Dreame L40 Ultra

Not sold at any store we monitor today, so not in our ranking.

Customer rating ★ 4.1 from 1,859 reviews at Amazon

Which robot is right for your home? Find out in 7 questions →

Before you buy, compare it with 2 recommended alternatives

No store here sells this model today, so beside it the highest-scored model with the same kind of station that one does, and the cheapest of the top 10.

Green is the best of these 3, also when they share the lead.

Price and ranking
	This model Dreame L40 Ultra Best on 3 facts	Cheapest of the top 10 eufy Omni E25 Best on 3 facts	Highest score here Narwal Freo 20 Best on 5 facts
Lowest price	–	$599Amazon.com best	$1,099Narwal (brand store)
Score			best
Rank	–	rank 6 of 65 with an all-in-one station	rank 1 of 65 with an all-in-one station
Customer rating	★ 4.1 · 1,859 reviews	★ 4.4 · 54,077 reviews best	★ 4.4 · 59 reviews best
Mopping
Mop type	spinning pads	roller mop	roller mop
Mop lift on carpet higher is better	0.4 in (10.5 mm) best	0.4 in (10.5 mm) best	0.4 in (10 mm)
Automatic mop detach	yes (best)	no	no
Washes the mop same on all	yes	yes	yes
Hot-air drying same on all	yes	yes	yes
Station
Station same on all	all-in-one station	all-in-one station	all-in-one station
Dust bag lasts longer is better	up to 75 days	up to 75 days	up to 120 days best
Plumbing hookup	yes (best)	no	–
Brush and obstacles
Anti-tangle brush same on all	yes	yes	yes
Obstacle avoidance same on all	AI camera	AI camera	AI camera
Climbs thresholds up to higher is better	0.9 in (22 mm)	0.8 in (21 mm)	1.6 in (40 mm) best
Climbing system for high thresholds same on all	no	no	no
Size, noise and age
Robot height lower is better	4.1 in (10.4 cm)	4.4 in (11.1 cm)	3.7 in (9.5 cm) best
Noise not judged	–	63 dB	–
On the market since	November 2024	December 2024	June 2026

Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.

What testers say about the Dreame L40 Ultra

The Dreame L40 Ultra is an all-in-one robot with two spinning mop pads that extend and swing, an extending side brush and camera-based obstacle recognition. The station empties the bin into a 3.2-liter bag, washes the pads in 149 °F water, dries them with hot air, doses cleaning solution and can be plumbed in; the pads stay behind in the station when the robot only vacuums. TechRadar names it the best robot for pet hair; Vacuum Wars calls it better than the pricier X40.

TechRadar tested it in a home full of pets and saw it pull more hair out of carpet than any other robot the reviewer had tried, without clogging the emptying mechanism; it also did well on hard floors and mopping muddy paw prints. Vacuum Wars measured the highest battery efficiency it had seen, roughly double the average, with a quoted run time of 194 minutes, and a dried-stain mopping score above average and above the X40. On carpet it lifted embedded sand at an above-average rate.

Both testers' criticism concerns the station: it is big and the styling is not for everyone. Beyond that, the robot is on the tall side at just over 3.9 inches, thresholds stop at a little over 0.8 inches and the quoted 11,000 Pa of suction is modest next to newer models. Compare its price with the newer L50 Pro Ultra too.

What the tests like and dislike about the Dreame L40 Ultra

Pros

Handles pet and human hair very well, helped by its hair-cutting brush TechRadar ↗
Side brush and one mop swing outward to reach right into corners TechRadar ↗
Maps rooms quickly and accurately, and rides over loose rugs without snagging TechRadar ↗
Clears debris from hard floors and carpet and cleans deep into carpet Vacuum Wars ↗
Very frugal battery, among the best they have seen for runtime per charge Vacuum Wars ↗
Mops dried stains well and can leave its pads in the dock for carpet runs Vacuum Wars ↗

Cons

The dock is very large and rather ugly TechRadar ↗
May push or ride over small soft items like gloves and toys TechRadar ↗
The app does not save a cleaning zone for later use TechRadar ↗
The standard brush tangles badly with long hair, the optional cutting brush fixes that Vacuum Wars ↗
The station squeaked a lot while washing the mop pads Vacuum Wars ↗
Kept missing a longer pile rug on the test floor Vacuum Wars ↗

Where the testers disagree

Pet hair: TechRadar: Handles pet and human hair very well, helped by its hair-cutting brush against Vacuum Wars: The standard brush tangles badly with long hair, the optional cutting brush fixes that
Navigation: TechRadar: Maps rooms quickly and accurately, and rides over loose rugs without snagging against Vacuum Wars: Kept missing a longer pile rug on the test floor

Each point sums up, in our words, the review of the test it names, and its link leads to that review. We do not summarize RTINGS or Wirecutter: their lists are linked above.

