Eufy Omni S2 Review: Flagship Robot Vacuum and Mop

Eufy, the connected-home brand owned by Anker, had already made its case with the Omni E25 and its washing-roller mopping system. Unveiled at CES 2026, the Anker Eufy Omni S2 keeps that recipe and pushes every slider a great deal further. On paper the specification is generous: 30,000 Pa of suction, five times that of the original Omni S1; a HydroJet 2.0 washing roller that cleans itself continuously; a UniClean 2.0 station that handles just about everything; and an unusual extra in the shape of a built-in fragrance diffuser. It also sits right at the top of the market, which sets a high bar for the product. The underlying source test covered several weeks of daily use in a real home.

The first surprise on unboxing is the absence of a LiDAR turret. The Omni S2 relies instead on an RGB camera and a 3D dToF (time-of-flight) sensor to find its way, which gives it a lower profile than average and a clean silhouette topped by an attractive translucent cover. The practical consequence is that it slides under furniture that turret-equipped robots can only skim past.

Underneath, Eufy has taken care over every element. The DuoSpiral main brush, designed to move hair and pet fur towards the bin without tangling, works alongside an extendable side brush that reaches out to pull debris from corners. At the back, the HydroJet 2.0 washing roller can also extend by a few millimetres to run along skirting boards. The dust bin uses cyclonic filtration, complete with a small LED light that lets you watch the dust swirl: completely pointless, and therefore essential.

One last flourish is a compartment that houses a fragrance capsule, diffused by the robot while it cleans. Three scents are supplied: bergamot and lychee, citrus and basil, and bamboo and sage. More on those later, because the result is more discreet than the promise.

The UniClean 2.0 station is the heart of the system. At 38.7 cm wide and 67 cm tall it plays the verticality card: its footprint on the floor is smaller than that of most all-in-one docks, at the cost of extra height. Its curvaceous black and silver shell stands apart from the usual white blocks in this segment, and it is one of the rare stations there is no urge to hide away.

The list of jobs it performs is dizzying: charging, automatic emptying of the bin into a 2.5 L bag, refilling the robot's water tank, automatic detergent dosing from a 600 mL cartridge, washing the roller with hot water at 60°C, hot-air drying at 55°C, and even water electrolysis, which Eufy describes as treating the water directly in the tank.

A touch-sensitive LCD screen and physical buttons on top of the station pause a cycle, recall the robot or switch between vacuuming and mopping. It sounds like the sort of feature nobody would use; in practice it is very handy when the phone has been left in another room. The one real ergonomic complaint is that the clean-water tank has to be removed to reach the dust bag, though that is a small annoyance given how rarely the bag needs changing.

Setup runs through the Eufy app, guided step by step: connection to 2.4 GHz Wi-Fi, a firmware update, then the initial mapping run. Within a few minutes a ground floor was modelled with remarkable precision, furniture and floor types included.

The app offers 2D or 3D maps, management of five floors, no-go zones, room merging and splitting, and fine room-by-room settings covering suction power, roller humidity, number of passes and cleaning order. How often the robot returns to the station to wash its roller is adjustable too, from 15 to 85 minutes. Usefully, automatic emptying can be triggered several times during a single cycle, which counts for a lot in a home full of pet hair.

What is missing is a native "vacuum then mop" mode that would automatically chain the two passes across the whole house. You have to recreate it yourself with custom routines, which works but takes a little patience to configure. On a flagship model, the omission is surprising.

On the smart-home side, the Omni S2 answers to Alexa, Google Home and Matter, but with basic voice commands only: start, pause and return to base. There is no reliable room-by-room voice launch, and no remote access to the robot's camera. That last absence is the more surprising of the two, because the robot does carry a front-facing camera and Eufy built its reputation on security cameras. A firmware update could yet put that right.

Deprived of LiDAR, the Omni S2 could have been hesitant. It is nothing of the sort. The pairing of RGB camera and 3D dToF sensor, driven by the CleanMind AI system, produces decisive navigation: the robot does not go round in circles or cover the same patch ten times over, and it works through rooms methodically, edges first and then the centre. Even in low light it holds its course. The only oddity noted was some imprecise room splitting on the initial map, corrected in two minutes in the app.

Obstacle detection is of a very high standard. Cables, shoes and bags are identified and cleanly avoided rather than nudged along. Reasonably large toys are avoided; smaller objects, especially dark ones, can still be pushed about, a weakness shared right across the category. Stairs never caught it out, and it always freed itself from the tight gaps between furniture where so many robots end their run calling for help.

