A heat transfer unit - with a housing, which contains a tube and comprises a jacket, which encloses the tube subject to forming an annular channel, - with a primary inlet and a primary outlet, which are fluidically interconnected via a primary path conducting a primary medium through the annular channel and via a bypass path conducting the primary medium through the tube, - with a control device for controlling a through-flow of the primary path and of the bypass path with the primary medium, - with a secondary inlet and a secondary outlet, which are fluidically interconnected via at least two secondary paths for conducting a secondary medium, - wherein the primary path is coupled to the secondary paths in a media-separated, heat-transferring manner, - wherein by at least two coils are provided, which are arranged in the annular channel, which helically embrace the tube, and through which a secondary path each leads, - wherein the at least two coils are arranged in the annular channel radially above one another, characterized in - that the at least two coils each form at least two axially adjacent coil packages, in which from each coil a coil portion comprising a plurality of loops extends, - that a radial position of the loop of the respective coil portion within the same coil package is the same, - that the radial positions of the loops of the same coils in the adjacent coil packages are different, - that in the case that n corresponds to the number of coils, at least n coil packages are provided, in which in each case n different radial positions for the loop are possible, - that with each coil the loops of the coil portions assume each possible radial position at least once. - with a housing, which contains a tube and comprises a jacket, which encloses the tube subject to forming an annular channel, - with a primary inlet and a primary outlet, which are fluidically interconnected via a primary path conducting a primary medium through the annular channel and via a bypass path conducting the primary medium through the tube, - with a control device for controlling a through-flow of the primary path and of the bypass path with the primary medium, - with a secondary inlet and a secondary outlet, which are fluidically interconnected via at least two secondary paths for conducting a secondary medium, - wherein the primary path is coupled to the secondary paths in a media-separated, heat-transferring manner, - wherein by at least two coils are provided, which are arranged in the annular channel, which helically embrace the tube, and through which a secondary path each leads, - wherein the at least two coils are arranged in the annular channel radially above one another, - that the at least two coils each form at least two axially adjacent coil packages, in which from each coil a coil portion comprising a plurality of loops extends, - that a radial position of the loop of the respective coil portion within the same coil package is the same, - that the radial positions of the loops of the same coils in the adjacent coil packages are different, - that in the case that n corresponds to the number of coils, at least n coil packages are provided, in which in each case n different radial positions for the loop are possible, - that with each coil the loops of the coil portions assume each possible radial position at least once.