Hard Water impact on solar water heater causes many problem damaging all the components like pipes, valves and many other parts because the water contains calcium, magnesium carbonate leading the high maintenance of solar water heater. These minerals deposits at the inner surfaces of the solar system like pipes, panel, tubes and in the other parts and over the times, pipes and valves get clogged and it decreases the overall performances of supplying the water from solar water heater and due to this it requires maintenance and occasional descaling are necessary to mitigate the hard water impact on solar water heaters.