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In the present study, the heat transfer to the water channel was studied in two ways, in the case of radiant water heating and in the case of treatment cooling. The ultimate goal was to measure the velocities that develop in water due to heat transfer. The first chapter narrates in more detail the phenomenon that was investigated, the purpose of the study and the final goal. The second chapter introduces the topic of heat transfer methods and the operation of heat transfer mechanisms. The third chapter first presents the main construction of the experiment and the materials used. It is then described how the experiment was built, the construction steps and the technical specifications of the measuring devices are reported. In the fourth chapter, measurements are made and the results of temperature - depth, density - temperature and PIV measurements are determined. The data is then entered into tables. In the fifth chapter all the experimental results are processed, in particular, density-temperature and temperature-depth curves are drawn. Thermal curves are then plotted in AutoCAD. In the sixth chapter all the data are applied and the velocity of the fluid is measured. Based on the results of the experiment, the conclusions and observations were noted during the research