Introduction
The Dreame L40 Ultra, launched in 2024, established itself as a capable robot vacuum with comprehensive cleaning features. Now Dreame has released two successors in 2025: the L40 Ultra AE and the L40s Pro Ultra. All three models share the same manufacturer and similar design philosophy, but the differences between them reveal distinct positioning strategies. The L40 Ultra AE appears as a more accessible variant with some features stripped back, whilst the L40s Pro Ultra represents a clear upgrade with enhanced capabilities across several key areas.
These are all multifunctional robots equipped with hot water mop washing stations, making them suitable for homes that prioritise thorough floor cleaning. The question becomes which variant best matches your specific needs and budget.
Key Differences at a Glance
- Suction power: 11,000 Pa on the L40 Ultra versus 19,000 Pa on both newer models
- The L40 Ultra AE lacks side brush lift, extension and anti-tangle features present on the other two
- Only the L40 Ultra and L40s Pro Ultra can automatically remove mops at the base for vacuum-only cleaning
- Main brush differs: TriCut 3.0 on L40 Ultra and L40 Ultra AE, dual brush system on L40s Pro Ultra
- Camera setup: dual cameras on L40 Ultra and L40s Pro Ultra, single camera on L40 Ultra AE
- Object recognition: 100 items (L40 Ultra), 120 items (L40 Ultra AE), 180 items (L40s Pro Ultra)
- The L40 Ultra AE cannot detect curtains or recognise stains via AI
- Voice assistant built into L40 Ultra and L40s Pro Ultra, absent on L40 Ultra AE
- Height varies: 103.8 mm on L40 Ultra and L40s Pro Ultra, 97 mm on L40 Ultra AE
- Obstacle climbing: 22 mm (L40 Ultra), 20 mm (L40 Ultra AE), simple step capability on L40s Pro Ultra
Suction Power and Cleaning Performance
The most immediate difference in this comparison concerns suction capability. The original Dreame L40 Ultra delivers 11,000 Pa, which proves adequate for most homes. However, both 2025 releases push this to 19,000 Pa, a substantial increase that becomes particularly noticeable on carpets and when dealing with embedded dirt in floor crevices.
All three models feature elevating main brushes, allowing them to lift the roller when mopping to avoid dragging a wet brush across already cleaned floors. The L40 Ultra and L40 Ultra AE use the TriCut 3.0 brush, which combines bristles with cutting blades designed to slice through tangled hair. The L40s Pro Ultra takes a different approach with its dual brush system, which should theoretically reduce hair entanglement even further.
The side brush situation reveals a clear hierarchy. The L40 Ultra AE has been stripped of several features: its side brush doesn't lift during mopping, doesn't extend to reach corners more effectively, and lacks anti-tangle design. In practice, this means the AE variant won't clean edges and corners as thoroughly, and you'll likely spend more time removing wrapped hair from the side brush. The L40 Ultra and L40s Pro Ultra both retain these advanced side brush capabilities, making them better suited to homes with pets or where corner cleanliness matters.
Mopping System
All three robots employ dual rotating mops with extension capability and the Roboswing movement, which helps the mops reach slightly under furniture edges and skirting boards. Mop elevation reaches 10.5 mm on all models, sufficient to clear most low-pile rugs without dragging wet fabric across them.
The base stations wash mops with hot water and dry them using warm air, which helps prevent odours and bacterial growth. Each station holds 4.5 litres of clean water and 4 litres for dirty water, with a detergent dispenser included. The L40s Pro Ultra features third-generation self-cleaning for the washing tray, compared to second-generation on the other two, suggesting improved maintenance automation.
A significant functional difference emerges with automatic mop removal. The L40 Ultra and L40s Pro Ultra can detach their mops at the base when you want vacuum-only cleaning, useful for quick daily passes without engaging the mopping system. The L40 Ultra AE cannot do this automatically, requiring manual intervention if you want to switch between mopping and vacuum-only modes.
All three detect dirt on both the mops themselves and the floor surface, adjusting their cleaning approach accordingly. However, the L40 Ultra AE lacks AI-powered stain recognition, meaning it won't automatically identify and target specific marks the way its siblings can.
Navigation System
Each model uses a LiDAR turret for mapping and navigation, combined with front-facing 3D laser sensors for obstacle detection. The camera configuration differs though. The L40 Ultra and L40s Pro Ultra both feature dual cameras, whilst the L40 Ultra AE makes do with a single camera. This affects object recognition capability: the L40 Ultra identifies 100 different objects, the L40 Ultra AE recognises 120, and the L40s Pro Ultra extends this to 180 items.
Interestingly, despite having fewer cameras, the L40 Ultra AE actually recognises more objects than the original L40 Ultra, suggesting improved AI algorithms. The L40s Pro Ultra's 180-object recognition represents the most comprehensive obstacle awareness in the lineup.
