Robot Vacuum Comparison · UK 2026
Dreame L40s Pro Ultra vs Dreame L50s Pro Ultra

Specs, pros and cons compared side by side

Both the Dreame L40s Pro Ultra and the Dreame L50s Pro Ultra are robot vacuums with self-cleaning base stations. This head-to-head sets them side by side using the specs, pros and cons from our full reviews. Dreame specs for the L40s Pro Ultra come from Dreame’s UK manual, with figures from Dreame’s UAE store page; Dreame specs come from Dreame’s own UK pages and manuals.

Quick verdict

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Dreame L40s Pro Ultra

Pick it for: 5,200mAh battery (the L50s Pro Ultra: 4.8Ah) · 3D dual-line laser sensors (the L50s Pro Ultra: a 3D line laser)

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Dreame L50s Pro Ultra

Pick it for: 30,000Pa suction (the L40s Pro Ultra: 19,000Pa) · 100°C mop wash (the L40s Pro Ultra: 75°C)

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Quick comparison

Spec Dreame L40s Pro Ultra Dreame L50s Pro Ultra
Suction 19,000Pa 30,000Pa
Navigation Pathfinder LDS + 3D dual-line laser, AI cameras LDS + 3D line laser, 220 object types
Mopping Extending mops (4 cm), 10.5 mm lift, mop removal Dual Omni-Scrub on Dual Flex Arms, 10.5 mm lift
Dock Empty, 75°C wash, hot-air dry, refill, solution Empty (100 days), 100°C wash, hot-air dry, refill, solution
Runtime Up to 125 min (vacuum and mop, quiet) Not stated
Smart home Alexa, Siri, Google (OK Dreame by update) None listed by Dreame UK
Dreame L40s Pro Ultra

Pros

  • 75°C hot-water mop wash
  • Climbs double-layer steps up to 40 mm
  • AI HD and IR cameras with an LED light
  • 125 minutes of vacuuming and mopping (quiet)

Cons

  • Plumbed-in refill and drain needs the separate water hookup kit
  • Built-in “OK, Dreame” voice control only comes with a later update
  • Dreame doesn’t list Matter support
Dreame L50s Pro Ultra

Pros

  • 100°C mop wash
  • Crosses obstacles up to 40 mm
  • Mops extend on flex arms to reach edges
  • Recognises 220 object types using depth information

Cons

  • No runtime published
  • Dreame’s page doesn’t list any voice assistants
  • Plumbed-in refill and drain needs the separate water hookup kit

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Which should you buy?

Why choose the Dreame L40s Pro Ultra

  • 5,200mAh battery (the L50s Pro Ultra: 4.8Ah)
  • 3D dual-line laser sensors (the L50s Pro Ultra: a 3D line laser)
Why choose the Dreame L50s Pro Ultra

  • 30,000Pa suction (the L40s Pro Ultra: 19,000Pa)
  • 100°C mop wash (the L40s Pro Ultra: 75°C)

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