Dreame L40 Ultra specifications

The numbers that matter first, then every fact by group. As published by the maker or the store we read it from.

Dreame · on the market since November 2024

Robot height4.1 in

Climbs thresholds up to0.9 in

Mop lift on carpet0.4 in

Runtime per charge194 min

Suction power11,000 Pa

Consumables: a 3.2 l dust bag in the station, which lasts up to 75 days.

Dimensionsrobot and dock

From the published dimensions. The robot passes under furniture with 4.1 in of clearance or more.

Suction and brushes 5 facts

Suction power Suction in pascal, as the maker measures it. More pascal helps on carpet, but it says little about how well the robot picks grit off a hard floor.: 11,000 Pa
Anti-tangle brush
A brush that guides hair to the side instead of letting it wind around the shaft. It saves the cutting work in homes with long hair or pets. On this model: from the maker's product text, not from a specification table.: yes
Extending side brush The side brush swings out in a corner or along a baseboard, so the dust there is swept in too.: yes
Suitable for pet hair Whether the robot copes with pet hair: a brush that hair does not wind around and a dock that empties the bin for you. Where the maker does not say so itself, we read it from those two.: yes
Dirt detection A sensor notices where more dirt lies, at the doormat for example, and the robot cleans that patch longer or a second time.: yes

Mopping 5 facts

Mop type How the mop is built: flat pads, two spinning discs or a roller. Discs press harder on dried-on dirt, a roller rinses itself while it works.: spinning pads
Mop lift on carpet How far the robot lifts the mop when it drives onto a carpet. From about 0.4 in (10 mm) a medium pile stays dry.: 0.4 in (10.5 mm)
Mop extends to the edges The pad slides out along a wall or a baseboard, so the last few inches are mopped as well.: yes
Automatic mop detach The robot leaves the mop at the dock before it vacuums a carpet, so the carpet never gets wet.: yes
Mop refreshed while mopping The robot returns to the dock during a run to rinse the mop, instead of pushing dirty water around.: no

Dock 13 facts

Empties the dust bin
The dock empties the robot’s dust bin, usually after every run. You only empty the dock’s bag or bin. On this model: the bag sits in the station.: yes
Bagless The dock collects dust in a bin instead of a disposable bag. No bags to buy, but you empty it yourself.: no
Dust bag capacity How much the dust bag in the dock holds.: 3.2 l
Dust bag lasts
How long the maker says a dust bag lasts with daily use. With pets or a lot of carpet it is shorter. On this model: from the maker's product text, not from a specification table.: up to 75 days
Washes the mop
The dock washes the mop for you, so you do not rinse it by hand. On this model: from the maker's product text, not from a specification table.: yes
Wash temperature
How hot the dock washes the mop. Above 140 °F (60 °C) grease comes off, which is what keeps a mop from smelling. On this model: from the maker's product text, not from a specification table.: 149 °F (65 °C)
Dries the mop
The dock dries the mop afterwards, so it does not sit there wet and start to smell. On this model: from the maker's product text, not from a specification table.: yes
Hot-air drying
Drying is done with warm air instead of cold. It is faster and it helps against smell. On this model: from the maker's product text, not from a specification table.: yes
Dispenses detergent
The dock mixes detergent into the water itself, from its own bottle. On this model: from the maker's product text, not from a specification table.: yes
Plumbing hookup
The dock can be connected to the tap and the drain, so you never fill or empty a tank. It does need a connection nearby. On this model: from the maker's product text, not from a specification table.: yes
Clean water tank The clean water tank in the dock, which wets the mop.: 4.5 l
Dirty water tank The tank that catches the dirty water from the mop. You empty this one yourself.: 4 l
Dock width The width of the dock.: 13.4 in (34 cm)

