Closed Loop Solar Water Heater

Closed loop solar heating system.

Closed loop solar water heater.

The heated water then flows into the storage tank before it s channeled into the heat exchanger. The sun s thermal. Propylene glycol and the new bio green are common antifreeze materials we have several options for exchanging the heat to the clean domestic hot water. Most new solar homes feature a variation of one kind or another.

Heat exchangers in the storage tank eliminate a pump but make eventual tank replacement more. Glycol or some equivalent antifreeze fluid fills. When the controller senses that the sun is shining and your tank needs a warm up it signals the pump to send water through the black collector panels. Here s how a solar powered water heater works.

Closed loop or indirect systems use a non freezing liquid to transfer heat from the sun to water in a storage tank. The heated water is then stored in a tank sent to a tankless water heater or used directly. These systems are preferable in climates where it rarely freezes. Closed loop solar water heaters have few limitations with collector placement the collector loop is antifreeze filled and are permanently charged.

Freeze protection is necessary in cold climates. A special water heater tank incorporating a heat exchanger works in conjunction with one or more flat plate roof mounted collectors. Closed loop active antifreeze systems are the most versatile and failsafe of all the solar supplemental water heating systems.