Dreame L40s Ultra
No shop we follow delivers this model to Germany. This page says what it can do, and which similar robots you can buy here.
Test sites that tested it
Which robot is right for your home? Find out in 7 questions →
Before you buy, compare it with 2 recommended alternatives
No shop 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.
| This model Dreame L40s Ultra Best on 5 facts | Cheapest of the top 10 MOVA S70 Roller Best on 2 facts | Highest score here Roborock Saros 20 Flow Best on 6 facts | |
|---|---|---|---|
| Price and ranking | |||
| The lowest price today at a shop that delivers to you, delivery included. A price with an asterisk comes from a shop abroad, and its delivery cost is our own estimate. Lowest price | – | 399 €Amazon.de best | 1,299 €Roborock (brand store) |
| Our own score out of 10: 60% test-site results, 25% shop ratings and 15% the maker’s facts. Price does not count. Score | not in our ranking | best | |
| The test sites that have tested this model, each linked to its own review. Tests | Vacuum Wars | Just A Dad Approved | Just A Dad Approved |
| Where the model stands in our ranking, among the robots with the same kind of station. Rank | – | rank 3 of 65 with an all-in-one station | rank 1 of 65 with an all-in-one station |
| The average of the stars buyers give at the shops, with the number of reviews behind it. We only compare it from 20 reviews. Customer rating | – | – | – |
| Mopping | |||
| 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. When it matters
Source
| spinning pads | roller mop | roller mop |
| How far the robot lifts the mop when it drives onto a carpet. From about 10 mm a medium pile stays dry. In this comparisonWhen it matters
Source
| 10.5 mm | 12 mm | 15 mm best |
| The robot leaves the mop at the dock before it vacuums a carpet, so the carpet never gets wet. When it matters
Source
| yes (best) | no (assumed) | no |
| The dock washes the mop for you, so you do not rinse it by hand. When it matters
Source
| yes | yes | yes |
| Drying is done with warm air instead of cold. It is faster and it helps against smell. When it matters
Source
| yes | yes | yes |
| Station | |||
| The station the robot returns to, and what it does by itself, such as emptying the bin or washing and drying the mops. Station same on all | all-in-one station | all-in-one station | all-in-one station |
| How long the maker says a dust bag lasts with daily use. With pets or a lot of carpet it is shorter. In this comparisonWhen it matters
Source
| up to 100 days best | up to 100 days best | up to 65 days |
| 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. When it matters
Source
| yes (best) | no | no (assumed) |
| Brush and obstacles | |||
| 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. When it matters
Source
| yes (best) | no (assumed) | yes (best) |
| 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. When it matters
Source
| 3D sensor (structured light) | AI camera | AI camera |
| 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. In this comparisonWhen it matters
Source
| 22 mm | 22 mm | 45 mm best |
| An extending leg or wheel that carries the robot over a high threshold. Without one it usually stops at about 2 cm. When it matters
Source
| yes (best) | no (assumed) | yes (best) |
| Size, noise and age | |||
| How tall the robot is. It decides whether it fits under your sofa, bed or cabinet. In this comparisonWhen it matters
Source
| 9.7 cm | 9 cm | 9 cm best |
| The noise in decibels, in the setting its source names: makers mostly give the standard setting, shops often the highest. 65 dB is like a vacuum at half power, 55 dB like a conversation. When it matters
Source
| – | 73 dB | – |
| The month the model first went on sale. It shows how old the technology in it is. On the market since | August 2025 | February 2026 | September 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 the tests like and dislike about the Dreame L40s Ultra
Pros
- Among the strongest robots tested at deep cleaning carpet Vacuum Wars ↗
- Dual rubber brush kept long hair completely untangled Vacuum Wars ↗
- Extending side brush clearly improved dirt removal from corners Vacuum Wars ↗
Cons
- Among the weakest scores on record at avoiding obstacles Vacuum Wars ↗
- Cheaper AE version avoids obstacles far better and scored higher overall Vacuum Wars ↗
- Advertised threshold climbing is nothing special, many robots cross the same Vacuum Wars ↗
Each point sums up, in our words, the review of the test it names, and its link leads to that review. We do not summarise RTINGS or Wirecutter: their lists are linked above.
Dreame L40s Ultra specifications
The numbers that matter first, then every fact by group. As published by the maker or the shop we read it from.
Dreame · on the market since August 2025
Consumables: a 3.2 l dust bag in the station, which lasts up to 100 days.
Dimensionsrobot and dock
From the published dimensions. The robot passes under furniture with 10 cm of clearance or more. The dock needs a spot 34 cm wide and 46 cm deep.
Suction and brushes 6 facts
- Suction power
Among the models we track
19,000 Pa on this model
Lowest
450 Pa Highest
42,000 Pa Middle
6,000 PaHigher than 754 of the 922 models we track.
