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This paper is concerned with the investigation of the performance characteristics of a thermosyphon solar water heating system using a computer simulation model. The instantaneous collector efficiency was determined as a function of flow rate of water and the water temperature difference between the collector inlet and outlet.The model was also used to predict the monthly and yearly solar contribution of the system for two different load profiles. The results of simulation indicate that the yearly solar contribution of the system for a low consumption profile is about 94% as compared to 63% for a high consumption pattern.