This study proposes a new model operation for an intermediate thermal storage (ITS) tank for solar water heater system. It combines passive-charge active-discharge (PCAD) in a single storage tank. potentially reducing the number of components of the system and improving the net energy balance. The charge process is done by heating the storage material using an electric heater. https://parisnaturalfoodes.shop/product-category/grey-white-hair-shampoo/