Dyson R3 Nurovi Spot+Scrub UV · iRobot Roomba Combo j7+

A stain it can see gets washed until it clears; a stain it cannot classify gets the ordinary pass, and Dyson’s own footnote concedes results vary by stain type.

Hot-water roller washing in the dock removes the grimiest chore, at the cost of a dock that heats water to 158°F beside the floor it serves.

Retractable arm is a mechanical win but mop-washing burden stays manual; the pad comes off the robot’s underside, gets washed by hand or replaced, and goes back on, which eats into the hands-off claim.

vSLAM camera navigation is dependent on lighting and visual landmarks; dark rooms, reflective tile, and sparse spaces break mapping continuity compared to LiDAR platforms.

Buyers who need independently tested suction and stain detection

The 30,000 Pa rating and the near-200-substance recognition are Dyson claims. Dyson's own footnote says results may vary by stain type and severity, and no third-party test exists yet.

Homes that are mostly carpet or high-pile rugs

Dyson has not published how the wet roller behaves on carpet, whether it lifts, or a carpet cleaning figure for the R3. The stain loop is described only for hard floors.

Shoppers comparing runtime, size and noise before buying

No robot dimensions, weight, battery capacity, runtime or noise rating appear in any launch material or Dyson page reviewed for this record.

Buyers in the UK or Australia wanting one this year

Vacuum Wars reports the UK and Australian launch following in early 2027, and Digital Reviews Network says Australian pricing has not been announced.

Buyers who need a documented navigation sensor suite

Launch coverage names a camera, green illumination and UV light for stain detection, but Dyson has not described how the R3 maps rooms or which sensors it navigates by.

High-pile carpets or thick, matted fibers

Owner reports document suction loss on shag and deeply matted carpet. The mop arm's benefit is negated if the vacuum component cannot first remove embedded hair.

Homes with 5 GHz, only Wi-Fi or weak signal coverage

vSLAM + app mapping requires stable 2.4 GHz connectivity. Wi-Fi dropouts cause navigation resets and mapping fragmentation across sessions.

Owners needing automated mop pad washing

The pad attaches to the robot's underside and is removed by hand; there is no wash station anywhere in the system. Hand washing or a stock of spare pads is required for multi-day operation.

Homes over 3,500 sqft or complex multi-floor layouts

Mopping is bounded by one hand-filled onboard tank and one pad per run, so a large hard-floor area needs a refill and a pad change partway through. Vacuum coverage scales better than mopping does here; map count is not the constraint, since the robot stores a separate Smart Map for each level.