It is cost-efficient and much better for the environment.
Solar water heating is the conversion of sunlight into renewable energy for water heating using a solar thermal collector. Solar water heating systems are becoming more common worldwide as the best alternative to traditional water heating.
Solar energy is a truly renewable energy source. It can be harnessed in all areas of the world and is available everyday. We cannot run out of solar energy, unlike some of the other sources of energy. Solar energy will be accessible as long as we have the sun, therefore sunlight will be available to us for at least 5 billion years.