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.
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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.''