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Robot Vacuum S40 Pro or Saros 20?

Robot Vacuum S40 Pro is best suited to homes prioritising pro-grade navigation and vacuum-and-mop cleaning; Saros 20 is best suited to early adopters who want roborock's newest premium floor-care system. Compare their features and compromises below.

ProductLocal priceStatus
Choose Robot Vacuum S40 Pro if...

Homes prioritising pro-grade navigation and vacuum-and-mop cleaning.

Main compromise: buyers who need a robot that is available to buy immediately.
Choose Saros 20 if...

Early adopters who want Roborock's newest premium floor-care system.

Main compromise: buyers who want a lower-cost robot or a compact dock.

Side by side

The meaningful differences.

SpecificationXiaomi Robot Vacuum S40 ProRoborock Saros 20
Claimed suction15,000Pa powerful suction fan blower—
NavigationLDS laser navigation with 360° scanning; 129° ultra-wide-angle structured light for smart obstacle avoidanceStarSight Autonomous System 2.0
Mopping180rpm rotary cleaning, 3 water flow levels, 310mL water tank volume, 10mm automatic carpet pad liftRotating mop module with FlexiArm edge and corner cleaning
Battery5200mAh large-capacity battery—
Run timeCleans up to 180m² on a single charge—
Threshold clearance20mm obstacle-climbing capability—
Cleaning system—Vacuum and mop
Body height—7.98cm
Launch date—24 August 2026
Dock—Brand-New RockDock with hot-water self-cleaning: 100°C hot-water mop washing, 55°C hot-air drying, auto-emptying, automatic water refilling

Official product sources

Head-to-heads we have written

The comparisons people ask for most, with a verdict, the verified specifications and both prices.

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Buy the Saros 10.

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Buy the Roborock Saros 10 unless you need the climb.

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Buy the C28 and save £150.

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Buy the C15 if your lawn is under 500m² and reasonably flat — it is £500 cheaper, in stock, and has the most completely verified specification of any mower we researched.

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Start with the Qrevo S Pro.

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Buy the LUBA 3 AWD for difficult ground.

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