All three can identify pets and feature LED lighting for navigation in dark conditions. Remote camera access works across the range, letting you check on your home through the robot's perspective. The L40 Ultra and L40s Pro Ultra add curtain detection, automatically adjusting behaviour near window treatments, a feature absent on the AE variant.
Battery and Autonomy
Battery capacity remains consistent at 5,200 mAh across all three models. The original L40 Ultra provides 194 minutes of runtime, whilst the L40s Pro Ultra extends this to 220 minutes. Dreame hasn't specified autonomy figures for the L40 Ultra AE, though with the same battery and similar specifications, it should fall somewhere in this range. The increased runtime on the L40s Pro Ultra makes it better suited to larger homes where a single cleaning session needs to cover extensive floor area.
Smart Features
Obstacle climbing ability varies slightly. The L40 Ultra manages 22 mm obstacles, the L40 Ultra AE handles 20 mm, and the L40s Pro Ultra is specified as handling simple steps without a precise measurement given. In real-world terms, this affects how well each robot transitions between rooms with different floor heights or climbs over door thresholds.
The L40 Ultra and L40s Pro Ultra include a built-in voice assistant, allowing direct interaction with the robot without requiring external smart home systems. The L40 Ultra AE omits this feature, though it still works with Alexa and Google Home like the others. This matters more for households preferring standalone operation without relying on broader smart home ecosystems.
Multifunctional Base Station
Base functionality remains largely consistent across the range. All three automatically empty the robot's dust bin into a 3.2-litre bag, wash mops with hot water, and dry them using warm air. The washing tray self-cleans after each session, with the L40s Pro Ultra's third-generation system presumably offering improved thoroughness compared to the second-generation implementation on the other models.
Water tank capacities match exactly: 4.5 litres clean, 4 litres dirty. Each base includes a detergent dispenser, and all three offer optional kits for permanent plumbing connection, though this requires separate purchase and installation. None of these models include UV disinfection.
Physical Dimensions
The robots measure 350 mm in diameter, standard for this class of vacuum. Height differs though: the L40 Ultra AE stands at 97 mm, whilst both the L40 Ultra and L40s Pro Ultra measure 103.8 mm. That 6.8 mm difference can determine whether a robot fits under certain furniture. If you have low-clearance sofas or bed frames, the AE variant's reduced height might prove decisive.
The onboard dust bin varies between models. The L40 Ultra AE offers 395 ml capacity, compared to 300 ml on the other two. This larger bin means the AE can potentially operate longer before returning to empty, though with automatic emptying at the base, this matters less in practice. Water tanks measure 80 ml across all models.
Base stations share identical dimensions: 340 mm wide, 590.5 mm tall, 456.7 mm deep. You'll need to allocate the same floor space regardless of which model you choose.
Real-World Usage Scenarios
For homes with pets, the L40 Ultra and L40s Pro Ultra present clear advantages. Their anti-tangle side brushes, enhanced suction, and more sophisticated object recognition handle pet hair and the chaos of toys and bowls more effectively. The L40s Pro Ultra's dual brush system and expanded object recognition make it the strongest choice for multi-pet households.
In larger homes, the L40s Pro Ultra's extended 220-minute runtime and higher suction power ensure thorough coverage without mid-clean recharging. The original L40 Ultra's 194 minutes still covers substantial area, but the Pro Ultra provides extra margin for expansive floor plans.
The L40 Ultra AE suits smaller homes or flats where corner cleaning perfection matters less and furniture clearance poses challenges. Its lower height helps it access spaces the taller models cannot reach. The simplified side brush and lack of automatic mop removal reduce functionality, but also mean fewer moving parts that might require maintenance.
All three handle hard floors and mopping with similar competence, thanks to identical mop systems and base station capabilities. The differences emerge more in vacuuming performance, edge cleaning, and smart features than in fundamental mopping quality.
Conclusion: Which One to Choose?
Choose the Dreame L40 Ultra if you want the original implementation with proven reliability, value the dual camera setup and 22 mm obstacle climbing, and can find it at a reduced price now that newer models have arrived. It remains a thoroughly capable robot that handles both vacuuming and mopping well, with automatic mop removal and comprehensive smart features.
Choose the Dreame L40 Ultra AE if you have low furniture that demands the 97 mm height clearance, live in a smaller home where advanced edge cleaning matters less, and want to save money by accepting some feature compromises. The larger dust bin and maintained core functionality make it a practical choice for straightforward cleaning needs without pets or complex floor layouts.
Choose the Dreame L40s Pro Ultra if you want the most advanced option with maximum suction power, longest runtime, most sophisticated object recognition, and the latest dual brush system. It's the best choice for large homes, households with multiple pets, or anyone who simply wants the most capable robot Dreame currently offers. The third-generation base cleaning and enhanced AI justify the premium for those who prioritise cutting-edge performance.
