Viomi S9

Score
86/100
Good
983 User reviews
★★★★★
★★★★★
(4.3)

Prices

Amazon UK £600 See Deal
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For multiple rooms

For multiple rooms

With mop

With mop

Climbing height

Climbing height

2.0 cm

Cleaning area

Cleaning area

320 m²

App control

App control

Mapping

Mapping

All specifications »

Pros

  • Auto-empty dust bin
  • Mop follows a Y-pattern
  • Carpet boost
  • App offers a lot of features
  • Mid-range price
  • Long battery life
  • LIDAR navigation system

Cons

  • Makes a loud noise when emptying the dust bin
  • Can't automatically avoid carpets when mopping
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Specifications

Battery
Max runtime
220 min
Charge time
300 min
Battery type
Li-ion
Battery capacity
5200 mAh
Cleaning
Cleaning area
320 m²
Sound level
64 dB
Suction power
2700 Pa
Maximum climbing height
2.0 cm
Power
50.0 w
Mopping function
Yes
Water tank capacity
0.25 l
Other information
Dustbin capacity
0.3 l
Mapping-Sensor
LDS
Type of filter
HEPA
Automatic dirt disposal
Yes
Carpet Boost
Yes
Functions
Automatically docks and recharges
Yes
Recharge and resume function
Yes
Scheduling function
Yes
App control
Yes
Voice control
Yes
Alexa voice control
Yes
Google Home voice control
Yes
Stair sensor and object sensor
Yes
Accessories
Remote control
No
Shape
Shape
Round
Number of side brushes
1
App-functions
Interactive mapping
Yes
Real Time Tracking
Yes
Digital Blocked Area
Yes
Zoned Cleaning
Yes
Multi Floor Maps
Yes
Selected Room Cleaning
Yes
Dimensions and weight
Height
9.8 cm
Width
35.0 cm
Depth
35.0 cm
Weight
3.8 kg

Specification comparison

August 12, 2022

Who should buy Viomi S9

  • The Viomi S9 is a great choice if you have dust allergies, because its auto-empty base will reduce your exposure to allergens when emptying the dust bin.
  • The Viomi S9's auto-empty base is also suitable for those who have busy schedules, because its dust bag only needs to be replaced every 1 or 2 months, depending on how often you use the device.
  • The Viomi S9 is suitable for those who live in large houses, with several floors, because it has a long battery life of up to 220 minutes and can save multiple maps; one for each floor.
  • The Viomi S9 is an excellent option for those on a tight budget who want a robot vacuum that offers impressive features at a mid-range price.

Who should NOT buy Viomi S9

  • If you have carpets, you might want to consider a robot vacuum cleaner whose mopping function has "no-mop zones", or other features that allow it to avoid your carpets. The Roborock S7 MaxV Plus can automatically lift its mopping pad when detecting carpets to prevent them from getting wet, and the Roborock S6 Pure has a no-mop zone feature that allows you to block off carpeted areas on the app.
  • If you live in a small house, and have time to spare for emptying the dust bin, it might be better to look for other, more affordable robot vacuum cleaners that don’t have an auto-empty base, such as the Roborock E5, and the Eufy RoboVac 11S MAX.

Verdict

Faith
BY:
Faith
This is our verdict of the Viomi S9 based on several hours of research of reviews from both experts and users.
Updated 05-07-2022

The Viomi S9 is a robot vacuum cleaner and mop that offers impressive smart features, at an affordable price.
One of its selling points is its docking station, known as the Dumping 2.0, which can automatically empty the dust bin. It has a disposable 3L dust bag that can last for up to 1 to 2 months, depending on how often you vacuum your house. The self-emptying feature is typically found in the more advanced, and expensive robot vacuum cleaners, but the Viomi S9 offers it at a mid-range price. So, those who are on a tight budget will also get to enjoy the convenience of this feature.
After finishing its cleaning cycle, the Viomi S9 automatically returns to its docking station to empty its contents and recharge. The docking station has an LED display that shows its battery life. It will also notify you when it is time to replace the dust bag. However, like all robot vacuums with auto-empty bases, it briefly produces a loud noise when it empties the dust bin.

Unlike the Viomi V3, the Viomi S9 has a carpet boost that can automatically increase the suction power on carpets to clean them more thoroughly. Not only does it vacuum your floors efficiently, but it also has an excellent mop. Unlike most robot vacuums that just drag a damp cloth across the floor, the S9’s mop mimics a scrubbing motion by following a Y pattern, and passes over an area multiple times to remove any stains. This device offers three suction power levels to choose from. It also has three levels of dampness for its mopping pad.

