Indoor Systems Installed on the floor of the warehouse building to the roof-mounted collectors and working with the principle of unification model. Collectors on the roof is placed in a convenient location. Or between the roof on the warehouse floor of the building is established. Collectors in the warehouse with the help of the circulation pump with antifreeze fluid heat exchanger in the jacket or serpentine passed from inside the water tank is heated. The number of indoor models, the collector and the storage volume is calculated according to the needs of hot water.