ECOVACS WINBOT W2 PRO Omni vs W2S Omni

W2 PRO Omni vs W2S Omni at a glance

Head to head

The best result in each row is marked, based on my testing and the manufacturer specs. Where the robots tie, both are marked.

The tally is a guide, not my verdict. How dirty your windows get and how much you care about the frame lines matters more than any single row.

Same station, different robot

Before the differences, it helps to see how much these two share, because it is most of the package.

Both come with ECOVACS’ portable 6-in-1 station. It stores the robot, charges it, holds the cleaning solution, anchors the safety rope, runs the robot on battery and acts as a control panel. You carry it to the window, set it on the floor and clip the robot to the glass.

Both robots navigate with WIN-SLAM 4.0✕WIN-SLAMECOVACS’ mapping system for window robots. The robot measures the pane first, then plans a back-and-forth route instead of bumping around at random.. Both are rated for about 110 minutes on battery, and both can run plugged in with no limit.

The difference is the robot itself. The W2S Omni adds 8,000 ((Pa|Pa (pascals)|The unit for suction. A higher number means the robot presses itself to the glass harder, which helps on high or outside windows.)) of rated suction, a spinning TruEdge✕TruEdgeA small rotating scrubber at the robot’s edge that reaches into the strip along frames and corners, where a flat pad normally leaves a dirty line. scrubber for the frames, triple nozzles on both sides and five named cleaning modes. The W2 PRO Omni uses a flat microfiber pad, three wide-angle nozzles and an edge-focused mode.

Our tip: If your windows are already clean most of the time, the shared station matters more than the robot, so start by asking whether you need TruEdge at all.

Design, station and build

Side by side on the floor, the two kits are hard to tell apart. Each robot is a square crawler with a pad underneath, and each station is a tall box with a handle, a reel for the rope and a slot that holds the robot.

The W2 PRO Omni robot and station together weigh about 19 lb, which I could carry from room to room with one hand. The W2S Omni station felt heavier, and by the end of the test I was planning my sessions room by room to save trips up the stairs.

The W2S Omni robot is the busier of the two underneath. The TruEdge scrubber sits on one side of the pad, and there are nozzles on both faces so it can wet the glass whichever way it travels.

The W2 PRO Omni’s station doubles as storage, charger and safety anchor.

After four weeks, both stations had a few scuffs on the base and nothing worse. Neither robot lost suction or started to wander on its route.

The one design detail I would change on both is pad washing. Neither station cleans its own pads, so every session ended at the sink.

Setup and the first week

The W2S Omni took about 15 minutes out of the box, most of it spent on the ECOVACS HOME app and a firmware update over Bluetooth. After that, each session took about 3 minutes to prepare and 1 to 2 minutes to pack away.

The W2 PRO Omni was quicker to learn. Setup per session was about 3 minutes, moving to the next window took under a minute and packing away took about 2 minutes.

In week one I stayed with both robots for every run, which I recommend. On the W2S Omni I learned to wait for the "attached" voice prompt before letting go, and on the W2 PRO I learned to treat the safety rope as part of the robot, not an accessory.

Our tip: Update the W2S Omni’s firmware before its first clean, because the update takes a while and you do not want it to start halfway up a window.

Suction and safety on high glass

Both robots scored 9.0 for safety, and I never had one come off the glass. That is the score I care about most on a window robot.

The W2S Omni is rated at 8,000 Pa of suction. ECOVACS does not publish a figure for the W2 PRO Omni, but on smooth glass it held just as firmly in my hands-on tests, including on a balcony on a breezy day.

The real safety system on both is the station. The rope runs from the robot to the station, which sits on the floor and acts as an anchor, and the robot holds on for up to 30 minutes if the battery runs low while it returns to its starting point.

That matters because the alternative to a window robot is often a ladder. The U.S. Consumer Product Safety Commission has counted more than 164,000 emergency room-treated injuries a year related to ladders, and a robot that cleans the outside of an upstairs window from inside is a genuinely safer way to do it.

The spray system and pads

The W2S Omni sprays from triple nozzles on both sides of the robot, so it wets the glass ahead of the pad whichever way it travels. Its tank holds about 80 ml.

The W2 PRO Omni uses three wide-angle nozzles. ECOVACS says its water pressure is doubled over earlier models, and in practice the mist was even and fine, with no drips on clean inside glass.

On both, the pad decided more than the spray. A damp, well wrung-out pad gave the W2S Omni a 9.0 on the same window where a soaking-wet pad scored 6.2 and a dry pad scored only 4.8.

W2S Omni: same window, different pad

My scores out of 10 on the same pane.

The W2 PRO Omni told the same story over several windows. A fresh, damp pad scored 8.8, the same pad on a second dirty window scored 7.0 and on a third only 5.2.

