A '''thermosiphon system''' is a [[solar]] collector system for water heating in which circulation of the collection fluid through the storage loop is provided solely by the [[temperature]] and [[density]] difference between the hot and cold fluids. | A '''thermosiphon system''' is a [[solar]] collector system for water heating in which circulation of the collection fluid through the storage loop is provided solely by the [[temperature]] and [[density]] difference between the hot and cold fluids. |