The ground floor of the test home has a doorway with a step of roughly 5 cm. It is a formidable trap: most robots clear it in one direction, carried by momentum, then stay stranded on the other side, unable to climb back. The Omni S2 is one of the very few to manage the round trip, without hesitation or acrobatics. Its adaptive chassis, which can raise the body, makes a genuine day-to-day difference. Eufy quotes obstacle clearance of around 4 cm; in practice that 5 cm step never caused a problem. Ordinary thresholds and rugs are swallowed without a second thought.

At a claimed 30,000 Pa the Omni S2 joins the leading pack of 2026, where last year's flagships topped out at around 20,000 Pa. On hard floors the verdict is clear-cut: dried soil carried in on work boots disappears from the intermediate power levels onwards, and fine gravel and blades of grass in the hallway are taken up without complaint.

In a home with animals, the DuoSpiral brush delivers on its promise. After weeks of daily use, no hair or fur had wrapped itself around either the main brush or the side brush, and that is the kind of detail that changes life over the long run.

On rugs and carpet the robot detects the textile, cuts the water, lifts its roller and adapts its power to the pile height, up to 5 cm according to Eufy. Results are very good on short pile and decent on long pile, without opening as clear a gap as the specification sheet suggests over robots half as powerful. Physics has its limits: beyond a certain threshold it is the brush doing the work, not the pascals. Edge cleaning, helped by the extendable side brush, is convincing, even if the robot sometimes runs a little wide of the walls and leaves a thin band to pick up in the tightest corners.

The biggest surprise is the noise. A measurement of 50.6 dB at one metre in operation is genuinely good, particularly given the power on board, and the robot can be left running through a video call or a film without turning the volume up. Noise naturally climbs at full power and during automatic emptying, but never to the point of being intolerable.

Battery life raises no concerns: the 4,600 mAh battery covers a large home in a single cycle at medium power, and recharge-and-resume takes over in extreme cases. A full charge takes about four hours.

This is where the Omni S2 justifies its existence. The HydroJet 2.0 roller scrubs the floor at a pressure of 15 N, roughly 1.5 kg, while cleaning itself continuously thanks to a twin internal scraper: dirty water goes to its dedicated tank instead of being spread back across the floor. That puts an end to the smearing-mop effect, the historic failing of entry-level washing robots.

On laminate and tiles the result is the best any robot has managed here: no marks, no film, and floors that genuinely feel clean underfoot. Everyday dried stains such as coffee, mud and paw prints come away in a single pass thanks to roller pressure and stain recognition, which prompts the robot to work harder on stubborn areas. Sugary, sticky stains sometimes need a second pass, and dirty tile grout is only partly recovered. No robot works miracles on that front, but the Omni S2 comes closer than the rest.

Water management is another good surprise: laminate, which is sensitive to moisture, dries within moments behind the robot. The extendable roller also reaches dirt right at the base of skirting boards and kitchen units, a real advantage over conventional rotating pads.

Then there is the fragrance diffuser, presented by Eufy as the first aromatherapy system built into a robot vacuum. On opening the capsules the scents are pleasant. During cleaning, however, the diffusion is very discreet: you have to walk immediately behind the robot to notice it, and the house retains no lasting trace. Agreeable up close, negligible across a home, and a candle scents a room more effectively.

Low maintenance is one of this robot's big arguments, and it holds up. After weeks of daily use in a busy home, the DuoSpiral brush needed no intervention at all: not a hair to cut away, not a thread to untangle. Cyclonic filtration does the rest, separating coarse particles from fine ones before the filter, which stays clean far longer than on a conventional robot. Eufy quotes up to a year without filter maintenance; that cannot be confirmed over the long term yet, but at the end of the test period the filter did look as good as new.

Day to day, that leaves three things to keep an eye on. First the 2.5 L bag, whose life depends on the household: expect several weeks, and noticeably less with animals. Then the station's washing tray, where hair and residue collect beneath the roller; a brush over it every two or three weeks is enough. Finally the dirty-water tank, which collects a fine sludge and can develop odours if it is forgotten, so a regular rinse settles the matter. The app displays the state of each consumable and gives warning when something needs attention.

The real issue is recurring cost. Detergent and fragrance capsules are proprietary, which locks owners into Eufy's ecosystem for replacements. The 600 mL cartridge supplied will last several weeks, but replacing it is a recurring outlay, and nothing obliges the brand to keep those replacements cheap. It belongs in the budget alongside the usual bags and filters.

The Omni S2 is a flagship, competing with the top of the ranges from Roborock, Dreame and others rather than with the mainstream. What justifies that position is the roller mopping, the adaptive chassis and the breadth of the UniClean station, not the fragrance diffuser, which is too faint to add much across a home.

Within Eufy's own range, the Omni E25 uses the same washing-roller principle in a simpler package, sacrificing raw suction power and some of the station's refinements.