A thermosyphon heat exchanger includes a plurality of first conduit elements and a plurality of second conduit elements. Each first conduit element has a heat absorbing portion defining a first plane and a first fluid transfer portion defining a second plane. The first plane and the second plane are twisted relative to each other. Each second conduit element has a heat releasing portion and a second fluid transfer portion or a connection to a fluid return line. At least one first conduit element and at least one second conduit element are connected to each other such that the fluid in the thermosyphon heat exchanger can flow in a closed loop through said first conduit element and said second conduit element.