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Spinning pads apply real downward pressure and scrub, but they carry whatever they lift until the dock rinses them. Roller mops rinse continuously during the run, so the water at the far end of the floor is as clean as at the start, at the cost of putting more water down.
These are genuinely different machines doing the same job, and most comparisons treat them as trim levels. They are not. Pick based on which failure mode you care about.
The two mechanisms, side by side
Spinning pads
Roller mop
Mechanism
Two circular pads rotating under the robot, typically around 200 RPM where published
One roller across the robot's width, with a scraper and a continuous water feed
Scrubbing pressure
High — the pads press down and rotate
Moderate — the roller rotates but applies less point pressure
Water on the floor
Less. The pad is damp and the floor dries quickly
More. The roller is wet throughout the run
Dirt handling
Carries what it lifts until the dock rinses it
Scraped and rinsed continuously, so the far end of the floor gets clean water
More moving parts and a scraper that needs clearing
Compiled from the manufacturers' published descriptions on 2026-09-01. ECOVACS states a 175mm roller diameter for its OZMO ROLLER; Roborock states 200 RPM spinning mops on the Qrevo S.
The case for spinning pads
Pressure is what removes a dried mark, and two rotating pads pressing down deliver more of it than a roller does. On a sealed wood floor or laminate the lower water volume is also an advantage rather than a compromise — those floors want damp, not wet.
The weakness is obvious once you look for it: the pad picks up whatever it lifts and keeps it. By the far corner of a large floor it is a dirty pad being pressed into a clean floor. Everything therefore depends on how often the robot returns to rinse, which depends on the dock — see self-cleaning docks.
The case for a roller mop
ECOVACS' OZMO ROLLER runs the width of the robot with a scraper and a water feed working against it continuously. The dirty water goes into a tank rather than back onto the floor, so the last room gets much the same treatment as the first. On a large tiled area that is a genuinely different result.
The costs are more water on the floor, which is why the roller is a poor match for older laminate with open seams, and a more complex mechanism to maintain.
Which to buy
Mostly sealed wood or laminate: spinning pads, on a low water setting, with a dock that dries them. Mostly tile or stone, especially a kitchen: the roller. Mixed, with deep carpet in the picture: the retracting design, because the mop leaving the floor entirely solves the transition rather than managing it.
Quick picks
Ranked on the published specifications below. Tap a row to jump to the full write-up.
#
Product
Best for
Mop lift
Price
1
ECOVACSNo photo
ECOVACS DEEBOT X8 PRO OMNIA rotating roller mop that washes itself continuously while it cleans, instead of pushing one increasingly dirty pad around the house.
Roborock Qrevo CurvPublishes both a standard-threshold and a double-layer threshold figure, which is the number most sill-blocked buyers are actually shopping for.
40mm (1.6in) double-layer, 30mm (1.2in) standardRoborock's own wording is that it can overcome standard thresholds up to 3cm and navigate double-layer thresholds up to 4cm. Stated maxima assume a clean square edge; a rounded or worn sill behaves differently.Source: Roborock Qrevo Curv product page — threshold crossing (retrieved 2026-09-01)
On tile and stone, generally yes, because it rinses continuously and the far end of the floor gets clean water. On sealed wood and laminate the extra water is a liability rather than a benefit.
+ Do spinning mops actually scrub?
Yes — two pads rotating under downward pressure is real mechanical work, and it is more pressure than a roller applies at any single point. The limitation is the pad getting dirty, not the pressure.
+ How often does the dock rinse the pad?
It varies by model and by the mode you choose. Many let you set a rinse interval so the robot returns mid-run. On a large floor with spinning pads, a shorter interval is the single most useful setting to change.
+ Which mop uses less water?
Spinning pads. The pad is damp rather than wet, and the floor dries quickly. A roller mop keeps a wet surface against the floor throughout the run, which is exactly what you want on tile and exactly what you do not want on older laminate.
