Xiaomi Robot S12 Review | 118 Data compared

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  • Avg. price in UK: ~£160
  • Avg. price in US: ~$150
  • Max suction power: 4000 Pa
  • Runtime: 130 min
  • Dustbin capacity: 300 mL
  • Max threshold height: 20 mm

Xiaomi Robot S12 review. Compare 118 technical specifications and user reviews to see how this product ranks in the Robot Vacuums category and whether it is worth buying.

6.4

Overall score

What it is: An overall evaluation of the robot vacuum's quality, based on technical analyses and user reviews.

When it matters: When you need a quick reference to identify the best robot vacuums on the market.

Score components:

80.0%

6.5

Technical Score

20.0%

6.0

User score

Good
6.5

Technical Score

What it is: An assessment of robot-vacuum performance across cleaning, navigation, mopping, battery life, filtration, brush design, smart features, and dimensions.

When it matters: When you want to compare robot vacuums based on technical performance and available features.

Score components:

30.0%

6.2

Cleaning

23.0%

8.0

Navigation

18.0%

5.9

Mopping

12.0%

4.9

Battery

10.0%

8.4

Smart Features

7.0%

4.4

Design

Good
6.0

User score

What it is: A rating that combines user reviews and the total number of reviews received by the robot vacuum

When it matters: When you want to know how a robot vacuum handles daily tasks and how reliable it remains over time according to user feedback.

Score components:

70.0%

8.0

User reviews

30.0%

1.5

Popularity

User score:
United Kingdom
amazon
4.0
(7)

(Reviews last updated: July 2026)

Good
  • 4.8
    Mopping

    Score components:

    35.0%

    5.2

    Mopping system type

    25.0%

    4.0

    Mop lifting

    20.0%

    4.0

    Auto water refill

    20.0%

    6.1

    Water tank capacity

  • 4.0
    Pet homes

    Score components:

    35.0%

    4.0

    Anti-tangle technology

    30.0%

    4.7

    Max suction power

    20.0%

    4.0

    Carpet boost

    15.0%

    2.9

    Dustbin capacity

  • 6.5
    Navigation and mapping

    Score components:

    30.0%

    8.5

    Primary navigation technology

    30.0%

    5.7

    Obstacle avoidance technology

    20.0%

    1.0

    Object recognition

    20.0%

    10

    Real-time mapping

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Best prices in UK

Best rankings

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Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

Verdict

The Xiaomi Robot Vacuum S12 is a mid-range, 2-in-1 sweeping and mopping device powered by a 45W brushless motor that delivers up to 4000 Pa of suction alongside a 3200 mAh battery providing a 130-minute runtime. Its defining characteristic is the 360-degree Laser Distance Sensor (LDS) navigation system paired with a 300 ml dustbin and an electronically controlled water tank that utilizes custom Y-shaped and zigzag paths to simulate manual mopping. Main advantages include precise multi-floor mapping, custom no-go zones via the Xiaomi Home app, integrated carpet detection, an allergy filter, and quiet 60 dB operation. However, notable drawbacks include its lack of a standby power-saving mode, occasionally buggy dock relocation when paused, a relatively small dust container, and limited effectiveness on thick, high-pile carpets.

Technical Specifications of robot vacuum Xiaomi Robot S12

Technical Score

What it is: An assessment of robot-vacuum performance across cleaning, navigation, mopping, battery life, filtration, brush design, smart features, and dimensions.

When it matters: When you want to compare robot vacuums based on technical performance and available features.

Score components:

30.0%

6.2

Cleaning

23.0%

8.0

Navigation

18.0%

5.9

Mopping

12.0%

4.9

Battery

10.0%

8.4

Smart Features

7.0%

4.4

Design

6.5
Xiaomi Robot S12 has a technical score of 6.51, lower than that of 60.2% of robot vacuums.
User score

What it is: A rating that combines user reviews and the total number of reviews received by the robot vacuum

When it matters: When you want to know how a robot vacuum handles daily tasks and how reliable it remains over time according to user feedback.

