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This dissertation is written as a part of the MSc in Energy Systems at the International Hellenic University. Solar Thermal systems for hot water production, have already become a necessary mean for the limitation of energy consumption in domestic applications. Their use has been expanded in other sectors like tourism. In order to answer the dissertations’ initial question about the viability of relative Solar hot water Systems in hotels, a case study is created for the average hotels of every Regional Unit of the Greek Territory. Design parameters are set for the examined systems and all the necessary formulas and recent literature is used in order to establish the theoretical model of the case. This model is used to create an excel file for calculations, which are inserted to the System Advisory Model software. The simulation software provides the minimum solar water heating system (Number of Collectors of certain area, Volume of Storage Tank) that satisfies the considered design criteria for the average hotel of every Regional Unit of Greece. Seventy four systems corresponding to the relative Regional Units, are selected and the total cost of each system is calculated. Then the viability of each individual investment is checked using the Net Present value criterion, and the payback period is calculated. This estimation is conducted for Natural Gas and Diesel as fuels for auxiliary units. A technical view of the investment follows and finally the initial expressed question of the dissertation, upon the viability of Solar Thermal Systems in Hotels, is answered using a technical and an economic point of view.