eufy Omni S2

It auto-empties into a 3 L bag, washes the mop, and refills the robot from a 2.5 L clean tank, though the wash tray needs occasional manual wiping.

The robot is 3.9 inches tall, so it slides under most sofas and cabinets, though very low furniture may be tight.

It clears obstacles up to 42 mm, so it handles taller thresholds and transitions than many robots.

It stores maps for up to 5 levels, so it suits tall homes where you carry it between floors.