eufy S1 Pro Review

Quick Verdict

The eufy S1 Pro breaks conventional robot vacuum design with its square form factor and revolutionary HydroJet roller mop system. Unlike traditional spinning pads that simply drag dampness across floors, the S1 Pro uses a continuously self-cleaning roller that applies 1kg of downward pressure while spinning at 170 RPM—delivering mopping performance that rivals manual effort. While its 8,000Pa suction is solid but not exceptional, and the lack of a mop-only mode creates some usage limitations, the S1 Pro excels at what matters most for hard floor homes: genuine deep cleaning that leaves surfaces shining rather than merely damp.

HydroJet Roller System: A Mopping Revolution

Most robot vacuums with mopping capabilities simply drag damp pads across the floor. The eufy S1 Pro takes a fundamentally different approach, borrowing technology from upright wet/dry vacuums with its roller mop system.

The Always-Clean Mop features a single wide roller that spans nearly the full width of the robot. As it rotates at 170 RPM, water jets continuously spray the roller while a built-in squeegee removes dirty water into an onboard waste tank. This means the roller is constantly refreshed with clean, ozonated water rather than spreading dirty water across your floors.

In testing, the difference compared to traditional pad systems is dramatic. Dried-on spills that pad-based mops would require multiple passes to remove come up in a single pass with the S1 Pro. The 1kg of downward pressure creates genuine scrubbing action, lifting grime rather than simply moistening it. After cleaning, hard floors show a noticeable shine rather than the streaky residue common with other robot mops.

The limitation is coverage. Because the roller is fixed underneath the robot without extending arms, it misses the final inch or so along walls and in corners. Dual spinning pad systems with extending mops handle edges better. However, for the 95% of floor space away from walls, the S1 Pro’s mopping performance is unmatched in the robot vacuum category.

Square Design for Corner Access

The S1 Pro’s square profile with rounded corners looks distinctly different from typical circular robot vacuums. Eufy designed it this way specifically to improve corner and edge access, and the geometry works as intended—mostly.

The squared-off sides do reach closer to walls and into corners than round robots. In rectangular rooms, the S1 Pro cleans more thoroughly along perimeters where round vacuums leave gaps. The 3D MatrixEye obstacle avoidance system helps the robot hug walls closely without repeated bumping.

However, the square design isn’t a complete solution. Corners still present challenges because even a square robot has rounded corners that can’t perfectly fit into 90-degree angles. The benefit is real but incremental rather than transformative.

An unexpected drawback is the slightly taller profile. At 4.2 inches tall, the S1 Pro won’t fit under some furniture that accommodates 3.5-4 inch round robots. Before purchasing, measure your furniture clearances to ensure the S1 Pro can clean underneath.

Eco-Clean Ozone Technology

One of the S1 Pro’s standout features is its ozone water treatment system. The dock treats cleaning water with ozone, eliminating 99.99% of E. coli and other bacteria without harsh chemicals. This makes the S1 Pro particularly appealing for households with children, pets, or anyone sensitive to cleaning solutions.

The ozonated water not only cleans floors but also sanitizes the mop roller during the automated washing process. After multiple cleaning sessions, the roller emerges genuinely clean rather than building up the musty smell common with traditional mop systems.

One consideration is that ozone effectiveness depends on water quality. The system works best with tap water, and eufy recommends against using distilled or filtered water that lacks the minerals ozone treatment requires for maximum disinfection.

Vacuuming Performance

With 8,000Pa of maximum suction, the S1 Pro offers solid but not exceptional vacuuming capability. For context, newer premium models now reach 10,000Pa to 18,500Pa, making the S1 Pro’s suction mid-range by current standards.

On hard floors, the 8,000Pa proves entirely adequate. The robot lifts everything from fine dust to cereal-sized debris in single passes. The dual side brushes—one on each side rather than the typical single brush—help sweep debris from both directions, improving efficiency in open spaces.

Carpet performance is where the limitations show. On low and medium-pile carpets, the S1 Pro delivers acceptable results, though it noticeably trails higher-powered alternatives in embedded dirt extraction. High-pile or shaggy carpets exceed the robot’s capabilities, often requiring multiple passes or leaving behind debris that higher-suction models would capture.

Pet hair pickup is competent but not exceptional. The rubber brush resists tangling reasonably well, though it requires weekly cleaning to remove wrapped hair. Homes with heavy shedding should expect to supplement with periodic manual vacuuming.

10-in-1 UniClean Station

The base station handles comprehensive maintenance, truly earning its “10-in-1” designation. It automatically empties the dustbin, washes and dries the mop roller with hot water and heated air, refills the clean water tank, dispenses cleaning solution, and even features an LCD touchscreen for direct control.

The automated roller washing is particularly impressive. After each cleaning session, the dock sprays hot water onto the roller while it spins, then uses heated air to dry it completely. This prevents the mold and odor issues that plague simpler mop systems.

The 75-day dust bag capacity is accurate for average households, making the S1 Pro genuinely low-maintenance on the vacuuming side. The water tanks hold 3 liters clean and 2.7 liters dirty, typically sufficient for 2-3 complete house cleanings before requiring manual attention.