Score components:

70.0%

8.0

User reviews

30.0%

1.5

Popularity

User score:
United Kingdom
amazon
4.0
(7)

(Reviews last updated: July 2026)

6.0
Xiaomi Robot S12 has a user score of 6.05, lower than that of 93.3% of robot vacuums.
Popularity
What it is: An indicator based on the number of reviews received by the robot vacuum.
When it matters: When you prefer to purchase a product chosen and reviewed by many other consumers.
1.5
Xiaomi Robot S12 has a popularity of 1.5 points, which is lower than 67.9% of products in this category.
Ratio quality/price

What it is: An indicator that combines the robot vacuum's overall rating with its cost.

When it matters: When you are looking for a robot vacuum with a good balance between quality and price.

Score components:

60.0%

6.4

Overall score

40.0%

9.7

Price

7.4
Xiaomi Robot S12 has a quality-to-price ratio of 7.4 points, which is lower than 53.1% of products in this category.
Max suction power
What it is: Maximum suction power is the highest pressure the vacuum motor is rated to produce, measured in pascals.
When it matters: Higher figures can help lift embedded debris from carpet, but brush design and airflow also determine real cleaning performance.

Importance: HIGH

4,000 Pa
Xiaomi Robot S12 delivers 4,000 Pa of suction power, which is stronger than that of 49.5% of robot vacuums and equal to that of 9.9% of robot vacuums.
N. of suction power levels
What it is: The number of suction levels shows how many power settings can be selected.
When it matters: More levels give finer control over noise, battery use and cleaning strength on different floors.

Importance: MEDIUM

4
Xiaomi Robot S12 has a suction-level count of 4, which is higher than that of 49.4% of robot vacuums and the same as that of 44% of robot vacuums.
Motor type
What it is: Motor type identifies whether the suction motor uses a brushed or brushless design.
When it matters: Brushless motors generally offer better efficiency and durability, although complete airflow design still determines performance.

Importance: LOW

brushless
Xiaomi Robot S12 uses a motor type considered more efficient than those in 2.7% of robot vacuums and matched by 97.3% of robot vacuums.
Power
What it is: Power is the electrical input rating of the robot or its charging system.
When it matters: It describes energy demand, but it should not be treated as a direct measure of suction or floor-cleaning ability.

Importance: LOW

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Cleaning modes
What it is: Cleaning modes are the distinct automatic or targeted cleaning programs available on the robot.
When it matters: A wider choice makes it easier to match cleaning behavior to rooms, spills, edges or quiet periods.

Importance: MEDIUM

3
Xiaomi Robot S12 offers 3 cleaning modes, which is fewer than 62% of robot vacuums and as many as 27.7% of robot vacuums.
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Mopping capability
What it is: Mopping capability means the robot can wipe hard floors with a damp pad or active mop system.
When it matters: It is useful for fine dust and light marks, but it does not automatically mean the robot can replace deep manual mopping.

Importance: MEDIUM

yes
Xiaomi Robot S12 can mop floors. This feature is available on 78.9% of robot vacuums.
Mopping system type
What it is: The mopping system type describes how the robot applies motion and pressure to its mop, such as a static pad, vibrating pad, rotating pads or roller.
When it matters: Active systems generally scrub dried marks better, while pad lifting and dock washing determine how practical they are on mixed floors.

Importance: HIGH

static pad
Xiaomi Robot S12 uses static pad for mopping, a system that is more effective than those in 20.4% of robot vacuums and matched by 46.3% of robot vacuums.
Mop pad type
What it is: Mop pad type describes the pad shape and attachment used by the mopping system.
When it matters: It affects floor contact, edge reach, replacement availability and whether the pads can be washed easily.

Importance: LOW

semi-circular
Mop pad material
What it is: Mop pad material is the fabric or fibre used to wipe and absorb dirt from the floor.
When it matters: It influences absorption, scrubbing action, durability and how easily the pad releases dirt when washed.

Importance: LOW

microfiber
Mop pressure
What it is: Mop pressure is the downward force the mopping system applies to the floor.
When it matters: More controlled pressure can improve removal of dried marks, although pad motion and moisture delivery also matter.

Importance: LOW

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Primary navigation technology
What it is: The primary navigation technology is the main sensor system the robot uses to understand its position and plan a route.
When it matters: It affects route efficiency, coverage and how reliably the robot returns to its dock, especially in larger or more complex homes.