In practice, one pad handled about three or four inside windows on the W2 PRO before I swapped it. On the W2S Omni I swapped to a spare halfway through a whole-house session.

Water quality matters too. Hard tap water carries dissolved calcium and magnesium, which the U.S. Geological Survey classes as hard✕Hard waterTap water with lots of dissolved calcium and magnesium. As it dries, the minerals stay behind as white spots and can clog spray nozzles. above 120 mg/L, and those minerals are what leave spots behind as the mist dries.

Our tip: Use only the ECOVACS cleaning solution in both robots, because household glass cleaners can foam, leave a film and clog the nozzles.

Navigation, modes and controls

Both robots measure the window first and then work it in a planned back-and-forth route. Neither ever got lost on a rectangular pane in my testing.

The W2S Omni gives you five modes. Fast is a quick pass for glass that is already fairly clean, Thorough is the balanced default I used most, Deep adds extra passes, Heavy-Duty✕Heavy-Duty modeThe W2S Omni’s most intensive mode, with extra passes and more scrubbing for glass that has gone months without a clean. is the most intensive and Edge concentrates on the borders. You can also steer it by hand from the app.

The W2 PRO Omni is simpler, with standard cleaning and an edge-focused mode. That simplicity is part of why it scored 8.7 for ease of use against the W2S Omni’s 8.6.

W2S Omni: relative time per window

Relative timings from my sessions on the same pane.

Our tip: Start dirty outside glass on Heavy-Duty and save Fast for windows you cleaned in the last week or two, because Fast on neglected glass leaves a faint haze.

How well they clean

On everyday dirt, both robots did a very good job. The W2S Omni was a little better across the board, and the gap grew as the dirt got harder.

On dust and pollen, the W2S Omni scored 9.2 and the W2 PRO Omni 9.0. On fingerprints, it was 9.0 against 8.8, which you would only notice side by side.

The difference showed on months of outside grime. In one pass, the W2S Omni on Heavy-Duty scored 8.0, while the W2 PRO Omni scored 6.2. A second pass with a fresh pad brought the W2 PRO up to 8.4, which is excellent, but it took twice as long.

Months of outside grime

My scores out of 10, same street-side windows.

The W2S Omni cleared months of outside grime in one Heavy-Duty pass.

Edges and corners

This is where the extra money goes. A flat pad cleans the middle of the glass beautifully and leaves a dull strip along the frame, the edge gap✕Edge gapThe thin strip next to a window frame that a flat, square pad cannot reach, so dirt builds up there between cleans., and TruEdge is ECOVACS’ answer to that.

In the center of the glass, the two robots were almost identical: 9.4 for the W2 PRO Omni and 9.5 for the W2S Omni. Along the frames, the W2S Omni scored 8.6, while the W2 PRO scored 8.0 with its edge mode on and only 6.6 with it off.

Inside corners were the clearest gap. The W2S Omni scored 7.6 and the W2 PRO Omni 6.2, which on a sunny day meant a visible little triangle of dirt in each corner.

Inside corners

My scores out of 10.

Along frames

Same windows, same week.

Our tip: Turn on the W2 PRO Omni’s edge-focused mode for sliding and French doors, because it lifted my frame score from 6.6 to 8.0.

If you clean the corners with a cloth anyway, the gap matters less. If those dull triangles are what bothers you about robot-cleaned glass, the W2S Omni is the robot to get.

Battery and power modes

Both stations are rated for about 110 minutes on battery. ECOVACS rates the W2 PRO Omni for about 55 m² per charge and the W2S Omni for up to about 65 m² in Fast mode, with less in Thorough.

I ran the W2 PRO on battery about three-quarters of the time, and it covered every ground-floor window with charge to spare. The W2S Omni behaved the same way, and on a big day I simply plugged the station in.

On both, the plug-in mode has no time limit. That is handy for long runs of glass doors in a sunroom.

Rated coverage per charge

Manufacturer ratings. Slower, more thorough modes cover less.

Our tip: Charge the station overnight before a big window day, because stopping mid-session to recharge breaks the rhythm on either robot.

Which windows and surfaces suit each

Both robots are happiest on big, flat, rectangular glass. Neither likes arched or unusually shaped windows, and both struggled with panes divided by raised strips.

The W2 PRO Omni was excellent on floor-to-ceiling glass and very good on sliding doors with edge mode on. Small windows were fine, but setting up the station took longer than the clean itself.

The W2S Omni was excellent on sliding doors and big picture windows, very good on upper-floor outside glass and very good on a glass office partition with small joins.

Robot, ladder or cleaning by hand?

