Heat exchanger unit

The utility model relates to a heat exchanger unit, include first heat exchanger, second heat exchanger and incite somebody to action first heat exchanger with the sheet metal outer shell that the second heat exchanger wrapped up, wherein, first heat exchanger includes: first casing, set up in the inside a plurality of heat exchange tubes of first casing, the heat exchange tube includes at least one vortex section, the vortex section is provided with the vortex structure, set up in inside the first casing, be used for supporting the backup pad of heat exchange tube, set up in two hydroeciums at first casing both ends, two hydroeciums pass through a plurality of heat exchange tubes are linked together, and set up respectively in cooling water inlet on the casing, first cooling water outlet, the import of first hot water source and the export of first hot water source, the first cooling water outlet of first heat exchanger is connected the secondary cooling water import of second heat exchanger, the first hot w