Navigation and obstacles 6 facts

Navigation How the robot maps your home and follows that map. Lidar measures with a laser and works in the dark, a camera looks along and recognizes more.: LiDAR turret
Obstacle avoidance
How the robot sees loose things on the floor, such as cables, socks or a pet accident. A camera with depth sensing sees more than a bumper that reacts on contact. On this model: from the maker's product text, not from a specification table.: AI camera
Climbs thresholds up to The highest threshold the robot takes, as the maker states it. Measure your own: the step into a bathroom or onto a balcony is often higher.: 0.9 in (22 mm)
Climbing system for high thresholds
An extending leg or wheel that carries the robot over a high threshold. Without one it usually stops at about 0.8 in (2 cm). On this model: the maker names this feature nowhere on the product page, so we take it as no.: no
No-go zones How you keep the robot out of a place: a zone you draw in the app, a virtual wall or a magnetic strip on the floor.: zones in the app, virtual walls
Camera on board Whether the robot has a camera, and what for: to recognize obstacles, or also to show you a live picture of your home in the app.: obstacle camera

Robot 3 facts

Robot height How tall the robot is. It decides whether it fits under your sofa, bed or cabinet.: 4.1 in (10.4 cm)
Robot diameter How wide the robot is. Narrower gets between chair legs more easily, wider usually means a bigger dust bin.: 13.8 in (35 cm)
Dust bin in the robot How much dust the robot holds before you empty it. It matters less with a self-emptying dock, which empties the bin after every run.: 300 ml

Battery 2 facts

Battery capacity The capacity of the battery. It hints at the runtime, but how much the robot draws counts just as much.: 5,200 mAh
Runtime per charge
How long the robot cleans on one charge, at its quietest setting. After that it recharges and carries on where it stopped. On this model: from the maker's product text, not from a specification table.: 194 min

Smart features and warranty 3 facts

Matter
Matter is the standard that lets devices from different makers work together. With it you can run the robot outside the maker’s own app. On this model: the maker names this feature nowhere on the product page, so we take it as no.: no
Voice assistants
Which voice assistants the robot works with, such as Google Assistant or Alexa. On this model: from the maker's product text, not from a specification table.: Alexa, Google Assistant, Siri
Warranty The warranty the maker gives in the United States.: 2 years

Sources: nl.dreametech.com · Manual

Our score

Confidence: high. Two or more labs, or one lab and 300 or more owners’ ratings. The highest score today is 7.6.

Lab tests 60%6.8

5 cleaning abilities measured, on one scale for every robot.
- Deep clean on carpet6.2
- Pet hair8.1
- Mopping5.9
- Obstacle avoidance6.4
- Navigation7.8
Measured by Vacuum Wars (read on September 29, 2026).

Measured 6.9, counted 6.8: the fewer labs stand behind a result, the more we pull it toward the average of its station type.
Owners’ ratings 25%5.5

1,859 ratings, 4.1 stars on average, at Amazon.
Features 15%8.9

82 of 92 points for the facts the maker states.

Price never countsA sale can’t lift a model. Today’s lowest price sits beside the score, checked every morning.
No test, no rankOnly robots a lab has tested are ranked. The rest get a provisional score.
Reviewers beside, not insideReviewers’ picks are shown next to the score and do not count in it.

How we work this out →

The testers’ picks

TechRadar · Best for petsSeptember 25, 2026
Vacuum Wars · Position 44 of 151September 26, 2026

Positions and labels, never text. These picks are shown beside the score and do not count in it. How the score comes about is on the method page.

Frequently asked questions about the Dreame L40 Ultra

Does the Dreame L40 Ultra empty its own dust bin?

Yes. The station empties the robot’s dust bin after every run. The 3.2 l dust bag in the station lasts up to 75 days, the maker says.

Does the Dreame L40 Ultra wash and dry its own mop?

Yes. The station washes the mop itself, with water at 149 °F (65 °C). It then dries the mop with warm air.

Does the Dreame L40 Ultra work with Alexa, Google Home or Siri?

It works with Alexa, Google Assistant and Siri. It does not support Matter.

How high a threshold can the Dreame L40 Ultra climb?

Thresholds up to 0.9 in (22 mm), the maker says. It has no climbing system for higher thresholds. Measure your own thresholds: the ones to a bathroom or balcony are often higher.