The present invention relates to a deflector for a condensed heat exchanger and to an exchanger having such a deflector. The deflector 2 comprises a front cup 3 and a rear cup 4 and the inner surfaces 311 and 411 of the bottoms of the two cups have at least one circulation groove 34, And the two cups are assembled on both sides of the central partition 5 so that each of the grooves forms a channel intended to circulate the heat transfer fluid with the partition wall and the channels of the front and rear cups The heat transfer fluid flows from the inner coupling 40 of the deflector through the channels by flowing on both sides of the central bulkhead, The ring 30 can be circulated.
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