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Roborock S8 MaxV Ultra vs Dreame X40 Master – Battle of the Plumbots

Welcome to Vacuum Wars, where we are taking an in-depth look at two of the most advanced robot vacuum mop combos on the market: the Roborock S8 MaxV Ultra and the Dreame X40 Master. Both of these “plumbots” boast plumbing-integrated water refill and drainage systems, so that we don’t have to refill clean water tanks or empty dirty water tanks, ultimately bringing us closer to fully automated floor care. We bought both of these models and over the past few weeks, we’ve tested both of them extensively. Let’s dive into the results and see which one came out on top.

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Dreame X40 Master


The Dreame X40 Master is a high-end robot vacuum and mop combo equipped with advanced automatic refilling and draining capabilities via an 8-in-1 hands-free base station that connects to the home’s plumbing. This multifunctional hub streamlines maintenance by managing water, self-cleaning, self-drying, and self-emptying tasks. Designed with a sleek, low-profile build at just 11 inches tall, the base station is crafted to blend seamlessly into modern home environments. In our in-studio evaluations, the X40 Master delivered excellent overall performance, particularly standing out in navigation efficiency and battery life. See additional info

$1,599.99 $1,999.99

Price as of Amazon price as of February 17, 2025

Auto Empty Station: Self Empties Debris | Washes Mop Pad | Washes Mop Pad with Hot Water | Dries Mop Pad | Dries Mops Pad with Heated Air| Self Cleaning | Dirty Water Sensor | Plumbing Option

Mopping: Lifts Mop Pads on Carpets | Extending Mop Pad for Hard to Reach Areas | Can Leave Pads at Base while Vacuuming

Hardware: Auto Extending Side Brush for Hard to Reach Areas | 22mm Threshold Crossing

Performance: Carpet Boost Settings

Mapping / Navigation: Multi Level Maps | Virtual Barriers and No Go Zones

Obstacle Avoidance: 120 Objects Recognized

Pet Features: Live Video Monitoring | Pet Checkup or Similar

ScoresDreame X40 MasterAverage Robot Vacuum Tested
Vacuum Wars Overall4.69

3.40

Features4.45

4.01

Mopping Performance4.75

4.01

Obstacle Avoidance4.69

3.30

Pet3.98

3.60

Navigation4.55

3.26

Battery4.37

2.70

Performance4.19

3.40

Official Battery Life: 198 MinutesNavigation Type: Spinning Lidar
Official Suction Power: 12000 PaDust Bin Size: 350ml
Obstacle Avoidance Type: Single Camera & 3D Structured LightObjects Recognized: 120
Multi Level Maps: YVirtual Barriers: Y
Detergent Capacity: UnknownDisposable Bag: 3.2L

Roborock S8 MaxV Plumbot


The Roborock S8 MaxV Ultra is an advanced robot vacuum mop combo featuring the upgraded RockDock Ultra docking station, which uniquely offers an automated refill and drainage system not available in other versions. The dock empties the dustbin, washes and dries the mop pad with hot water and air, refills the water tank, and includes an auto detergent dispenser—minimizing manual maintenance. It provides 10,000 Pa suction, a VibraRise 3.0 mopping system with dual lifting pads to avoid wetting carpets, and a FlexiArm side brush for edge cleaning. Intelligent navigation uses PreciSense LiDAR and a front camera for Reactive 3D Obstacle Avoidance, enabling pet care features like targeted cleaning, monitoring, and video calls via the app. See additional info

$1,899.99

Price as of Amazon price as of February 17, 2025

Auto Empty Station: Self Empties Debris | Washes Mop Pad | Washes Mop Pad with Hot Water | Dries Mop Pad | Dries Mops Pad with Heated Air| Self Cleaning | Dirty Water Sensor | Plumbing Option

Mopping: Lifts Mop Pads on Carpets | Extending Mop Pad for Hard to Reach Areas

Hardware: Auto Extending Side Brush for Hard to Reach Areas | 20mm Threshold Crossing

Performance: Carpet Boost Settings

Mapping / Navigation: Multi Level Maps | Virtual Barriers and No Go Zones

Obstacle Avoidance: 73 Objects Recognized

Pet Features: Live Video Monitoring | Pet Checkup or Similar

Controls: Virtual Assistant Options

ScoresRoborock S8 MaxV PlumbotAverage Robot Vacuum Tested
Vacuum Wars Overall4.42

3.40

Features4.68

4.01

Mopping Performance5.16

4.01

Obstacle Avoidance3.41

3.30

Pet3.75

3.60

Navigation3.75

3.26

Battery2.86

2.70

Performance3.46

3.40

Official Battery Life: 180 MinutesNavigation Type: Spinning Lidar
Official Suction Power: 10000 PaDust Bin Size: 470ml
Obstacle Avoidance Type: 3D Structured light & Single CameraObjects Recognized: 73
Multi Level Maps: YVirtual Barriers: Y
Detergent Capacity: 580mlDisposable Bag: 2.5L

Hardware and Suction

Looking first at their hardware, the Dreame X40 Master uses a single roller while the Roborock features a dual brush roller system. Both have automatically extending side brushes, which we found to actually improve corner coverage.