Both of these robots changed how I cleaned windows. Instead of saving the outside glass for a twice-a-year job on a ladder, I cleaned it from inside every few weeks.

By hand, a room of windows took me about 20 minutes of scrubbing. With either robot, my hands-on time was mostly setup and rinsing pads, about 4 minutes of sink work per session.

By hand I was faster on the first door, but the robots were just as good on the third door as on the first. My arm was not.

Hands-on cleanup per session

My own timings.

Our tip: Clean outside glass on an overcast morning, because hot direct sun dries the mist before the pad gets to it and leaves streaks.

Noise, pets and family life

Neither robot is quiet. Both make a steady fan whoosh, roughly like a hair dryer on low, which is easy to hear in the same room and fades to a hum one room away.

I could hold a phone call in the next room with either one running. In the same room, I turned the TV up.

The rope is the thing to watch with pets and children. My cat sniffed it on day one, and from then on I ran it along the wall, away from where anyone walks.

A whole-house cleaning day with each

In week four I gave each robot a full day: inside and outside of the ground floor, the balcony doors and the upstairs windows I can reach from inside.

With the W2 PRO Omni, the whole day took about 45 minutes of my own time. That was about 10 minutes the evening before laying out pads and charging the station, about 25 minutes moving the station and clipping the robot on, and about 10 minutes rinsing pads at the end.

With the W2S Omni, my time was similar, but the outside glass needed fewer second passes, so the robot’s total time was shorter. The heavier station was the one thing that slowed me down on the stairs.

Cleaning and maintaining them

Upkeep is nearly identical. Both pads are washed by hand, both robots are topped up from a bottle of solution and both need a quick wipe of the sensors and underside after outside glass.

The W2S Omni has one extra job: the TruEdge scrubber picks up grime from the frames, so I wiped it down after outside sessions. It took seconds.

On both, I checked the safety rope for fraying before every high window. A rope is cheap to replace and is the only thing between the robot and the patio.

Our tip: Keep two pads in rotation and rinse them together at the end, because washing one pad between every window wastes more time than it saves.

Mistakes to avoid

Most bad results I had came from the same few habits, and they apply to both robots.

On the W2 PRO Omni, the biggest one was a single pass on neglected outside glass, which left a haze. On the W2S Omni it was using Fast mode on that same glass.

My four weeks, week by week

Week one: inside windows on both, watching every run. Both scored 7.4, and both felt like smart tools I was still learning.

Week two: outside and balcony glass. The W2S Omni jumped to 8.4 once I learned to use Heavy-Duty, and the W2 PRO reached 8.2 on battery on the balcony.

Week three: the W2 PRO dipped to 8.0 on very dirty street-side glass while I learned the two-pass method. The W2S Omni climbed to 8.7 on a glass partition and small windows.

Week four: routine. The W2 PRO finished at 8.6 and the W2S Omni at 8.9.

Week four satisfaction

My weekly scores out of 10.

Real-life scenarios

These are the moments during testing where one robot clearly pulled ahead.

For clean, regularly wiped glass, the W2 PRO Omni does almost everything the W2S does.

My scorecard

These are my own scores out of 10, from my single reviews of each robot after four weeks of daily use.

Overall scores

My overall editorial scores out of 10.

The W2S Omni wins overall because it cleans better where it is hardest: in the corners, along the frames and on neglected outside glass. The W2 PRO Omni is a touch easier to use and just as safe.

Which one should you buy?

Start with how dirty your windows get and how much the frame lines bother you.

If you clean often and mostly look at the middle of the glass, the W2 PRO Omni is all the robot you need. If your outside glass goes months between cleans, or you notice that dull strip along every frame, the W2S Omni is the better buy.

For everything I found on each robot, see my W2 PRO Omni review and W2S Omni review.

Living with them long term

Both need the same care: pads rinsed after each session, the rope checked regularly and the station kept charged. The W2S adds a quick wipe of its TruEdge scrubber.

What I would change: automatic pad washing on both, a lighter station for the W2S Omni and stronger corners on the W2 PRO Omni.

W2 PRO Omni vs W2S Omni specifications

From manufacturer specifications and my own testing.

How I tested and compared them

I used each robot as my main window cleaner for four weeks, on inside windows, sliding doors, balcony glass and neglected street-side windows. A second HouseholdMe tester shared the robots, and we wrote the notes together.

I scored each robot on the same windows, in the same weeks, with the same pads and solution, and timed every setup, session and cleanup.

I then checked my notes against each manufacturer’s specifications and owner documentation.

• Cleaning: dust, fingerprints, rain spots and months of outside grime.
• Edges: frames, inside corners and frameless edges.
• Safety: suction hold, power-loss behavior and the safety rope.
• Ownership: setup, pads, refills, storage and noise.