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In solar thermal and waste heat recovery systems, the amount of energy supply does not usually match with the process demand. In order to overcome this some form of thermal energy storage (TES) system is necessary for the most effective utilization of the energy sources. Thermal energy storage is the temporary storage unit which stores the heat energy for later use. Among the available technologies for the thermal storage systems, latent heat storage (LHS) systems, using phase change material (PCM) as storage medium, are attractive due to their advantages such as high heat storage capacity and isothermal behavior during charging and discharging processes. The objective of this research work is to study the performance of a TES unit which stores heat energy from available heat sources such as solar heater. For experimental purpose, a solar parabolic trough collector is used as a heat source. A TES unit of 10MJ capacity is designed and fabricated for storing heat and supply hot water for family of 5 to 6 persons. Paraffin wax filled in spherical capsules, is used as PCM in storage tank. Two types of Heat Transfer Fluids (HTFs) such as Water and HP Hytherm 600 are used to transfer heat from the solar parabolic trough collector to the storage tank. They also act as a sensible heat storage material. For different mass flow rates of heat transfer fluid, charging experiments were carried out to verify functioning of the TES unit. It is observed that heat is stored in PCM and water up to a temperature of 650 C when TES unit is connected with heat source (solar parabolic trough collector) and it is also observed that charging time is less when Hytherm …