The catch
Dreame L40 Ultra
A 97 mm robot fits under furniture that this 103.8 mm-tall model cannot get beneath.
Side by side
Dreame L40 Ultra vs Gen 2: Gen 2 only lifts its mops, while the original L40 removes them
Quick verdict
The original L40 Ultra is the one for automatic mop removal and camera-assisted obstacle recognition. The L40 Ultra Gen 2 is the one for a lower 97 mm body and updated cleaning hardware, provided lifted mops are enough for you. Gen 2 does not replace every original feature, especially when thick rugs make mop detachment important.
Before you buy
Why, and what it costs you
Gen 2 is 6.6% lower, though it is not smaller all around
You get 6.8 mm less height, and the body footprint stays the same 350 mm square.
Where this comes from
(103.8 - 97) / 103.8 × 100 = 6.55%. Leaving height aside, both published body dimensions are 350 × 350 mm.
The catch
Dreame L40 Ultra Gen 2
Gen 2 can't leave its mops at the dock on its own, which around thick rugs can matter more than its higher suction number.
Dreame L40 Ultra
- Why pick it
- Before vacuuming carpet, the mops have to be left at the dock.
- Camera-assisted obstacle recognition is on your list.
- The catch
- A 97 mm robot fits under furniture that this 103.8 mm-tall model cannot get beneath.
Dreame L40 Ultra Gen 2
- Why pick it
- The original 103.8 mm body is too tall for your furniture.
- A robot without a camera suits you, and lift and route settings can handle your rugs.
- The catch
- Gen 2 can't leave its mops at the dock on its own, which around thick rugs can matter more than its higher suction number.
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What this page compares
The L40 Ultra Gen 2 is lower and has a higher suction rating, while the original detaches its mops and uses a camera. Here are the practical trade-offs.
Which one fits
Pick the situations that sound like you
Automatic mop removal is needed
The detachment function you require is found only on the original.
- Dreame L40 Ultra
- Better fit
- Dreame L40 Ultra Gen 2
- Not suitable
Your furniture opening measures 100 mm
On paper Gen 2 fits, though the margin is very small.
- Dreame L40 Ultra
- Not suitable
- Dreame L40 Ultra Gen 2
- Caution
You want to avoid a navigation camera
Sensing on Gen 2 is structured-light and involves no camera.
- Dreame L40 Ultra
- Not suitable
- Dreame L40 Ultra Gen 2
- Better fit
You assume Gen 2 has all the original's features
Detachment and detergent equipment are not the same.
- Dreame L40 Ultra
- Good
- Dreame L40 Ultra Gen 2
- Caution
In practice
Differences you will notice
Gen 2 is 6.6% lower, though it is not smaller all around
You get 6.8 mm less height, and the body footprint stays the same 350 mm square.
How we worked this out
(103.8 - 97) / 103.8 × 100 = 6.55%. Leaving height aside, both published body dimensions are 350 × 350 mm.
Gen 2 has a narrow edge in a 100 mm opening
Gen 2 has 3 mm of nominal room. The original is too tall by 3.8 mm, though fitting Gen 2 still calls for careful measuring.
How we worked this out
100 - 97 = 3 mm and 103.8 - 100 = 3.8 mm. A nominal 3 mm margin may turn out too small once floor irregularities and fabric come into play.
For thick rugs, the older model can be the better one
Leaving its mops at the dock is something the original can do. Gen 2 needs a plan for its attached pads, even with its much higher suction rating.
How we worked this out
Mop detachment is supported on the original L40 Ultra and not on L40 Ultra Gen 2, so its 25,000 Pa rating does nothing about wet-pad separation.
Option A
Dreame, L40 Ultra
L40 Ultra
Homes that mix hard floors with rugs suit its extending side cleaning and removable mop pads. The original specification differs substantially from L40 Ultra Gen 2.
- Best for
- Dropping wet pads before it cleans carpet
Facts we checked
- Robot body of 350 × 350 × 103.8 mm
- Mop lift of 10.5 mm and automatic mop removal
- Tanks of 4.5 L for clean water and 4 L for used water
Option B
Dreame, L40 Ultra Gen 2
L40 Ultra Gen 2
Edges are covered by an extending side brush and mop, and the body is shorter than the original L40's. What the newer generation gives up is automatic mop removal.
- Best for
- Cleaning edges under moderately low furniture
Facts we checked
- Robot body of 350 × 350 × 97 mm
- No automatic mop removal, and a mop lift of 10.5 mm
- 5,200 mAh battery and suction rated at 25,000 Pa
Spec by spec
Where they really differ
| Spec | Dreame L40 Ultra | Dreame L40 Ultra Gen 2 | In practice |
|---|---|---|---|
| Body height | 103.8 mm | 97 mm | Gen 2 stands 6.8 mm shorter. |
| Body width and depth | 350 × 350 mm | 350 × 350 mm | A lower body is not a narrower one. |
| Mop removal | Automatic detachment | No automatic detachment | A real feature is lost for mop-free carpet runs. |
| Obstacle sensing | Camera-assisted | 3D structured light, no camera | Decide using room needs and your privacy preference. |
| Rated suction | 11,000 Pa | 25,000 Pa | A higher rating does not prove cleaning improves in proportion. |
| Detergent handling | Automatic system | Optional dispenser purchased separately | Look at what the exact Gen 2 package contains. |
Trade-offs
What each pick costs you
With Dreame L40 Ultra
- You buy the TriCut cutting brush separately if you want it, so don't assume each listing comes with it.
With Dreame L40 Ultra Gen 2
- You have to buy a dispenser module separately to get automatic detergent dosing.
Decision guide
How to decide
Check the floor plan before buying the suffix
Being lower is not automatically the newer model's most important improvement. Where thick rugs are common, leaving mops behind can matter more than a few millimeters of height. In a low-furniture apartment with mostly hard floors, it can go the other way.
The camera change is yours to weigh
Obstacles are handled in different ways by the original's camera-assisted system and Gen 2's structured-light approach. A household that avoids indoor cameras may welcome the change. If visual object recognition is what you specifically want, do not assume the newer model keeps it.
Compare the whole package
On the Amazon listing you picked, check the detergent equipment and the station configuration. An optional accessory is not the same as something included in the box. Buy for the routine you want on day one and not for a generic L40-family description.
What this page can’t tell you
- Specs from the manufacturer describe the hardware only. They are no substitute for a shared cleaning test and guarantee nothing about performance on every floor.
By the numbers
What the data shows
What we found across the robot vacuums we compare, plus the checked facts behind each finding.
How many fit
Only 9 of the 52 models checked meet every need here: “I want my carpet to stay dry”, “I care about mopping as much as vacuuming”, and “It has to get under my low furniture”.
9 models fit, out of 52 checkedShow the facts and the math
How we countedThe count uses each product's current fit ratings for “I want my carpet to stay dry”, “I care about mopping as much as vacuuming”, and “It has to get under my low furniture”. A need with no documented match is not counted.
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Dreame L40 Ultra |
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| Dreame L40 Ultra Gen 2 |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Dreame L40 Ultra
Before vacuuming carpet, the mops have to be left at the dock.
See price & reviews on AmazonDreame L40 Ultra Gen 2
The original 103.8 mm body is too tall for your furniture.
See price & reviews on AmazonEach link opens in a new tab.
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