How often will the dock need attention?

The dock holds a 2.7 L dust bag plus a 4 L clean water tank and 3.5 L dirty water tank, so it runs for weeks between refills or emptying. It also empties the robot's bin and refills its tank automatically between runs.

Can it fit under low furniture?

At 3.1 inches tall, the robot slides under many couches and cabinets. Plan for dock space too, since the dock stands 18.5 inches tall and 16.1 inches wide near an outlet.

Will it handle thresholds between rooms?

Yes. Its 88 mm obstacle clearance lets it climb over door sills and thresholds that stop many robots, making it well suited to multi-room, multi-floor homes.

How does it keep the mop from smelling?

The dock washes the pads with 212°F hot water and adds detergent automatically, then air-dries them at 131°F. That hot wash and dry cycle keeps the pads fresh between cleanings.

Can I control where it cleans and use voice commands?

Yes. It supports no-go zones and multi-level maps for up to 4 floors, plus voice control through its built-in assistant, Amazon Alexa, Google Assistant, and Apple.

How does it adjust mopping for different messes?

It offers 30 moisture levels and applies 14 N of downward pressure at 4,000 RPM, so you can dial in a light pass or a wetter, firmer scrub for grimier floors.

Top 26% overall

Roborock Saros 20 Sonic

Name: Roborock Saros 20 Sonic
Brand: Roborock

A feature-packed premium robot that scrubs hard floors while running itself hands-free.

Currently unavailable

8.14

At a glance

The highlights

Our Rating

8.14/10

Good

Cleaning7.91

Navigation7.82

Features9.81

36,000Pa

Stronger than 98% of robots

Completely hands-free

Empties its own dustWashes its mopDries its mopRefills its waterDrains dirty waterAdds detergentCleans its dock

Vibrating mop pad

Self-washing, extends to edges

LiDAR navigation

LiDAR mapping · AI camera obstacle avoidance

Extends & lifts

Better edge & corner reach

Dual (rubber & bristle)

Anti-tangle design

The good

Pros

36,000 Pa of suction pulls debris and pet hair from floors and carpet.
Fully self-maintaining dock washes pads at 212°F, air-dries, and empties waste automatically.
Dual-sensor navigation combines LiDAR, RGB camera, and 3D structured light for accurate mapping.
Covers up to 1,225 sq ft per run on a 190-minute battery.
Maps up to 4 floors, ideal for multi-story homes.
Extendable side brush and mop reach deeper into corners and along baseboards.

The trade-offs

Cons

Vibrating mop pad scrubs less aggressively than dual spinning or roller systems.
Cleaning rating trails the top tier despite strong suction on paper.
Warranty covers just 1 year, shorter than some competitors.

How the numbers stack up

Performance vs the category

Suction of 36,000 Pa is among the strongest we track, ahead of about 98% of robots (category median 15,000 Pa).
Runtime comes in at 190 min, about average for the robots we track (category median 200 min).
At 1,225 sq ft, single-run coverage is below the typical robot (median 2,150 sq ft).
Threshold clearance of 88 mm is higher than roughly 96% of the robots we track (category median 20 mm).
Mop pressure of 14 N is firmer than the typical robot (category median 10.5 N).

Who it's for

People with multi-story homes and lots of hard flooring who want a truly hands-off machine. Great for busy households and pet owners who'd rather let the dock handle washing, drying, and emptying on its own.

Who should skip it

Anyone whose top priority is scrubbing stuck-on, dried messes off tile should look at a robot with dual spinning or roller mops, since the vibrating pad offers gentler scrubbing.

The bottom line

Our take

The Saros 20 Sonic delivers strong suction, sharp multi-sensor navigation, and a dock that washes, dries, and empties on its own across up to four floors. The vibrating mop is its main compromise, but for near-effortless hard-floor upkeep it's a capable premium choice.

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