Solar Water Heater

Solar water heater systems almost always require a backup system for cloudy days and times of increased demand. Conventional storage water heaters usually provide backup and may already be part of the solar system package. A backup system may also be part of the solar collector, such as rooftop tanks with thermostat systems. Since an integral-collector storage system already stores hot water in addition to collecting solar heat, it may be packaged with a tank less or demand-type water heater for backup.