Pakistan is in shortage of power due to gap in its supply and demand of energy. Country's energy and power sectors mainly depend upon the crude oil and fossil fuels in which natural gas is main source of energy in the domestic and commercial zones, yet due to the poor management and undiscovered reservoirs the demand of gas is also high and situation in the winter gets worse when the demand reaches to its peak. In contrast, Pakistan industrial sector uses daily thousands of gallons of hot waters for its different processes and hot water mainly heated through conventional sources of energy. In this paper a sustainable and alternative approach has been adopted for these issues, the study has shown that the solar thermal energy can play a significant role in the Pakistan's geography. A newly introduced technology discussed is Solar Thermal water heaters. The analytical analysis has been carried out to compare conventional heaters (gas) with the solar water heaters. The cost analysis, energy saving, payback period was found by the mathematical approach.