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- Vacuum Wars ↗Position 65 of 151
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What the tests like and dislike about the Dreame X40 Ultra
Pros
- Pulled deeply embedded sand from carpet far better than most robots Vacuum Wars ↗
- Spinning mops lifted dried coffee and juice stains very well Vacuum Wars ↗
- Avoided the test obstacles almost without fault Vacuum Wars ↗
- Spotted cables, shoes and pet mess and kept well clear of them TechRadar ↗
- Scrubbed away dried sauce and sticky honey within a few passes TechRadar ↗
- Extending brush and mop reach into corners and along cabinet edges TechRadar ↗
Cons
- Long hair still tends to tangle around the main brush Vacuum Wars ↗
- One of the priciest robots the testers had evaluated at the time Vacuum Wars ↗
- Weak dock suction sometimes left the bin full and clogged the bag TechRadar ↗
- App buries common settings deep in menus and can lag TechRadar ↗
- Dust bags fill early, which pushes up running costs TechRadar ↗
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 X40 Ultra specifications
The numbers that matter first, then every fact by group. As published by the maker or the store we read it from.
Consumables: a 3.2 l dust bag in the station, which lasts up to 75 days.
Suction and brushes 2 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.
- 12,000 Pa
- Extending side brush
The side brush swings out in a corner or along a baseboard, so the dust there is swept in too.
- yes
Mopping 3 facts
- 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
Dock 12 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.
- 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.
- up to 75 days
- Washes the mop
The dock washes the mop for you, so you do not rinse it by hand.
- 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.
- 158 °F (70 °C)
- Dries the mop
The dock dries the mop afterwards, so it does not sit there wet and start to smell.
- yes
- Hot-air drying
Drying is done with warm air instead of cold. It is faster and it helps against smell.
- yes
- Dispenses detergent
The dock mixes detergent into the water itself, from its own bottle.
- 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.
- no
- 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
Navigation and obstacles 2 facts
- 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.
- 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)
Robot 1 fact
- 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 1 fact
- Battery capacity
The capacity of the battery. It hints at the runtime, but how much the robot draws counts just as much.
- 6,400 mAh
Smart features and warranty 1 fact
- Voice assistants
Which voice assistants the robot works with, such as Google Assistant or Alexa.
- Alexa, Google Assistant, Siri
Sources: dreametech.com · amazon.com
What the tests say
- Vacuum Wars · Position 65 of 151September 26, 2026
Positions and labels, never text. How we combine those positions is on the method page.
