Dreame L20 Ultra

It auto-empties into a 3.2 L bag and refills the robot from a 4.5 L clean tank, though the mop wash tray needs occasional manual wiping.

The robot is 4.1 inches tall, so it fits under taller furniture but may not clear very low sofas or cabinets.

It clears obstacles up to 20 mm, so it handles standard door sills but may stop at taller thresholds.

Yes. The dock automatically dispenses detergent when washing the mop and refills the robot from a 4.5 L clean tank.