Sustainability of the global energy drive is in doubt due to ever increasing demand that promotes negative effects on the environment. Among the renewable clean energy alternatives, the utilization of solar energy is, without a doubt, one of the most encouraging ecological avenues. In a solar thermal system, the solar thermal energy can be exploited via heating working fluid circulating through a heat collector. This book chapter swiftly addresses the concept of different enhancement techniques of solar thermal collector systems by way of integration. The introduction of different integration technologies, their applications, use of working mediums, energy storage techniques, heat recovery systems, hybrid photovoltaic systems, performance efficiency and contributions are presented and discussed elaborately. The standards for assessing thermal performance of the solar thermal systems are addressed. The main specifics, present status and existing difficulties related to the types of solar collector systems integration are identified. Several other factors affecting the thermal performance, characteristics of the solar thermal systems and material advances possibilities were also summarized. Thermal energy storage (TES) is one of the most promising technologies to enhance the efficiency of renewable energy sources; advances in phase change materials and nanocomposites are very promising to enhance further performance; future research should be carried out in these and other areas for the greater uptake of solar still technology. © 2018 by Nova Science Publishers, Inc.