# Dreame L40 Ultra Gen 2 review

Strong mopping all in one dock bot, but poor obstacle avoidance

- Our score: not scored yet
- Price: $570 (checked Oct 31, 2026)
- Status: on sale
- Best for: tidy hard floor homes that want strong mopping
- Skip if: you have pets with long hair or a cluttered floor
- HTML version: https://robotsforthat.com/robot/dreame-l40-ultra-gen-2/

## Verdict

A capable mopper with a full dock for about $500 to $570, but a step back from the original L40 Ultra in obstacle avoidance. Vacuum Wars saw it avoid only 2 of 24 objects and wrap 67% of long hair. Pick it only for tidy homes without long hair; Vacuum Wars itself points pet owners to the L40s Ultra.

## Pros

- Strong stain removal in Vacuum Wars testing
- 90% carpet sand removal
- Efficient, fast navigation
- Long claimed runtime
- Extending mop and side brush

## Cons

- Avoided only 2 of 24 obstacles
- 67% long hair wrap
- Weak pet hair pickup
- Detergent dispenser costs extra
- No camera or auto mop removal

## Specs

- suction: 25,000 Pa claimed (Dreame); Vacuum Wars measured 0.79 kPa bench suction against a 0.99 kPa average, and Vacuum Chef measured 11.5 CFM airflow against a 9.0 average
- navigation: LDS LiDAR, up to 4 maps (Dreame); Vacuum Wars measured 0.84 m2 per minute, faster than its 0.72 average
- obstacle avoidance: 3D structured light only; the RGB camera of the original L40 Ultra was removed (Dreame, Vacuum Wars); Vacuum Wars saw it avoid 2 of 24 objects and Vacuum Chef scored 30%
- mopping: Dual spinning mops, 10.5 mm lift, 4 cm extension, no auto removal (Dreame); Vacuum Wars scored dried stains 144 against a 108 average
- self empty: Yes, 3.2 L dust bag, up to 100 days (Dreame)
- dock features: Auto empty, mop wash, hot air drying, auto water refill, 4.5 L clean and 4.0 L dirty tanks; detergent dispenser sold separately for $39.99 (Dreame). Dreame lists hot water mop cleaning, but Vacuum Wars says Gen 2 washes with room temperature water
- runtime: Up to 231 min in quiet vacuum mode, up to 1,679 sq ft (Dreame); Vacuum Wars estimated about 1,290 sq ft per charge
- dustbin: 250 ml robot bin plus 3.2 L dock bag (Dreame)
- height: 3.82 in (97 mm) (Dreame)
- pet hair: Vacuum Wars measured 69% flattened pet hair pickup and 67% hair wrap on its 7 in hair test; carpet sand removal was 90%
- app: Dreamehome app with Alexa, Siri, Google Home and Apple Watch; Matter planned in an update (Dreame)
- threshold: 0.79 in (2 cm) (Dreame)
- noise: Vacuum Chef measured 73 dB at max suction, about average

## Safety

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

## Questions buyers ask

### What changed from the original L40 Ultra?

Suction rose from 11,000 Pa to 25,000 Pa, but Vacuum Wars says the camera, built in detergent dosing and hot water mop washing were dropped.

### Does it avoid socks and cables?

Poorly. Vacuum Wars saw it avoid 2 of 24 test objects, so pick up the floor first.

### Does it add floor cleaner automatically?

Only with the $39.99 detergent dispenser, sold separately on the Dreame store.

## Sources

1. [Dreame US store: L40 Ultra Gen 2](https://www.dreametech.com/products/l40-ultra-gen2-robot-vacuum)
2. [Vacuum Wars: Dreame L40 Ultra Gen 2 review](https://vacuumwars.com/dreame-l40-ultra-gen-2-review/)
3. [Vacuum Chef: Dreame L40 Ultra Gen 2 review](https://vacuumchef.com/?p=12466)
4. [Vacuum Wars: Dreame L40 Ultra Gen 2 and D30 Ultra CE](https://vacuumwars.com/dreame-l40-ultra-gen-2-and-d30-ultra-ce/)
5. [Dreame US store: robot vacuums collection](https://www.dreametech.com/collections/robot-vacuums)