Central solar heating plant is one of the most profitable, the most efficient and the most easily installable solar technology. However, there is significant limitations for its installation on all the northern roof. There is a gap between the summer heat production and the consumption during this season and inversely for the winter. Then, adding a storage medium ,as a buffer for the heat supply, permits to deal correctly with these gaps. The aim of this project is to modelize a storage concept including a solar heat production, a secondary plant and a storage. Then, the goal is to simulate the storage behavior throughout the year and to validate this behavior.