| − | 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 - according to the EIA<ref>http://www.eia.doe.gov/glossary/glossary_t.htm [[EIA]] glossary</ref> - 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.'' |