There are many types of solar water heating systems that vary in design, materials, thermal collectors, and storage tanks. However, developing new, highly efficient, and affordable solar water heaters remains an important goal. This research aims to conduct a comparative analysis of the technical, economic, and mass-dimensional characteristics of solar water heating systems, considering similar indicators for domestic electric water heaters (DEWH). During the research, the authors employed the methods for economic calculations of solar water heaters. The calculations established that using polypropylene components in the system’s design reduced the cost and mass of the installation and enabled rapid heating (within 1–2 h) of the initial water volume compared to known solar water heaters. The research showed that the developed solar water heating system with a variable water volume (solar water heating systems with intensive water heating) demonstrated improved technical and economic indicators relative to existing analogs and could be manufactured and distributed among the population. The use of polypropylene components in the design of solar water heating systems with intensive water heating reduced the system’s cost and weight, thereby facilitating easier transportation and installation.