Dreame X40 Master and Roborock S8 MaxV Ultra robot vacuums hardware
Dreame X40 Master (left) and Roborock S8 MaxV Ultra (right) robot vacuums’ brush rolls, sidebrushes and mop pads. ©Vacuum Wars

In terms of suction power, the Dreame X40 Master leads with 12,000 Pascals compared to the Roborock’s 10,000 Pascals, so it was no surprise in our suction and airflow tests that the Dreame X40 offers more raw power.

Dreame X40 Master and Roborock S8 MaxV Ultra power scores
Roborock S8 MaxV Ultra and Dreame X40 Master power scores. ©Vacuum Wars
Dreame X40 Master and Roborock S8 MaxV Ultra suction and airflow testing
Dreame X40 Master and Roborock S8 MaxV Ultra suction and airflow testing in our studio. ©Vacuum Wars

Vacuuming

When cleaning hard floors and carpets, both models excelled in picking up various sizes of debris without any issues.

Dreame X40 Master and Roborock S8 MaxV Ultra picking up debris.
Roborock S8 MaxV Ultra (left) and Dreame X40 Master (right) picking up debris of various shapes and sizes at out studio. ©Vacuum Wars

However, in our Carpet Deep Clean test, which we test by embedding sand in carpets and weighing their dustbins after a timed run, the Dreame outperformed the Roborock, removing more embedded sand in our tests.

Dreame X40 Master and Roborock S8 MaxV Ultra Carpet Deep Clean Test
Dreame X40 Master and Roborock S8 MaxV Ultra Carpet Deep Clean Test ©Vacuum Wars

Additionally, the Dreame’s single roller resisted pet hair tangles better than Roborock’s dual rollers, with only 26% of hair caught compared to Roborock’s 59%.

Dreame X40 Master and Roborock S8 MaxV Ultra Hair Tangle Test
The Dreame X40 Master (left) demonstrated less hair tangles than the Roborock S8 MaxV Ultra (right) in our Hair Tangle Test. ©Vacuum Wars
Dreame X40 Master and Roborock S8 MaxV Ultra Hair Tangle Test Scores
Roborock S8 MaxV Ultra and Dreame X40 Master Hair Tangle Test Scores ©Vacuum Wars

Mopping Features and Performance

These robot vacuums use very different hardware to mop floors: The Roborock uses VibraRise technology with a vibrating single mop pad, while the Dreame employs dual spinning mop pads.

Looking at these robot vacuums mopping systems.
Looking at the Dreame X40 (left) and Roborock (right) robot vacuums’ mopping systems . ©Vacuum Wars

They both also have edge-mopping capabilities with extending mop pads. The Dreame’s auto-extending mop pad provided better coverage, even reaching under doors and furniture.

Although both models feature edge mopping, the X40 Master extended mop pad provided better coverage ©Vacuum Wars
Although both models feature edge mopping, (Roborock top left and Dreame top right) the X40 Master extended mop pad provided better coverage. ©Vacuum Wars

Both models also allow water dispensing control via their apps.

App controls for the Dreame X40 and Roborock S8 MaxV robot vacuums
Exploring the app controls for the Dreame X40 and Roborock S8 MaxV robot vacuums. ©Vacuum Wars

In our dried-on stain tests, the Dreame slightly edged out the Roborock with a score of 92 versus 88, though with the margin of error, that margin was negligible.

Roborock S8 MaxV and Dreame X40 Master performing the dried on stain test.
Roborock S8 MaxV and Dreame X40 Master performing the dried on stain test. ©Vacuum Wars

However, what really sets these mopping systems apart are their fully featured charging docks. Both mopping systems stand out with fully featured charging docks that handle nearly every aspect of cleaning and maintenance:

  • Recharge the robots
  • Empty dustbins into a disposable bag
  • Automatically wash and dry mop pads
  • Refill onboard water tanks
  • Use hot water to wash pads and hot air to dry them
  • Dirty water sensors with self-cleaning options

Plumbing Integration

Compared to most robot vacuums, the big distinction with these two robot vacuums is that they both come with tubing and plumbing connections so that you can connect them to your house’s plumbing system. They both come with a remarkably similar three-way diverter valve and roughly the same amount of tubing, so there wasn’t much difference in terms of what was included.

Both systems include similar plumbing components ©Vacuum Wars
Both systems include similar plumbing components. ©Vacuum Wars

There are many ways to connect these to your home’s plumbing, but the simplest option is to place them near a sink or toilet. Alternatively, you could build a custom cabinet or similar enclosure. While the installation is relatively straightforward, having some basic plumbing know-how is helpful—if you’re unsure, it’s best to ask someone handy for assistance.

