Robot Vacuum Comparison · UK 2026
Roborock Saros 20 vs Roborock Saros Z70

Specs, pros and cons compared side by side

Both the Roborock Saros 20 and the Roborock Saros Z70 are robot vacuums. This head-to-head sets them side by side using the specs, pros and cons from our full reviews. Roborock specs come from Roborock’s own UK pages and manuals.

Quick verdict

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Roborock Saros 20

Pick it for: 36,000Pa suction (the Z70 has 22,000Pa) · Mop wash with water up to 100°C (the Z70: up to 80°C) · Climbs double thresholds up to 8.8 cm (the Z70: 4 cm)

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Roborock Saros Z70

Pick it for: OmniGrip robotic arm moves small items out of the way (the Saros 20: recognises 300+ obstacle types)

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Quick comparison

Spec Roborock Saros 20 Roborock Saros Z70
Suction 36,000Pa 22,000Pa
Navigation StarSight 2.0 (3D ToF + RGB camera) StarSight 2.0, cameras on the arm and front
Mopping Dual spinning pads, 200 RPM, up to 13N, FlexiArm, auto removal FlexiArm Riser Mop, 22 mm lift, auto removal
Dock Empty, wash up to 100°C, 55°C dry, refill, detergent Empty, wash up to 80°C, 55°C dry, refill, detergent
Runtime Not stated Not stated
Smart home Alexa, Siri, Google, Matter Alexa, Siri, Google (Matter by update)
Roborock Saros 20

Pros

  • 36,000Pa suction, the joint highest in Roborock’s UK range
  • Mop wash with water up to 100°C
  • Climbs double thresholds up to 8.8 cm
  • Slim 7.98 cm body for low furniture

Cons

  • Roborock does not publish the runtime or tank sizes
  • Cleaning solution is not included
  • Large dock (381 x 475 x 488 mm)
Roborock Saros Z70

Pros

  • Robotic arm moves small items out of the way
  • StarSight 2.0 navigation with two cameras
  • Automatic detergent from a 590 ml tank
  • Slim 7.98 cm body

Cons

  • Lower suction than the Saros 20 and Saros 20 Neo
  • Matter support is still to come by update
  • The arm lifts items up to 300 g only

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Which should you buy?

Why choose the Roborock Saros 20

  • 36,000Pa suction (the Z70 has 22,000Pa)
  • Mop wash with water up to 100°C (the Z70: up to 80°C)
  • Climbs double thresholds up to 8.8 cm (the Z70: 4 cm)
Why choose the Roborock Saros Z70

  • OmniGrip robotic arm moves small items out of the way (the Saros 20: recognises 300+ obstacle types)

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