The Viomi S9 is equipped with a LIDAR navigation system that helps it create an accurate map of your floors, and navigate your home without getting stuck. You can connect it to the Xiaomi Home (Mi Home) application to see and customize the map. You can name each room, and create virtual boundaries around the areas you don’t want the robot vacuum to clean. The map automatically splits the rooms, but you can also divide or combine them manually if you want to change the structure of the map. You can also select specific rooms, or areas you want it to clean.

The Mi Home app offers several ways to customize the robot vacuum to your needs, and enhance your experience. You can set it to clean your room in either one, or two, passes. You can also see the records of previous cleanings. Through the app, you can choose between the S and Y modes. S mode is used for vacuuming which is a common navigation pattern among robot vacuums, while Y mode is great to use for mopping, even though it takes longer to clean.

Overall, the Viomi S9 is a reliable robot vacuum cleaner that makes use of advanced technology for everyday cleaning. It is an excellent choice for those who are on a budget.

Viomi S9 vs. Viomi V3 caret-up caret-down

Pros

Can automatically empty the dust bin
Has a carpet boost
Stronger suction power (2700 Pa vs 2600 Pa)

Cons

More expensive
Smaller water tank (0.25L vs. 0.55L)
Smaller dust bin (0.3L vs. 0.55L)

If you are looking for a robot vacuum cleaner that is built for convenience, then the more expensive Viomi S9 might be worth the investment. It offers various automated features, such as the auto-empty bin, and the automatic increase of suction power when detecting carpets, which is favorable for those who have busy schedules as well as those who have carpeted floors. If you live in a large house with hard floors, the Viomi V3 might be more suitable because it has a larger water tank that you won’t have to refill very often.

My review of Viomi S9

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Overall score*
Cleaning Performance
Battery
Value for money
Built Quality
Noise level
Ease of use
Cleaning & Maintenance
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Rankings

Comparison caret-up caret-down

caret-up caret-down Product information
Viomi S9 ‎Laresar L6 Pro
Roborock S6 MaxV
Name Viomi S9 ‎Laresar L6 Pro Roborock S6 MaxV
Score
86
96
95
Rank Rank 35 of 65 Rank 1 of 65 Rank 2 of 65
Reviews
★★★★★
★★★★★
(4.3)
913 reviews
★★★★★
★★★★★
(4.8)
941 reviews
★★★★★
★★★★★
(4.7)
4553 reviews
Price 600 £ 490 £ 465 £
caret-up caret-down Battery
Max runtime 220 min 200 min 180 min
Charge time 300 min 300 min
Battery type Li-ion Li-ion Li-ion
Battery capacity 5200 mAh 5000 mAh 5200 mAh
caret-up caret-down Cleaning
Cleaning area 320 m² 200 m² 240 m²
Sound level 64 dB 67 dB
Suction power 2700 Pa 3000 Pa 2500 Pa
Maximum climbing height 2.0 cm 2.0 cm 2.0 cm
Power 50.0 w 66.0 w
Number of cleaning modes
Mopping function
Water tank capacity 0.25 l 0.25 l 0.3 l
caret-up caret-down Other information
Dustbin capacity 0.3 l 0.3 l 0.46 l
Mapping-Sensor LDS LDS LDS+Camera
Type of filter HEPA HEPA EPA 11
Automatic dirt disposal
Carpet Boost
caret-up caret-down Functions
Automatically docks and recharges
Recharge and resume function
Scheduling function
App control
Voice control
Alexa voice control
Google Home voice control
Stair sensor and object sensor
caret-up caret-down Accessories
Remote control
caret-up caret-down Shape
Shape Round Round Round
Number of side brushes 1 1 1
caret-up caret-down App-functions
Interactive mapping
Real Time Tracking
Digital Blocked Area
Zoned Cleaning
Multi Floor Maps
Selected Room Cleaning
caret-up caret-down Dimensions and weight
Height 9.8 cm 9.6 cm
Width 35.0 cm 35.0 cm
Depth 35.0 cm 35.0 cm
Weight 3.8 kg 3.7 kg

Reviews caret-up caret-down

User reviews
4.3
★★★★★
★★★★★
983 Reviews

caret-up caret-down User reviews

4.3
★★★★★
★★★★★
965 reviews
3.7
★★★★★
★★★★★
3 reviews
3.0
★★★★★
★★★★★
11 reviews
Unknown sources
4.5
★★★★★
★★★★★
4 reviews

Questions and Answers caret-up caret-down

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Klaus Bachmann
Klaus Bachmann

Creator

Hi, my name is Klaus Bachmann, and I am the creator of Reoverview.co.uk. I have been working with household appliances for several years now. I publish unbiased comparisons, based on user reviews, expert reviews and test results. Hope you like the website.
Best regards, Klaus.

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