One ergonomic touch: the transparent clean water tank lets you see at a glance whether refilling is needed, avoiding the frustration of discovering mid-clean that the robot has run dry.

Navigation and Obstacle Avoidance

The 3D MatrixEye system combines active binocular infrared imaging with an RGB camera and internal LiDAR for comprehensive environmental awareness. This tri-sensor approach enables reliable obstacle detection even in varying lighting conditions.

In testing, the S1 Pro successfully identified and avoided common obstacles like shoes, cables, pet toys, and furniture legs. The robot approaches walls in controlled arcs rather than repeatedly bumping, reducing noise and wear on both robot and furniture.

Mapping is efficient, typically completing initial floor plan surveys in 20-25 minutes. The robot remembers multiple floor levels and automatically recognizes which map to use when moved between floors. You can create no-go zones, set room-specific cleaning schedules, and adjust settings per area through the eufy app.

One quirk is that the obstacle avoidance can be overly cautious. The S1 Pro sometimes leaves wide berths around objects that don’t actually require such distance, leaving small uncleaned patches around table legs or other obstacles that more aggressive robots would clean closer to.

The Missing Mop-Only Mode

Perhaps the S1 Pro’s most significant limitation is the inability to run in mop-only mode. The vacuum always operates whenever the robot is moving, which creates problems with liquid spills.

If you attempt to clean up spilled water or other liquids, the vacuum will suck some liquid into the dust bin, creating a mess and potential odor issues. The robot is designed for maintenance cleaning of already-dry floors, not emergency spill cleanup.

Eufy should add a mop-only mode via firmware update, as this is purely a software limitation. Many users report this as their primary frustration with an otherwise excellent product. Until addressed, you’ll need alternative cleanup methods for liquid spills.

Carpet Detection and Mop Lifting

When the S1 Pro detects carpet, it automatically lifts the mop roller 12.7mm (0.5 inches) off the floor and retracts it into the robot body. This is among the highest lift heights in the category, completely preventing carpet dampness during mixed-floor cleaning runs.

The carpet detection works reliably with even low-pile rugs, typically recognizing the transition within 1-2 inches of the carpet edge. The mop lift is smooth and quick, creating no noticeable delay as the robot transitions between floor types.

However, the tall dock housing means you cannot use the S1 Pro for carpet-only cleaning without the dock present. The robot requires the dock for startup, unlike some competitors that can operate independently once programmed.

Smart Home Integration and App

The eufy Clean app provides comprehensive control with an intuitive interface. Setup is straightforward, mapping is visual and easy to understand, and advanced features are accessible without overwhelming less technical users.

The robot supports Alexa and Google Assistant for voice control, handling basic commands reliably. More complex targeted cleaning requests work when properly configured but require exact room names as specified in the app.

One limitation is 2.4GHz-only Wi-Fi support. This is standard for robot vacuums but worth noting if your network uses exclusively 5GHz bands. Setting up a 2.4GHz guest network resolves the issue in such cases.

Maintenance and Running Costs

Regular maintenance is minimal. The mop roller should be manually cleaned every 2-3 weeks despite automatic washing, taking about 5 minutes to remove and rinse. The dust bin filter requires cleaning weekly and replacement quarterly.

Replacement costs are reasonable: mop rollers are approximately $30 each and last 3-4 months, dust bags are $20 for six and last 75 days each, and filters are $15 for a four-pack replaced every 3 months. This works out to roughly $120-150 annually for consumables.

The ozone generator and heated drying elements increase electricity consumption compared to simpler robots, though the difference is modest—approximately $15-20 per year in additional costs based on average usage patterns and $0.15/kWh electricity rates.

Final Thoughts

The eufy S1 Pro reimagines what robot mopping can accomplish. Its HydroJet roller system delivers genuinely impressive hard floor cleaning that comes closer to manual mopping quality than any spinning pad system. Combined with the Eco-Clean Ozone sanitation and comprehensive automation, it’s an excellent choice for hard floor-focused households.

Who should buy the S1 Pro:

• Homes with primarily hard floors needing genuine mopping performance
• Households prioritizing floor sanitation and bacteria elimination
• Users wanting premium mopping at a lower price than top-tier competitors
• Families with young children requiring chemical-free cleaning
• Anyone frustrated with traditional pad-based robot mops

Who should consider alternatives:

• Carpet-heavy homes needing maximum suction (look at the Roborock S8 MaxV Ultra)
• Those requiring comprehensive edge and corner coverage
• Users needing emergency spill cleanup capability
• Apartments with very low furniture clearances
• Budget-conscious buyers (the Shark PowerDetect NeverTouch Pro offers solid value)

At $1,499, the S1 Pro is expensive but competitive with other premium robot vacuums. Sales frequently bring it to $1,199-1,299, significantly improving the value proposition. For homes where mopping is the primary concern and where its limitations don’t conflict with your specific needs, the S1 Pro delivers performance that justifies its premium positioning. This is mopping done right—comprehensive, effective, and genuinely automated.