Mova E40 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 3.8 inches tall, so it slides under most sofas and cabinets, though very low furniture may be tight.

It clears obstacles up to 22 mm, so it handles standard door sills but may stop at taller thresholds.

It runs up to 260 minutes per charge, among the longer runtimes, and recharges and resumes for larger homes.