Abstract: A shutoff device is implemented as a ball cock for insertion into a line for media, and has a housing insertable into the course of the line, a shutoff ball rotatably disposed in the housing, and a pivot drive for the shutoff ball. The pivot drive is removably connected to the housing. The shutoff ball has a passage in an area facing toward the pivot drive, and a chamber extends through the passage from the pivot drive into the interior of the shutoff ball. A sensor embedded in the chamber.

Abstract: A solar heat powered system has at least one solar collector and a feed line for solar fluid leading away from the solar collector. The feed line is divided into at least two partial lines in sections. There is at least one heat exchanger arranged in each partial line. By dividing the feed line for the solar fluid, the plurality of heat exchangers can each be embodied to be more compact.