Drainage channel and use of a drainage channel in a sanitary facility, in particular a shower facility

A drainage channel (10) for sanitary facilities, with a channel body (11) extending in a longitudinal direction (v), comprising:

• at least one first channel portion (12) having a bottom (13) and at least two side walls (14) arranged opposite one another on the bottom (13), wherein the first channel portion (12) is adapted to accommodate at least one heat exchanger unit (100) for heat recovery;
• and
• at least one second channel portion (15) with a receiving region (16) for receiving a channel cover element (17), which adjoins the first channel portion (12) from above, the receiving region (16) of the second channel portion (15) has an outer width (x) transversely to the longitudinal direction (v), which is smaller than a width (y) of the first channel portion (12),
• wherein the channel body (11) has at least one undercut (18) through which the receiving region (16) of the second channel portion (15) is arranged transversely to the longitudinal direction (v) within at least one of the side walls (14) of the first channel portion (12).