When it matters
- Deep-pile carpet and rugs, where dust sinks in.
- Pet hair, sand and crumbs trodden into fibres.
- On hard floors the gain from a higher figure is small: the dust lies on top.
Source: dreametech.com · checked on 26 Sept
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.
- 19,000 Pa
- Anti-tangle brush
482 of the 502 models we track have this.
When it matters
- Long hair and pet hair, which wrap around a bristle brush.
- Homes where you would rather not cut hair off the brush.
- Short hair and few pets hardly tangle anyway.
Source: dreametech.com · checked on 26 Sept
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.
- yes
- Extending side brush
When it matters
- Corners and edges along kickboards, where a round robot leaves a strip of dust.
- Rooms with many walls and furniture edges.
- In open rooms with few corners it adds little.
Source: dreametech.com · checked on 26 Sept
The side brush swings out in a corner or along a kickboard, so the dust there is swept in too.
- yes
- Carpet detection
When it matters
- Rugs and carpets, where the robot should raise its suction.
- Mopping in a home with rugs, which have to stay dry.
- Without carpets or rugs it has nothing to detect.
Source: dreametech.com · checked on 2 Oct
The robot notices when it drives onto a carpet. Most then raise their suction, and a mopping robot lifts its mop or leaves it at the dock.
- detects carpet
- Suitable for pet hair
When it matters
- Dogs and cats that shed.
- Long-haired pets, whose hair wraps around a brush.
- Without pets, ordinary hair and dust need nothing special.
Source: derived, no source of its own · checked on 2 Oct
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
When it matters
- Entrances and kitchens, where dirt gathers in one place.
- Pets that leave hair in a favourite spot.
- If dirt is spread evenly, a normal pass cleans it just as well.
Source: dreametech.com · checked on 2 Oct
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 4 facts
- Mop type
When it matters
- Homes with a lot of hard floor that you want mopped, not just wiped.
- Dried-on dirt in a kitchen, which spinning pads or a roller scrub off better than a dragged cloth.
- If you only vacuum, the mop’s build decides nothing.
Source: dreametech.com · checked on 26 Sept
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
Among the models we track
10.5 mm on this model
Lowest
5 mm Highest
30 mm Middle
10.5 mmHigher than 138 of the 286 models we track.
When it matters
- Homes with rugs and hard floors side by side.
- Mopping without the robot leaving the rugs damp.
- Without rugs the mop never has to lift.
Source: dreametech.com · checked on 26 Sept
How far the robot lifts the mop when it drives onto a carpet. From about 10 mm a medium pile stays dry.
- 10.5 mm
- Mop extends to the edges
When it matters
- Kitchens and hallways where dirt gathers along the kickboard.
- Homes with many corners and table legs.
- In open rooms the strip it leaves along the wall is small.
Source: dreametech.com · checked on 26 Sept
The pad slides out along a wall or a kickboard, so the last few centimetres are mopped as well.
- yes
- Automatic mop detach
51 of the 108 models we track have this.
When it matters
- Homes with carpets or rugs that should stay dry.
- High-pile rugs that no mop lift clears.
- Without carpets the mop can stay on.
Source: dreametech.com · checked on 26 Sept
The robot leaves the mop at the dock before it vacuums a carpet, so the carpet never gets wet.
- yes
Dock 13 facts
- Empties the dust bin
When it matters
- Pets, sand or a large home, which fill the bin every run.
- Dust allergy, since you rarely touch the dust yourself.
- In a small home with little dust, emptying the bin by hand takes a moment.
Source: dreametech.com · checked on 26 Sept
The dock empties the robot’s dust bin, usually after every run. You only empty the dock’s bag or bin.
- yes
- Bagless
When it matters
- Not wanting to buy bags again and again.
- Pets, whose hair fills a bag quickly.
- With a dust allergy a sealed bag keeps the dust in when you throw it away, so bagless is no gain.
Source: dreametech.com · checked on 26 Sept
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
Source: dreametech.com · checked on 26 Sept
How much the dust bag in the dock holds.
- 3.2 l
- Dust bag lasts
Among the models we track
up to 100 days on this model
Lowest
up to 30 days Highest
up to 180 days Middle
up to 70 daysHigher than 381 of the 460 models we track.
When it matters
- Pets or a lot of carpet, which fill a bag faster than the maker’s figure.
- Counting what bags cost in a year.
- With a bagless dock there is no bag to replace.
Source: dreametech.com · checked on 26 Sept
How long the maker says a dust bag lasts with daily use. With pets or a lot of carpet it is shorter.
- up to 100 days
- Washes the mop
303 of the 384 models we track have this.
When it matters
- Mopping several times a week, when rinsing pads by hand gets tiresome.
- Kitchens and hallways, where a mop picks up a lot of dirt.
- If you rarely mop, washing the pads by hand is little work.
