In the paper is implemented a general evaluation of existing solar combisystem, including an analysis of the different components and operation principles. From this evaluation, in the thesis are highlighted positive and negative aspects of existing solar combisystem – proposing possible solutions. Finally, in the master thesis has been described a new prototype of solar combisystem and in the framework of this work it has been developed the algorithm for the controller. The algorithm has been tested and validated using the TRNSYS (A Transient Systems Simulation program) model of the prototype.