eufy Omni E28

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

The robot is 4.4 inches tall, so it fits under taller furniture but may not clear very low sofas or cabinets.

It clears obstacles up to 21 mm, so it handles standard door sills but may stop at taller thresholds.

It covers about 1,600 sq ft on a 216-minute charge, enough for most homes, and recharges and resumes for larger ones.