The STECA TR 0603mc solar thermal controllers represent a combination of previously successful TR 0502 and TR 0603 temperature difference controllers. Their main feature is the system's operational data storage, via SD card. These controllers can perform 40 different pre-programmed functions, offering compatibility with different applications. They contain a large display, showing animated control circuits, offering operational monitoring. They also feature six inputs for temperature or pulse value measuring, Grundfos Direct SensorsTM input for various flow and temperature measurements. Also, pump and switch valves can be controlled via three outputs, with speed control possibilities. These controllers operate on a stable STECA TS Analyzer 2 software, that enables visual results, in forms of values and graphs.