Solar water heating systems, or solar thermal systems, use heat from the sun to warm domestic hot water.
Solar thermal collectors are panels which are (usually) fitted onto your roof. The panels contain tiny tubes of water which are heated by the sun. This heated water can reach up to 90 degrees C. It is passed down into your home where the heat is transferred to water in a storage tank or cylinder via a coil.
Solar energy is available throughout the year, not just in the summer. Grant collectors can operate in direct and diffused sunlight so even when it is cloudy, they are able to work.