The use of a latent heat storage system using phase change materials (PCMs) is an effective way of storing thermal energy. In this paper a latent heat storage box is designed and developed. The study focus on design and fabrication of hot water tank, the results are obtained by experimentally carrying out the charging and discharging process at different mass flow rates. Coconut oil has been used as the phase change material because of its availability in the market and low cost. This type of thermal energy storage system has a good potential of storing latent heat and can be used in solar water heating application. Performance analyses have done with ANSYS software.