# Dreame L40s Ultra AE review

Balanced mid price bot with AI avoidance and very long coverage

- Our score: 7.2 out of 10
- Price: $670 (checked Oct 31, 2026)
- Status: on sale
- Best for: large mixed floor homes on a mid budget
- Skip if: corner cleaning and heavy pet hair matter most
- HTML version: https://robotsforthat.com/robot/dreame-l40s-ultra-ae/

## Verdict

Vacuum Wars named it Best Value of the Year for its balanced results: good obstacle avoidance, careful mopping and about 2,462 sq ft per charge. It is a smart buy for mixed floor homes on a mid budget. Pet owners with lots of carpet may prefer the L40s Ultra, which picked up more hair.

## Pros

- Avoided 19 of 24 obstacles
- Very long coverage per charge
- Low water use when mopping
- No hair wrap with TriCut brush
- Hot water mop washing

## Cons

- Pet hair pickup only average
- No extending side brush for corners
- Low 20 mm threshold limit
- Older design than 2026 models
- Dustbin size differs between Dreame pages

## Specs

- suction: 19,000 Pa claimed (Dreame)
- navigation: LDS LiDAR (Dreame); Vacuum Wars measured 0.87 m2 per minute against a 0.70 average
- obstacle avoidance: RGB AI camera plus 3D structured light, 120+ obstacle types (Dreame); Vacuum Wars saw it avoid 19 of 24 objects
- mopping: Dual spinning mops, 10.5 mm lift, MopExtend (Dreame); Vacuum Wars measured only 0.35 g of water left behind and a 269 combined mop score against a 188 average
- self empty: Yes, 3.2 L dust bag, up to 100 days (Dreame)
- dock features: Auto empty, 167 F (75 C) hot water mop wash, hot air drying, self cleaning washboard, auto detergent and water refill, 4.5 L clean and 4.0 L dirty tanks; water hookup kit sold separately (Dreame)
- runtime: Up to 180 min and 1,808 sq ft (Dreame); Vacuum Wars estimated about 2,462 sq ft per charge
- dustbin: 395 ml on the product page, but Dreame's comparison table lists 300 ml or more
- height: 97 mm (Dreame dimensions)
- pet hair: Liftable rubber brush plus TriCut Brush 3.0 (Dreame); Vacuum Wars measured 81% pet hair pickup and 0% hair wrap with the TriCut brush
- app: Dreamehome app with Alexa, Google Home, Siri and Apple Watch (Dreame); Matter support (Just A Dad Approved)
- threshold: 20 mm (Dreame)

## Safety

- recalls: Not checked
- fcc: Not checked
- company status: Active
- warranty: 3 years (Dreame US store)

## Questions buyers ask

### Is the AE or the regular L40s Ultra better?

Vacuum Wars found the AE better at obstacles, mopping and coverage, and the L40s Ultra better on carpet and pet hair.

### Does it wash mops with hot water?

Yes. Dreame says the dock washes pads at 167 F (75 C) and dries them with hot air.

### Can it connect to my water line?

Dreame sells a water hookup kit separately and says it is not available in all regions.

## Sources

1. [Dreame US store: L40s Ultra AE](https://www.dreametech.com/products/l40s-ultra-ae-robot-vacuum)
2. [Vacuum Wars: Dreame L40s series review](https://vacuumwars.com/dreame-l40s-series-review/)
3. [Just A Dad Approved: Dreame L40s Ultra AE](https://justadadapproved.com/product/dreame-l40s-ultra-ae-robot/)
4. [Dreame newsroom: L40s series launch](https://www.dreametech.com/blogs/news/dreame-l40s-series-robot-vacuum-launch)
5. [Dreame blog: L40 Ultra Gen2 vs L40s Ultra vs AE vs CE](https://www.dreametech.com/blogs/blog/robot-vacuum-comparison-l40-l40s-ultra-ae-ce)