A solar heating system is a set of combined components and subsystems whose main objective is to use solar energy and convert it into hot water for domestic use. In the present research, two cases of the solar system are compared. The first case is the traditional case, which is a solar heating system that contains only one storage tank. The second case utilizes two storage tanks. The study was performed by T*SOL software for both the solar performance analysis, and financial account. The results are discussed in both cases. A comparison between the results of the two cases is also discussed. It is concluded that the T*SOL is a suitable solar analysis software to be used in Egypt. The results indicated that the second case, containing the two tanks, is the best solution for the present solarheating system.