Source: dreametech.com · checked on 26 Sept
The dock washes the mop for you, so you do not rinse it by hand.
- yes
- Wash temperature
Among the models we track
75 °C on this model
Lowest
55 °C Highest
100 °C Middle
75 °CLower than 65 of the 174 models we track.
When it matters
- Kitchens with grease and sticky spills.
- Pets, where a hot wash keeps the mop from smelling.
- For light dust on a living room floor a cold wash will do.
Source: dreametech.com · checked on 26 Sept
How hot the dock washes the mop. Above 60 °C grease comes off, which is what keeps a mop from smelling.
- 75 °C
- Dries the mop
When it matters
- Mopping often, since a damp mop in the dock starts to smell.
- Humid rooms, where a mop dries slowly.
- If you take the pads off and wash them yourself, you will not miss it.
Source: dreametech.com · checked on 26 Sept
The dock dries the mop afterwards, so it does not sit there wet and start to smell.
- yes
- Hot-air drying
246 of the 296 models we track have this.
When it matters
- Mopping daily, when the mop barely dries before the next run.
- A smell from the dock in a warm or humid home.
- If you mop only now and then, cold air dries the mop in time.
Source: dreametech.com · checked on 26 Sept
Drying is done with warm air instead of cold. It is faster and it helps against smell.
- yes
- Dispenses detergent
When it matters
- Kitchens and greasy floors, where water alone leaves a film.
- Not wanting to add cleaner by hand each time.
- Some floors, such as oiled wood, are best mopped with water only, so there it adds nothing.
Source: dreametech.com · checked on 26 Sept
The dock mixes detergent into the water itself, from its own bottle.
- yes
- Plumbing hookup
61 of the 154 models we track have this.
When it matters
- Mopping every day, without filling and emptying tanks.
- A spot near a tap and a drain, such as a utility room or under a kitchen counter.
- If the dock stands far from any plumbing, it is no use.
Source: dreametech.com · checked on 26 Sept
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.
- yes
- Clean water tank
When it matters
- Large hard floors mopped every day.
- Being away for days while the robot keeps mopping.
- With a dock connected to the tap the tank is filled for you.
Source: dreametech.com · checked on 26 Sept
The clean water tank in the dock, which wets the mop.
- 4.5 l
- Dirty water tank
When it matters
- Mopping every day across a large hard floor.
- Kitchens, where the water gets dirty fast and smells if it stands.
- With a dock connected to the drain you never empty it.
Source: dreametech.com · checked on 26 Sept
The tank that catches the dirty water from the mop. You empty this one yourself.
- 4 l
- Dock size (w × d × h)
When it matters
- A small hallway or a niche where the dock has to fit.
- Placing the dock under a cabinet or a counter.
- Along an open wall with room to spare it decides little.
Source: dreametech.com · checked on 3 Oct
The width, depth and height of the dock. Measure the spot you have in mind, and leave room for the lid and for the robot driving in.
- 34 × 45.7 × 59 cm
Navigation and obstacles 7 facts
- Navigation
When it matters
- Several rooms, where a map lets you send the robot to one of them.
- Cleaning in the dark, which lidar does and a camera alone does not.
- In one open room even simple navigation covers the floor.
Source: dreametech.com · checked on 29 Sept
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 recognises more.
- LiDAR turret
- Obstacle avoidance
When it matters
- Cables, socks and toys left on the floor.
- Pets, whose accidents a robot should steer around.
- In a home that is tidied before each run it matters less.
Source: dreametech.com · checked on 26 Sept
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.
- 3D sensor (structured light)
- Climbs thresholds up to
Among the models we track
22 mm on this model
Lowest
3 mm Highest
60 mm Middle
20 mmHigher than 784 of the 918 models we track.
When it matters
- Door sills and raised strips between rooms.
- Thick rugs whose edge the robot has to climb.
- In a flat home with no sills it decides nothing.
Source: dreametech.com · checked on 26 Sept
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.
- 22 mm
- Climbing system for high thresholds
64 of the 117 models we track have this.
When it matters
- Door sills higher than most robots can take.
- Thick rugs and raised doorsteps between rooms.
- In a home without sills it decides nothing.
Source: dreametech.com · checked on 10 Oct
An extending leg or wheel that carries the robot over a high threshold. Without one it usually stops at about 2 cm.
- yes
- Room-by-room cleaning
When it matters
- Cleaning only the kitchen after dinner or the hallway after a rainy day.
- Rooms that need more passes than others.
- If you always clean the whole home, you will rarely use it.
Source: dreametech.com · checked on 2 Oct
You pick one or more rooms on the map in the app, and the robot cleans only those.
- yes
- Recharge and resume
When it matters
- Large homes the robot cannot finish on one charge.
- Carpets, which drain the battery faster.
- In a small home the robot finishes before it needs to charge.