Dock Size Differences

One thing to note is that the Dreame’s dock is quite a bit longer than the Roborock’s dock, and depending on where you want to put it, it could easily stick out too far if it’s not built into a custom cabinet or something similar. The Roborock dock is shorter and taller and would look more normal just against a wall.

Roborock S8 MaxV Ultra (top) and Dreame X40 Master (below) size differences.
Roborock S8 MaxV Ultra (top) and Dreame X40 Master (below) size differences. ©Vacuum Wars

Obstacle Avoidance

Both have front-mounted obstacle avoidance cameras and structured light sensors to recognize and avoid objects. While the Roborock got a respectable, average score in our obstacle avoidance tests, the Dreame was significantly better, earning one of the higher scores we’ve seen.

In fact, the Dreame has also been programmed to recognize a higher number of objects—120, compared to only 73 on the Roborock. If obstacle avoidance is important to you, the Dreame X40 Master is definitely better.

Roborock S8 MaxV UltraDreame X40 UltraAverage Robot Vacuum Tested at Vacuum Wars
Obstacle Avoidance Score162217
Objects Recognized73120N/A
These are Vacuum Wars test results only, and are not to be understood as official specifications.
Dreame X40 Master and Roborock S8 MaxV Ultra Obstacle Avoidance Evaluations
Dreame X40 Master and Roborock S8 MaxV Ultra Obstacle Avoidance Evaluations at our studio. ©Vacuum Wars

Related: See how we test robot vacuum mops.

Battery Life

We found the Dreame X40 Master to have better battery life overall, even though they have similar official numbers on low power. In our tests—which we run on all of their power settings—the X40 Master was more efficient and had a much higher square-foot-per-charge estimation. While both of their battery scores were above average, the Dreame X40 was better.

Battery Scores

Roborock S8 MaxV UltraDreame X40 UltraAverage Robot Vacuum Tested at Vacuum Wars
Official Battery Life Minutes (Low Power)180189154
Battery Efficiency
Minutes per %
1.663.441.36
Square Foot Per Charge (Estimated)148925911007
These are Vacuum Wars test results only, and are not to be understood as official specifications.

They both navigate around the house in a similar way, using a top-mounted LiDAR sensor to map and move around. They both have multi-level mapping, fast mapping, and in our navigation and coverage tests, they were both amazing at efficiently covering the space without getting stuck—though the Dreame X40 Master ended up with a higher navigation score as well.

Dreame X40 Master and Roborock S8 MaxV Ultra Navigation Scores
Dreame X40 Master and Roborock S8 MaxV Ultra Navigation Scores ©Vacuum Wars

Apps and Software

Both brands have what I consider some of the best apps in the business, with seemingly every possible advanced software feature you can find on a robot vacuum. They both maintain excellent app ratings on the app stores.

The main difference is that the Dreame doesn’t have a built-in virtual voice assistant, whereas the Roborock does. However, the Dreame can still be used with Amazon Alexa and similar devices.

While both apps have advanced features and high user ratings, the Roborock app has an integrated voice assistant ©Vacuum Wars
While both apps have advanced features and high user ratings, the Roborock app has an integrated voice assistant ©Vacuum Wars

Final Verdict

Which one is better? After adding up all the scores, the Dreame X40 Master (Amazon Link) beat out the Roborock S8 MaxV Ultra (Amazon Link) by a significant margin. However, both of their final Vacuum Wars scores were above average. As of the time of writing, the Dreame X40 Master is currently ranking #4 on our Vacuum Wars Top 20 list with 4.5 stars, while the Roborock S8 MaxV Ultra is in 11th place with 4 stars.

Update 1/27/25: The Dreame X40 Master is currently ranking 2nd with 4.7 stars, while the Roborock S8 MaxV Ultra is now 8th with 4.4 stars.

Dreame X40 Master
Comes out ahead!

Dreame X40 Master at the Vacuum Wars Studio

$1,599.99 $1,999.99

See at Amazon

Roborock S8 MaxV Ultra

$1,899.99

See at Amazon
Though both models performed well, the Dreame X40 Master emerged the winner ©Vacuum Wars
Though both models performed well, the Dreame X40 Master emerged the winner ©Vacuum Wars

 

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Home Dreame Reviews Roborock S8 MaxV Ultra vs Dreame X40 Master – Battle of the Plumbots

Christopher White

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Christopher White CEO
Christopher White is the CEO of Vacuum Wars, the premier YouTube channel dedicated to vacuum cleaner reviews. Over the past eight years, Vacuum Wars has become a trusted resource, meticulously reviewing hundreds of robot vacuums, cordless vacuums, carpet cleaners, and various floor care products. Known for their comprehensive in-house testing, Vacuum Wars has built one of the most extensive databases of vacuum cleaner metrics available. Under Christopher’s leadership, the channel has maintained a strict no-sponsorship policy, ensuring that all reviews remain unbiased and trustworthy. This dedication to integrity has garnered a loyal following of over 300,000 subscribers who rely on their expert advice. Christopher is also a recognized authority on robot vacuums, boasting one of the largest private collections of these devices worldwide. Learn more.

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