Narwal Freo X Ultra Robot Vacuum and Mop Combo, 8200Pa Robot Mop & Vacuum, Auto Mop Drying/Washing, Self-Empty, Zero-Tangling, DirtSense™, Maintenance-Free Base Station (Renewed)

Why it's worth it

Narwal's twin spinning mop heads press down with 12 N and spin at 180 RPM, and the base keeps clean and dirty water permanently apart, so the robot never re-wets your floor with gray water. It also compresses dust internally instead of loudly blasting it into the base.

Hygiene is the pitch, and it holds up. The Good Housekeeping Institute rated this model's clean and dirty water separation the most hygienic mop system it evaluated — the only one that kept gray water from carrying between rooms in back-to-back cleaning. If the thought of a robot mopping the bathroom and then the kitchen bothers you, this is the answer to that.

DirtSense is the other clever piece. The robot reads how dirty the rinse water is and keeps scrubbing until it comes back clean, so a muddy entryway gets more passes than a spare bedroom does. You're not guessing at how many passes to schedule. It sorts that out on its own.

From our review of 7 robot vacuum mop combos, by David Sinclair, Managing Editor

What we like

• +Hygiene is the pitch, and it holds up
• +DirtSense is the other clever piece
• +It's the quiet one
• +The Zero Tangling brush rides on a single floating arm, and Narwal cites SGS and TÜV certification for a 0% tangle rate with…

What to know

• –Carpet is its weakness
• –The app splits people
• –It's thirsty. In hard-water areas, some owners switch to distilled water to keep mineral scale out of the base and the lines