A heating system includes: a heat source machine which heats a heat medium; heating terminals which performs heating using heat of the heat medium; circulation components of the heat medium; a circulation circuit which is configured by connecting the heat source machine, the heating terminals, and the circulation components; and a bypass passage which is arranged in the circulation circuit to bypass the heat source machine. The heat medium heated by the heat source machine and the heat medium of the bypass passage are mixed and circulated. The circulation circuit includes distribution and mixing parts which have a first distribution part for distributing the heat medium heated by the heat source machine, a second distribution part for distributing the heat medium flowing through the bypass passage, and mixing parts for mixing the heat mediums distributed by the first and second distribution parts and corresponding to each other.

Ceiling-mounted radiating elements for heating or cooling rooms, comprising means for connecting the ceiling-mounted radiating elements together, wherein the ceiling-mounted radiating elements comprise at least one through-flow pipe for a heating or cooling medium, and radiating surfaces are arranged radially around said pipe, wherein to connect two ceiling-mounted radiating elements (1, 1), at least one core piece (2) is provided which allows an operationally tight connection of the through-flow pipes (3) of two ceiling-mounted radiating elements (1, 1) to be connected, and at least one mounting rail (4) for positioning at least one connecting part (5) is provided, which locks and secures the ceiling-mounted radiating elements (1, 1) when a connection is produced.