Closed Loop Solar Water Heater

Heat exchangers in the storage tank eliminate a pump but make eventual tank replacement more.

Closed loop solar water heater.

The heated water then flows into the storage tank before it s channeled into the heat exchanger. Here s how a solar powered water heater works. The sun s thermal. Closed loop solar heating system.

These systems are preferable in climates where it rarely freezes. Glycol or some equivalent antifreeze fluid fills. Closed loop solar water heaters have few limitations with collector placement the collector loop is antifreeze filled and are permanently charged. Closed loop or indirect systems use a non freezing liquid to transfer heat from the sun to water in a storage tank.

Closed loop active antifreeze systems are the most versatile and failsafe of all the solar supplemental water heating systems. Most new solar homes feature a variation of one kind or another. 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. Closed loop and drainback solar water heaters drainback and closed loop systems provide freeze protection for year round operation in cold climates.

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. They are more complex but within the capability of many diyers.