Almost all solar products, including solar water heaters are No Fuss, Minimal or Zero Maintenance equipment. Simply ensure that there is no dust on the solar panels as it forms a screen and blocks sunlight. Wiping the panels once every 5 days is all you need to do. However, you can wipe the solar panels everyday as it would certainly boost the efficiency of the system. Also ensure that the main cold water tank supplying water to the solar tank is always filled optimally. Using automatic level controller can help you achieve this easily.