The catch
Dreame L10s Ultra Gen 2
For thick rugs, a 10.5 mm mop lift is no substitute for automatic mop detachment.
Side by side
Dreame L10s Ultra Gen 2 vs L40 Ultra Gen 2 compared: Neither detaches mops, and L40 extends its side brush
Quick verdict
The L40 Ultra Gen 2 is the pick if its extending side brush deals with debris that gets missed around edges and furniture legs. The L10s Ultra Gen 2 is the pick when extending-mop cleaning is mostly what you want, at a better price. Each has a 350 mm square body, roughly 97 mm height and a 10.5 mm mop lift, and neither offers automatic mop detachment.
Before you buy
Why, and what it costs you
Both bodies have identical footprints
Each takes up a 350 × 350 mm body envelope. A slightly lower rounded height does not make L40 a smaller robot.
Where this comes from
350 × 350 = 122,500 mm² for each published body footprint. A protruding brush and operating clearance are left out.
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 L10s Ultra Gen 2
- Why pick it
- You want extending-mop cleaning and don't want to pay for the extra edge-brush mechanism.
- A mostly open hard-floor layout suits the simpler Gen 2 package.
- The catch
- For thick rugs, a 10.5 mm mop lift is no substitute for automatic mop detachment.
Dreame L40 Ultra Gen 2
- Why pick it
- You keep finding debris next to furniture legs and edges.
- The extending side brush matters to you as much as the extending mop.
- 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.
We may earn a commission from qualifying Amazon purchases. How we make money
What this page compares
With about 97 mm of height and the same body footprint, the Gen 2 robots are close. Compare edge-brush reach, mop care and the differences that suction numbers hide.
Which one fits
Pick the situations that sound like you
You need a robot that is noticeably lower
The stated heights differ by a negligible amount.
- Dreame L10s Ultra Gen 2
- Similar
- Dreame L40 Ultra Gen 2
- Similar
Dry debris builds up next to furniture legs
The side brush extends on the L40.
- Dreame L10s Ultra Gen 2
- Good
- Dreame L40 Ultra Gen 2
- Better fit
You mostly want mopping that reaches edges
An extending mop comes on each.
- Dreame L10s Ultra Gen 2
- Good
- Dreame L40 Ultra Gen 2
- Good
Automatic mop removal is required
Not supported by either.
- Dreame L10s Ultra Gen 2
- Not suitable
- Dreame L40 Ultra Gen 2
- Not suitable
In practice
Differences you will notice
Both bodies have identical footprints
Each takes up a 350 × 350 mm body envelope. A slightly lower rounded height does not make L40 a smaller robot.
How we worked this out
350 × 350 = 122,500 mm² for each published body footprint. A protruding brush and operating clearance are left out.
Height differs by just 0.2 mm
When planning furniture access, count these robots as the same height. For a tight opening, the practical margin has to be much larger than that.
How we worked this out
97.2 - 97 = 0.2 mm. The precision of the manufacturer's dimensions does not support claiming a meaningful real-world clearance advantage.
The upgrade that stands out is the edge brush
A mop extends on both already. L40 also extends its side brush, which changes how far it reaches dry debris before the mop passes.
How we worked this out
MopExtend appears in the L10s Gen 2 specification. Alongside its extending mop, L40 Gen 2 adds an extending side brush.
Option A
Dreame, L10s Ultra Gen 2
L10s Ultra Gen 2
The body stands just under 3.83 inches tall, and an extending mop and wash-and-dry dock take care of routine hard-floor cleaning.
- Best for
- Floor care on autopilot beneath furniture with a four-inch gap
Facts we checked
- Robot body of 350 × 350 × 97.2 mm
- Threshold rating of 20 mm and mop lift of 10.5 mm
- 5,200 mAh battery and a 10,000 Pa suction specification
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 L10s Ultra Gen 2 | Dreame L40 Ultra Gen 2 | In practice |
|---|---|---|---|
| Body width and depth | 350 × 350 mm | 350 × 350 mm | In a tight passage, neither is the narrower one. |
| Body height | 97.2 mm | 97 mm | A clearance advantage of 0.2 mm is not a useful one. |
| Mop lift | 10.5 mm | 10.5 mm | On this specification, rug planning comes out the same. |
| Edge hardware | Extending mop, fixed-position side brush | Extending mop and side brush | For dry debris, L40 adds brush reach outward. |
| Automatic mop detachment | No | No | The pads stay attached on both. |
| Rated suction | 10,000 Pa | 25,000 Pa | A ratio of ratings is no ratio of pickup performance. |
Trade-offs
What each pick costs you
With Dreame L10s Ultra Gen 2
- L10s Pro Ultra Heat supplies a heated wash, which this mop washing is not. Warm-air drying is a separate function.
With Dreame L40 Ultra Gen 2
- You have to buy a dispenser module separately to get automatic detergent dosing.
Decision guide
How to decide
Edge brushing and edge mopping are different jobs
Near a cabinet, an extending mop wets a strip, while an extending side brush can sweep dry debris from that area toward the vacuum path. When crumbs and grit are the problem and not the wet-cleaning strip, L40's extra mechanism is the more relevant difference.
Don't choose over a fraction of a millimeter
Published heights are 0.2 mm apart, and floor joints, furniture fabric and measurement tolerances matter more than that. If the L10s cannot comfortably enter a space, do not assume the L40 will manage it.
Settle the mop routine before you choose on power
Pads stay attached and lift on both, rather than being left at the station, and a higher suction rating does not alter that physical arrangement. If thick rugs must stay dry, pick suitable route settings or compare a model with automatic mop removal.
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 care about mopping as much as vacuuming”, “Edges and corners are what bug me”, and “It has to get under my low furniture”.
9 models fit, out of 52 checkedThe gap in numbers
Dreame L40 Ultra Gen 2 lists 25,000 Pa for suction rating, 150% more than the 10,000 Pa on Dreame L10s Ultra Gen 2.
- Dreame L10s Ultra Gen 2
- 10,000 Pa
- Dreame L40 Ultra Gen 2
- 25,000 Pa
- Models with this figure
- 34 of 52
Show the facts and the math
How we countedThe count uses each product's current fit ratings for “I care about mopping as much as vacuuming”, “Edges and corners are what bug me”, and “It has to get under my low furniture”. A need with no documented match is not counted.
How we calculatedThese are the pascal ratings makers publish. Brush design, airflow and software still affect how well a robot cleans. For context, 34 of 52 models publish comparable figures.
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Dreame L10s Ultra Gen 2 |
|
|
|
| Dreame L40 Ultra Gen 2 |
|
|
|
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 L10s Ultra Gen 2
You want extending-mop cleaning and don't want to pay for the extra edge-brush mechanism.
See price & reviews on AmazonDreame L40 Ultra Gen 2
You keep finding debris next to furniture legs and edges.
See price & reviews on AmazonEach link opens in a new tab.
We may earn a commission from qualifying Amazon purchases. How we make money