The work is the design of a high-efficiency solar water heater using the modern methods, the concept of material science and the thermodynamic are used to improve the performance. Based on the research conducted, important design parameters such as types of the collector, absorbers’ coatings, insulation types, and mechanisms of heat transfer that all effect upon thermal efficiency, are considered. A systematic literature review was done on identifying state of the art practices and a theoretical framework and simulation-based analysis is developed. The methodology combines computational modeling and experimental validation used for determining the performance under varied climatic conditions. Contingent on the results, it seems that selective surface coatings, vacuum insulation and the leanest collector tilt angles add significantly to efficiency gains.