A hydromassage bath (1, 101) comprising: one or more internal side walls； a perimeter recess (5, 105) that extends substantially along the entire perimeter of the bathtub (1, 101) on said inner side walls, said perimeter recesses (5, 105) being adapted to accommodate a plurality of nozzles ( 9, 109) of descending emission arranged along said perimeter recess (5, 105) to perform a hydromassage function； at least a portion (7, 107) of wall configured to cover at least partially said recess (5, 105), such that it defines a perimeter groove (8, 108) open towards the inside of said bathtub (1, 101)； a bottom (13, 113) comprising a drain conduit (14, 114) for draining liquid from the bath (1, 101)； a false bottom element (15, 115), overlapping and arranged separately from said bottom (13, 113), the extent and arrangement of said false bottom (15, 115) being such that it defines an opening (16, 116) of perimeter drain that extends along the perimeter of the false bottom element (15, 115) itself； means for emitting gas from said perimeter drain opening (16, 116) into said bathtub (1, 101), wherein said at least a portion (7, 107) of wall is arranged separated from a respective side wall for define a corresponding air space (11, 111) internal to the respective side wall.Una bañera (1, 101) de hidromasaje que comprende: una o más paredes laterales internas； un rebaje (5, 105) perimetral que se extiende sustancialmente a lo largo de todo el perímetro de la bañera (1, 101) en dichas paredes laterales internas, estando adaptados dichos rebajes (5, 105) perimetrales para albergar una pluralidad de boquillas (9, 109) de emisión descendente dispuestas a lo largo de dicho rebaje (5, 105) perimetral para desempeñar una función de hidromasaje； al menos una porción (7, 107) de pared configurada para cubrir al menos parcialmente dicho rebaje (5, 105), de manera que define una ranura (8, 108) perimetral abierta hacia el interior de dicha bañera (1, 101)； un fondo (13, 113) que comprende
