For the storage tank of a solar system for domestic hot water production was analyzed the insulation thickness and material influence. To this end, it was considered a private house, occupied by 3 persons, located in zone I of thermal radiation, for which has been simulated the domestic hot water production process. The tank outlet hot water temperature was considered of 45°C. For simulation purposes, as insulation materials for the storage tank were taking into account glass wool and

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... ne with various thicknesses. Finally, was carried out the comparative analysis of two types of tanks, in terms of the insulation thickness influence on the solar fraction, annual solar contribution and solar annual productivity. It resulted that polyurethane is the most advantageous from all points of view. Solar systems consist of: solar expansion tank, the auxiliary heat source, automation and control system, and water storage system. Heat storage is a key feature of the solar hot water system. Without it, hot water will be available only when the sun actually shines. The solar storage tank allows the system to operate whenever energy is available to provide power when needed. A storage tank is characterized by its ability to effectively supply collectors with a fluid temperature as low as possible. To improve the temperature stratification in solar energy storage, the tank must be designed in order to optimize energy efficiency in the installation. There are several types of solar installations [1], [2]:-With separate heat exchanger and forced circulation; ANALELE UNIVERSITĂłII "EFTIMIE MURGU" REŞIłA ANUL XIX, NR. 1, 2012, ISSN 1453-7397