Roborock Saros 20 review: Can adaptive hardware finally solve the limitations of robot vacuums?
The AdaptiLift Chassis 3.0 on the Roborock Saros 20 climbs a high threshold with ease. Picture: RoboRock
The Saros 20 has the unique ability to adjust its angle and height to handle high thresholds and thick rugs, eliminating the need for constant human intervention. This clever mechanical flexibility brings a real sense of autonomy to homes with complex, uneven flooring and varying textures.
The Saros 20 is only 7.98cm tall, so it managed to glide under my sofa and several pieces of heavy wooden furniture that usually collect layers of hidden dust. This slim design works well with the high-precision sensors tucked into its frame, allowing it to reach much deeper into dark corners than I expected.
The real engineering feat, however, happens when the robot encounters a challenge. Older robots treated a door saddle like an impassable wall, but the AdaptiLift Chassis 3.0 changes that. It features liftable main and auxiliary wheels, as well as a climbing arm.
My floors have a little over 2cm of saddle boards under doorways, so most robot vacuums don’t struggle to straddle them. For testing, I placed a 3cm-tall board on top of a saddle board to see how well the Saros 20 could mount and coast over it. I watched in amazement as it climbed it with relative ease. Rather than getting stuck and waiting for me to rescue it, the robot analyses the obstacle, tests the surface, and remembers the best path to proceed.
I also noticed how the chassis responds to different floor types. When the robot senses carpet, it can raise its entire body height. This mechanical adjustment ensures the main brush remains firmly pressed against the rug fibres for improved debris extraction. For thicker rugs with a pile height of up to 3cm, this ability to change its physical stance is a game-changer. If the robot ever finds itself in a tricky spot, it can lift its front, rear, or even just one side of the chassis to free itself.
The docking station features 100°C bidirectional hot-water washing. Most robot mops suffer from a damp, musty smell because they simply rinse with cold water. This dock uses intense heat to scrub the mop pads, which helps break down stubborn grease and food residues left on kitchen tiles.
After the wash, the station uses warm-air drying at 55°C. This step is vital for preventing the mouldy odour that often plagues mop-based robots. The system also includes a fresh-air dustbag drying function to keep the entire base clean and neutral-smelling.
The auto dust emptying system means you could go weeks without even thinking about the bin, with the dust bag lasting up to 65 days.
The upgraded one-piece cleaning tray allows for deeper rinses and more water volume, which keeps the internal components cleaner. There’s also a version of this dock that connects directly to your home's plumbing via a refill-and-drainage system. This setup handles the clean water refilling and waste emptying automatically.
The StarSight Autonomous System 2.0 serves as the brain of the operation. The sensing platform is incredibly responsive, supporting the recognition of over 300 different object types. During my daily use, I noticed it easily identified small charging cables, stray socks, and even tiny pet toys that usually cause other robots to stall or tangle. The sampling frequency is 21 times higher than that of older LDS technology, making the mapping process feel much more fluid and accurate.
The VertiBeam lateral obstacle avoidance helps the robot maintain a perfect line along walls and furniture edges. This prevents the robot from bumping into chair legs or drifting away from skirting boards, ensuring a much cleaner perimeter. The precision even extends to tiny objects that the robot can spot as small as 2cm wide or tall.
The Saros 20 features extendable arms for the mop and side brush that can reach into narrow gaps and toekicks as shallow as 2cm. I found it cleared the fine debris along my kitchen cabinets, which other robots usually leave untouched. This ensures much more complete coverage across every inch of the floor.
Thanks to the massive 36,000 Pa suction power, it pulls grit and embedded debris out of deep gaps in the floorboards.
On hard floors, the dual-spinning mops operate at 200 RPM. The robot can even increase its downforce from 8N to 13N when it detects tougher stains. I tested this on some dried coffee spills and sticky residue on my tiled kitchen floor, and the results were impressive. By raising its wheels and transferring more weight onto the mops, the robot provides a much deeper scrub than standard mop-only robots.
The transition from hard floors to thick carpets is smooth. Because the circular mops attach magnetically, the robot leaves them behind in the dock when vacuuming rugs, so there is no risk of your carpets getting damp. If you use the deep carpet cleaning mode in the app, the height adjusts even more, helping the brush dig deeper into thicker fibres.
The DuoDivide main brush and FlexiArm Arc side brush prevent hair from tangling in the mechanism. I tested the robot on a rug covered in pet hair, and it picked up almost everything without any brushes getting stuck. However, the bin is quite small and has clogged a few times, preventing it from emptying into the dock. Since I didn't get an alert about the clog, I only noticed it was full when I saw it wasn’t vacuuming the floor effectively.
The Saros 20 can switch to mop-only mode, keeping the brushes off the floor to prevent wet debris from spreading across the house. This ensures that once the mop passes over a stain, the floor is actually cleaner rather than just smeared with dirty water.
The Roborock app is mature and offers fine control without becoming difficult to use. The SmartPlan 3.0 learns your specific room types and daily habits to automate your cleaning routines. For instance, it can automatically boost suction in high-traffic areas or reduce power during scheduled quiet hours. You can also set very specific rules for carpets, such as instructing the robot to avoid them entirely or use a specialised deep-cleaning mode.
For those with a smart home, the inclusion of Matter support makes it easy to integrate the Saros 20 with Alexa, Siri, or Google Home.
You can use the camera to check in on your pets and even view brief photo moments captured during a cleaning run. The interface is straightforward, making it easy to manage cleaning zones, adjust mop settings, or schedule a quick vacuum of just one room.
The Roborock Saros 20 is an expensive piece of kit, but it earns its place by solving real-world problems. If you have high door thresholds or thick carpets, its adaptive hardware provides a level of freedom that standard robots simply cannot match.
€1,289 Harvey Norman
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