This work’s primary goal is to develop and evaluate phase change matter (PCM) based efficient thermal energy reserve system. The solar heating system may include this thermal storage device as a key component. This project involves the design and construction of a TES tank. The phase change substance that is utilized is paraffin wax. Latent energy of PCM is better because of high specific heat capacity, which may be accessed at any moment. Thermocouples are used to detect temperature in conjunction with indicators and Arduino Sensors. The primary goal of this effort is to resolve the discrepancy between the plentiful solar energy that is accessible accordingly throughout the day. The projected model shows improvement to the overall heat gain within the system and 53,974.28 W of heat provided by hotter water while charging, whereas 38,553.06 W is the heat that the cold water absorbed during discharging. System efficiency for thermal storage is 71.42%. The paraffin wax is charged until it reaches a temperature of around 80–90 °C and the maximum PCM temperature reaches up to 100 °C. This projected work is a component of a larger investigation into the potential for PCMs when there is little need, energy is stored; when there is a large demand, it is released. Thus, if heat pumps can be used to store heat for use during peak hours by running them during off-peak hours, money may be saved.