Availability of solar energy being unassured throughout the days, it is necessary to support it by way of storage system for better utility and its wider deployment. The subject work was based on use of phase change material for energy storage and improving its efficiency. The phase change material (PCM) selected was paraffin wax and stored energy was targeted for usage in domestic and process heat applications. Analytical calculations of complete process of charging and discharging of paraffin wax was presented and compared with experimental results. Time required and Number of cycles required for charging and discharging, heat loss calculations were the outcomes of analytical model developed before experimentation. Storage system was integrated with 9.7 m2 Scheffler solar concentrator with cylindrical receiver of capacity 8 L. Receiver was placed at focus of Scheffler solar concentrator where solar rays got concentrated and water got heated up to 900C in 30 min. The two significant changes made to erstwhile work were use of Scheffler high temperature concentrator and close looping of heated water which enabled shortening of heat exchange cycle as well as heating of water in receiver of Scheffler concentrator. The work opened up further possibility of high temperature heat storage system using other than wax as PCM.