eufy S2 Review: Incredible Self-Cleaning Mop, But Is Carpet Performance a Dealbreaker?

After spending a full month testing the eufy S2 and comparing it against more than 130 robot vacuums we’ve reviewed, it’s clear that this is one of eufy’s most ambitious robot vacuums to date. Before filming our review, we turned to Reddit and asked users what they specifically wanted us to test. The response was enormous, with most people focusing on carpet cleaning, mopping performance, pet hair handling, obstacle avoidance, app features, and long-term reliability.

After extensive real-world testing, the eufy S2 proved to be a very capable robot vacuum, particularly for hard floors and low-maintenance cleaning. However, it also comes with a few compromises that buyers should understand before deciding if it’s the right fit for their home.

Unboxing and Setup

The setup process is straightforward and refreshingly simple. Inside the box, eufy includes the robot, the Omni station, cleaning solution, fragrance modules, an extra vacuum bag, and the usual documentation and accessories. Getting started only takes a few minutes. After installing the fragrance module, filling the clean water tank, and adding the cleaning solution, the robot is ready to charge and begin mapping the home.

The Omni station immediately stands out as one of the nicest docking stations eufy has produced so far. Its design feels premium, and the built-in touchscreen display gives it a more polished, flagship feel compared to many competing robot vacuums. While most users will still rely primarily on the app, the touchscreen is a nice addition that makes the entire system feel more refined.

First Impressions

Our initial impressions after the first few cleaning runs were mixed, though mostly positive. The fragrance system is an interesting idea, but in practice, it doesn’t add much to the cleaning experience. While the fragrance pods smell pleasant when opened directly, we rarely noticed the scent while the robot was actively cleaning. Most users looking to freshen a room will probably find candles or air fresheners more effective.

The biggest highlight early on was easily the Duo Spiral Brush system. This is the same anti-tangle brush setup found on the eufy E25 and E28, and it performed exceptionally well in our home, which includes three long-haired people and a long-haired dog. Hair tangles, which are still a constant frustration with many robot vacuums, were virtually nonexistent during our testing period. For households that constantly deal with hair buildup on brush rollers, this alone could be one of the S2’s most appealing features.

We were also happy to finally see eufy incorporate both an extending side brush and an extending mop system. While neither system is perfect, they do improve the robot’s ability to clean along walls and edges compared to earlier eufy models.

Carpet Cleaning Performance

One of the biggest questions from Reddit users was whether the eufy S2 finally delivers a major upgrade in carpet cleaning performance. On paper, the specifications certainly suggest it should. The S2 features an enormous 30,000 Pascals of suction, putting it far above many competitors in raw advertised power.

However, real-world carpet performance tells a more complicated story.

In our carpet deep-cleaning tests, the S2 scored 80 out of 100, which ended up being identical to the scores achieved by the eufy E25 and E28. Surprisingly, the older S1 Pro still outperformed the newer S2 with a perfect score in the same testing environment.

The reason likely comes down to the brush design. While the Duo Spiral Brush excels at preventing hair tangles, it doesn’t seem to agitate carpet fibers as aggressively as the S1 Pro’s setup. The result is a vacuum that performs adequately on carpets but doesn’t feel especially aggressive or deep-cleaning compared to carpet-focused robots like the Roomba J9+.

In day-to-day use, the difference may not be dramatic for many users, especially since most people won’t notice the gap between an 80 and 100 score during casual cleaning. Still, buyers hoping for a major leap forward in carpet performance may walk away slightly disappointed.

Mopping Performance

Mopping is where the eufy S2 truly separates itself from many competitors.

The large roller mop system does an excellent job keeping floors consistently clean by continuously refreshing the roller with clean water while simultaneously removing dirty water during operation. Unlike traditional spinning disc mops that often smear dirty water around, the S2 leaves floors looking genuinely polished after cleaning sessions.

The station also adds a tremendous amount of convenience by automatically washing and drying the mop roller after each cleaning run. Throughout testing, our hard floors consistently looked clean without noticeable streaking, and the mop roller itself still looked surprisingly fresh after weeks of regular use.

