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Abstract: This paper shows the modelling of a domestic solar water heating installation. The results of simulations performed on daily basis for a solar system (collector with surface of 2 m2 and a storage tank of 200 litres), operated in Constantine (Algeria), which provides hot water for heating. The installation consists in a solar flat collector, a water storage tank, a source of auxiliary energy and radiators. We analyse more accurately the influence of the thermosiphon-flow rate and consequently the stratification degree of the tank on the water heating system performances. The interest of this study resides in the approach used to model the tank and in the analysis of the number of the nodes used on the gained energy. [Copyright &y& Elsevier]