Thermosiphonkollektor sowie Verfahren zu dessen Herstellung

The invention relates to a thermosiphon collector comprising at least one liquid reservoir (I) for a liquid heat carrier and at least one solar absorber (II), wherein at least the solar absorber (II) is formed from a double-walled extruded plate with at least two ducts (1, 2), wherein at least one first duct (1) is fluidically connected to a lower region (Ia) of the liquid reservoir (I) and at least one second duct (2) is fluidically connected to an upper region (Ib) of the liquid reservoir (I), and in each case at least one first duct (1) is fluidically connected (1-2) to at least one second duct (2) at that end (E) of the solar absorber (II) which is remote from the liquid reservoir.