Both robots use roller mops, so this comes down to how each one executes the details. The eufy Omni S2 scrubs harder (240 RPM roller versus 80 RPM, 15 N of pressure versus 12 N), sweeps edges better with two side brushes including an extendable arm, and holds more debris in its 3 L dock bag. The Narwal Flow 2 counters with sharper navigation around clutter and tight layouts, plus built-in voice control that works without pulling out your phone, making it the pick for homes full of chair legs, cords, and pet toys.
Roller mops are the newest approach to robot mopping, and here are two premium machines that both use them. That shared foundation makes this matchup unusually interesting, because the usual mop-type argument is off the table. Instead the decision hinges on scrubbing intensity, edge coverage, and how confidently each robot reads a messy room. The eufy Omni S2 leans into cleaning hardware with a faster roller, more downward pressure, and a second extendable side brush. The Narwal Flow 2 leans into brains, with a navigation rating that stands well above most robots in this class.
eufy Omni S2
out of 10Narwal Flow 2
These two land close overall, 8.2 for the eufy Omni S2 against 8.4 for the Narwal Flow 2, so neither is a clear step up. The split shows up in the categories. Cleaning goes to eufy at 8.5 versus 7.9, helped by its dual side brushes and bigger dust capacity. Navigation swings hard the other way, 8.3 versus 9.7, which is the widest gap here. Features are nearly even at 7 versus 7.3, and both are priced about right.
Start with the mop rollers, since both robots use them. The eufy spins its roller at 240 RPM and presses down with 15 N, against 80 RPM and 12 N on the Narwal, which means more active scrubbing on dried spills. Edge work favors eufy too, with two side brushes and an extendable arm that reaches into corners, versus a single brush on the Flow 2. Debris handling tilts the same direction: a 3 L dock bag beats 2.5 L, so you empty less often in a shedding household. Navigation flips the story. The Flow 2's 9.7 navigation rating is the standout number in this comparison, and its built-in voice control means you can talk to the robot directly instead of routing commands through a speaker.
The eufy Omni S2 runs two side brushes, one of which extends outward to pull debris from along baseboards, versus a single brush on the Flow 2. Add its 250 mL onboard dust box and the eufy simply gathers and holds more in a single pass.
Both use roller mops, the most effective mopping design available right now, but the eufy works harder: 240 RPM and 15 N of pressure against 80 RPM and 12 N. The Narwal answers with a slightly larger onboard water tank and a hotter 140 °F drying cycle versus 131 °F, which keeps the roller fresher between runs.
Both share a single rubber-and-bristle main brush, so the difference is how much fur the dock can swallow. The eufy's 3 L dust bag holds more than the Flow 2's 2.5 L, stretching the time between bag changes in a heavy-shedding home.
Both pair LiDAR with a camera, AI, and 3D structured light, and the eufy adds an LED to help it see in dark rooms plus mapping for up to 5 floors with a 42 mm obstacle clearance. The Flow 2 earns the higher navigation rating at 9.7 versus 8.3, so it handles cluttered, awkward layouts with more confidence.
The eufy dock carries a 2.5 L clean water tank and 1.8 L dirty water tank alongside its 3 L dust bag, which means fewer trips to refill and dump. Both docks empty debris automatically and hot-air dry the mop, with the Narwal running slightly warmer at 140 °F.
The Narwal Flow 2 packs a 7,000 mAh battery, which is a large cell for this category. The eufy Omni S2 delivers up to 150 minutes of run time, enough to cover a full floor of a typical home before it heads back to recharge.
It's a tie on the essentials: both offer no-go zones, multi-level maps, smart carpet cleaning, smart obstacle avoidance, and voice control through Amazon, Google, and Apple. The Flow 2 adds built-in voice commands, so you can direct it without a separate smart speaker.
| Feature | eufy Omni S2 | Narwal Flow 2 |
|---|---|---|
| Extendable Side Brush | Yes | No |
| Mop Moisture Levels | 3 | Adjustable |
| Mop RPM | 240 RPM | 80 RPM |
| Side Brush Count | 2 | 1 |
| Dock Self-Cleaning | No | Yes |
| Camera Type | RGB camera | Dual HD cameras |
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Neither choice is a mistake here. Pick the eufy Omni S2 if hard floors and edge dust are what bother you most, since it scrubs harder and sweeps wider. Pick the Narwal Flow 2 if your rooms are busy and you'd rather trust the robot to find its own way.
