TellS Solar water heaters use the solar energy from the sun to generate heat (not electricity) which can then be used to heat water for showering, space heating, industrial processes or even solar cooling. Solar water heating systems comprise various technologies that are used worldwide increasingly, uses for solar water heater in Domestic: Bungalows and Apartment, Commercial: Hotels, Hospitals, Dairies, and Industrial: Process Industries, Preheating boiler feed water, wherever & whenever you need hot water