When it came to dried-on messes and textured flooring, results were more mixed. Simple dried stains were handled without much issue, but heavily textured grout lines still retained some residue after cleaning. In our tile testing, the S2 removed roughly half of the grime from difficult grout lines, which honestly exceeded expectations given how stubborn the mess was to begin with. Realistically, no robot mop currently available fully replaces manual scrubbing for extreme stains, but the S2 still performs very well for everyday maintenance cleaning.

One thing we did notice over time was some debris buildup underneath the mop roller and station tray. This is fairly common for roller-style mops, though it does mean occasional manual cleaning is still required.

Edge Cleaning and Navigation

Edge and corner cleaning remains an area where the S2 still feels slightly behind some competitors.

The extending side brush and extending mop definitely help, but the robot itself often rides too far away from walls and cabinets during cleaning runs. As a result, small gaps along baseboards and corners are still fairly common. The side brush also retracts a bit too quickly in corners, limiting its overall effectiveness.

What makes this more frustrating is the lack of customization within the app. Brands like Dreame and MOVA allow users to fine-tune edge cleaning behavior and side brush aggressiveness, while the S2 currently offers very little control in this area.

Obstacle avoidance performance was solid overall, though not class-leading. The S2 consistently avoided cords and pet waste during testing, which are arguably the most important obstacles for any robot vacuum to recognize. However, it still occasionally bumped into smaller household clutter like toy trucks, dog toys, and cans. This is fairly typical behavior for robot vacuums, but it means most users will still want to set no-go zones for problem areas.

Pet Hair Performance

For pet owners, the S2 performs exceptionally well.

After a full month of heavy use, we experienced virtually no hair tangles on either the main brush or side brushes. The cyclonic filtration system also did an excellent job maintaining suction performance even when the dust bin became heavily packed with hair and debris.

The self-empty station handled thick pet hair surprisingly well too, though completely overfilled bins occasionally required more than one emptying cycle to clear everything out. Overall, for homes with pets or long hair, the S2 is easily one of the better robot vacuums we’ve tested in terms of daily maintenance reduction.

App Experience and Smart Features

The eufy Clean app remains easy to navigate and simple to use, offering features like multi-level mapping, no-go zones, room-specific cleaning, adjustable suction settings, and virtual walls. For most users, the app covers the basics without becoming overly complicated.

However, compared to flagship apps from brands like Roborock, Narwal, and Dreame, eufy’s software still feels less advanced overall.

While the S2 technically supports Alexa, Google Assistant, Apple Home, and Matter integration, the actual smart home functionality is currently very limited. At the time of testing, voice commands were restricted to very basic controls like starting, pausing, or locating the robot. Room-specific voice cleaning commands and deeper automation options were notably absent.

We also found the app lacking when it came to consumable monitoring. Cleaning solution levels and dust bag tracking rely more on timers than actual real-time measurements, which feels underdeveloped for a flagship robot at this price point.

Battery Life and Maintenance

Battery performance varies heavily depending on suction settings. On lower power settings, the S2 covered impressive amounts of floor space before needing to recharge. However, running maximum suction dramatically reduced overall coverage and efficiency.

The robot itself moves quickly and cleans efficiently in open spaces, but its high suction levels come with noticeable battery trade-offs. Recharge times averaged just under five hours during our testing.

Long-term maintenance, however, ended up being one of the more impressive aspects of the S2. After a month of daily cleaning with essentially no manual maintenance, the dust filter still looked nearly brand new thanks to the cyclonic filtration system. While some debris buildup under the mop roller is unavoidable, overall upkeep was surprisingly manageable for a robot performing both vacuuming and mopping every day.

Final Thoughts

The eufy S2 clearly positions itself as a flagship robot vacuum focused heavily on hard floor cleaning and day-to-day convenience. Its roller mop system is excellent, the Omni station is one of the best eufy has ever produced, and the Duo Spiral Brush system makes it an outstanding option for homes dealing with large amounts of hair.

At the same time, the S2 feels somewhat specialized. Carpet cleaning performance does not significantly improve over less expensive models in eufy’s own lineup, edge cleaning still trails some competitors, and the software experience lacks the advanced customization available from brands like Dreame, Narwal, and Roborock.

For homes with mostly hard flooring where low-maintenance mopping is the top priority, the eufy S2 makes a lot of sense and delivers a genuinely premium cleaning experience. But for buyers focused primarily on deep carpet cleaning, aggressive edge cleaning, or highly advanced smart home controls, there are currently more balanced flagship options available.