The device comprises a container (11) for receiving food products, a heat treatment bath (12) disposed downstream of the receptacle, a water feeder, and a lock (16) laid downstream of the receptacle. The receptacle has a channel-shaped section. The lock has an open position for allowing the passage of water for the thermal treatment of food products, and a closed position for retaining the food products in water. The heat treatment bath comprises a tub disposed downstream of the lock, and a delay element (20) provided with vanes. The device comprises a container (11) for receiving food products, a heat treatment bath (12) disposed downstream of the receptacle, a water feeder, and a lock (16) laid downstream of the receptacle. The receptacle has a channel-shaped section. The lock has an open position for allowing the passage of water for the thermal treatment of food products, and a closed position for retaining the food products in water. The heat treatment bath comprises a tub disposed downstream of the lock, and a delay element (20) provided with vanes. The lock is synchronized with the delay element in the closed position when the vane is next to the lock and in the opened position when the tub is free of water. The container is flared towards downstream, and includes a part, which is adjacent to the lock, inclined towards downstream with an inclination of 5-25[deg] . The lock includes a gate articulated on a horizontal axis and provided with holes for the water flow, where the door has lateral edges located at a distance from fixed edges independently corresponding to the position of the gate. The delay element provides a driving function, a grouping function and a food product extraction function. The receptacle comprises an upstream portion (14) including an inlet, an outlet, an upper opening for receiving the food products, a bottom and a valve for adjusting the outlet, and a downstream portion including a slope bottom less than or equal to a slope of the loc
