Roborock Qrevo

It auto-empties into a 2.7 L bag, washes the mop, and refills the robot from a 5 L clean tank, though the dock does not clean its own wash tray.

The robot is 3.8 inches tall, so it slides under most sofas and cabinets, though very low furniture may be tight.

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

It covers about 3,229 sq ft on a 180-minute charge, and recharges and resumes to finish larger homes.