Source: dreametech.com · checked on 2 Oct
When the battery runs low in the middle of a run, the robot recharges and then carries on where it stopped.
- yes
- Stair-edge sensors
When it matters
- Homes with stairs or a step down into a room.
- A landing or a split-level floor.
- In a home on one level with no drops it has nothing to guard.
Source: Manual · checked on 5 Oct
Sensors under the robot that see a drop, so it stops at the top of a staircase instead of falling down it.
- yes
Robot 4 facts
- Robot height
Among the models we track
9.7 cm on this model
Lowest
5.6 cm Highest
20.4 cm Middle
9.5 cmHigher than 620 of the 1023 models we track.
When it matters
- Sofas, beds and cabinets with little room underneath.
- Dust that gathers under furniture you never move.
- With furniture on high legs or flat on the floor it decides nothing.
Source: dreametech.com · checked on 26 Sept
How tall the robot is. It decides whether it fits under your sofa, bed or cabinet.
- 9.7 cm
- Robot diameter
When it matters
- Dining chairs and tables with legs close together.
- Narrow gaps between furniture and walls.
- In a room with little furniture the robot’s width decides little.
Source: dreametech.com · checked on 5 Oct
How wide the robot is. Narrower gets between chair legs more easily, wider usually means a bigger dust bin.
- 35 cm
- Robot weight
When it matters
- Carrying the robot up and down the stairs to clean another floor.
- A home on several floors with one robot for all of them.
- If it stays on one floor, its weight does not matter.
Source: dreametech.com · checked on 5 Oct
What the robot weighs. It counts most if you carry it up a staircase every day.
- 4.1 kg
- Dust bin in the robot
When it matters
- A robot without an auto-empty dock, which you empty by hand.
- Pets and long hair, which fill a small bin within one run.
- With an auto-empty dock the bin is emptied after every run, so its size hardly matters.
Source: dreametech.com · checked on 26 Sept
How much dust the robot holds before you empty it. It matters less with an auto-empty dock, which empties the bin after every run.
- 310 ml
Battery 3 facts
- Battery capacity
Source: dreametech.com · checked on 26 Sept
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
Among the models we track
220 min on this model
Lowest
45 min Highest
360 min Middle
150 minHigher than 812 of the 1011 models we track.
When it matters
- Large homes or several floors cleaned in one go.
- Carpet, where the robot uses more power.
- In a small home most robots finish well before the battery runs low.
Source: dreametech.com · checked on 26 Sept
How long the robot cleans on one charge, at its quietest setting. After that it recharges and carries on where it stopped.
- 220 min
- Charging time
When it matters
- Large homes, where the robot recharges in the middle of a run.
- Running several times a day.
- If it runs once a day, it has hours to charge.
Source: Manual · checked on 5 Oct
How long an empty battery takes to charge fully in the dock.
- 3.5 h
Smart features and warranty 2 facts
- Voice assistants
When it matters
- Starting the robot by voice while your hands are full.
- A home already run with Alexa, Google or Siri.
- If you start it from the app or a schedule, you will not miss it.
Source: amazon.com · checked on 5 Oct
Which voice assistants the robot works with, such as Google Assistant or Alexa.
- Alexa, Google Assistant
- Scheduled runs
When it matters
- Cleaning while you are at work or asleep.
- A fixed routine, such as the kitchen after every dinner.
- If you start it by hand each time, you will not miss it.
Source: Manual · checked on 5 Oct
You set days and times, and the robot starts by itself, also when you are not at home.
- yes
Sources: dreametech.com · Manual · amazon.com
Frequently asked questions about the Dreame L40s Ultra
Does the Dreame L40s 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 100 days, the maker says.
Does the Dreame L40s Ultra wash and dry its own mop?
Yes. The station washes the mop itself, with water at 75 °C. It then dries the mop with warm air.
Does the Dreame L40s Ultra work with Alexa, Google Home or Siri?
It works with Alexa and Google Assistant.
How high a threshold can the Dreame L40s Ultra climb?
Thresholds up to 22 mm, the maker says. It has a climbing system for higher thresholds. Measure your own thresholds: the ones to a bathroom or balcony are often higher.
Does the Dreame L40s Ultra fit under low furniture?
The robot is 9.7 cm tall, so it fits under furniture with at least 10 cm of clearance.
Is the Dreame L40s Ultra suitable for pet hair?
Yes, the maker says. The brush guides hair to the side instead of winding it round the roller.
The maker
Dreame
- Reviews on Trustpilot
- Headquarters: China
- Founded in 2017
Dreame Technology makes robot vacuums and mops, cordless stick vacuums, wet and dry vacuums and hair dryers. Its founder, Yu Hao, started the business in 2015 with work on high-speed digital motors, and its headquarters and factory are in Suzhou, China. At the end of 2017 Dreame joined Xiaomi's ecosystem of partner companies.