for use in district heating substations, district heating-based installations and boiler installations. The ECL Comfort 120 is operated by an installer app for mobile phone IOS or Android. User interface on controller: 5 LED and 1 push button. The product is an electronic controller for flow temperature control (heating) for different control principles: weather compensated (outdoor sensor), reference room (ON OFF switch), reference room (room sensor), supply temperature compensated (offset from supply temperature).