Importance: HIGH

LiDAR
Xiaomi Robot S12 uses LiDAR as its primary navigation system, which is more capable than the systems in 34.7% of robot vacuums and matched by 60.4% of robot vacuums.
Mapping capability
What it is: Mapping capability lets the robot create a floor plan instead of cleaning only from moment-to-moment sensor reactions.
When it matters: A saved map is important for room selection, no-go zones and predictable coverage.

Importance: MEDIUM

yes
Xiaomi Robot S12 maps the floor. This feature is available on 74% of robot vacuums.
Real-time mapping
What it is: Real-time mapping updates the floor plan and the robot's route while a cleaning run is in progress.
When it matters: It helps you follow progress, spot missed areas and see where the robot is if it becomes stuck.

Importance: LOW

yes
Xiaomi Robot S12 updates its map in real time. This feature is available on 68.5% of robot vacuums.
Grounded yes from data_scrape2/data_scrape4 (agreement or one clear yes with other source empty/noisy).
Multiple map storage
What it is: Multiple map storage keeps separate floor plans for more than one level or cleaning area.
When it matters: It is useful in multi-storey homes because the robot does not need to rebuild the map each time it changes floors.

Importance: LOW

yes
Xiaomi Robot S12 stores multiple maps. This feature is available on 56.5% of robot vacuums.
Map editing
What it is: Map editing lets you divide, merge, name and adjust rooms in the app.
When it matters: Accurate room boundaries make room-by-room schedules and targeted cleaning easier to use.

Importance: LOW

yes
Xiaomi Robot S12 lets you edit maps. This feature is available on 63.9% of robot vacuums.
Grounded yes from data_scrape2/data_scrape4 (agreement or one clear yes with other source empty/noisy).
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App control
What it is: App control lets you operate and configure the robot from a smartphone application.
When it matters: It is needed for maps, room selection, schedules and many advanced settings on modern robot vacuums.

Importance: LOW

yes
Xiaomi Robot S12 supports app control. This feature is available on 94.4% of robot vacuums.
App name
What it is: App name identifies the manufacturer's mobile application used to control the robot.
When it matters: It helps you check phone compatibility, account requirements and user feedback for the correct app before buying.

Importance: LOW

Xiaomi Home
Wi-Fi connectivity
What it is: Wi-Fi connectivity links the robot to its app and cloud services through the home network.
When it matters: It enables remote control and updates, but setup quality depends on router compatibility and signal coverage.

Importance: LOW

yes
Xiaomi Robot S12 connects to Wi-Fi. This feature is available on 93.7% of robot vacuums.
Supported Wi-Fi bands
What it is: Supported Wi-Fi bands identify the wireless frequencies the robot can use, commonly 2.4 GHz and sometimes 5 GHz.
When it matters: Band support matters during setup because many robot vacuums connect only to a 2.4 GHz network.

Importance: LOW

2.4 GHz
Bluetooth connectivity
What it is: Bluetooth connectivity provides a short-range wireless link, often used during initial setup.
When it matters: It can simplify pairing but usually does not replace Wi-Fi for remote app control.

Importance: LOW

no
Xiaomi Robot S12 does not support Bluetooth, while this feature is available on 64.7% of robot vacuums.
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Battery capacity
What it is: Battery capacity is the amount of electrical charge the battery can store, measured in milliamp-hours.
When it matters: More capacity can support longer cleaning runs, but motor power, mopping and navigation also affect actual runtime.

Importance: MEDIUM

3,200 mAh
Xiaomi Robot S12 has a battery capacity of 3,200 mAh; it is higher than that of 44.2% of robot vacuums and equal to that of 11.5% of robot vacuums.
Battery type
What it is: Battery type identifies the battery chemistry used by the robot.
When it matters: It affects weight, service life and charging behavior, with lithium-ion now being the common modern design.

Importance: LOW

Li-ion
Battery voltage
What it is: Battery voltage is the nominal electrical voltage of the robot's battery pack.
When it matters: It is mainly useful for checking replacement-battery compatibility and does not by itself indicate runtime.

Importance: LOW

14.8
Runtime
What it is: Runtime is how long the robot is rated to clean on one charge under the stated test mode.
When it matters: Longer runtime matters on large floors, while recharge-and-resume can compensate for a smaller battery.

Importance: MEDIUM

130 min
Xiaomi Robot S12 runs for 130 min per charge; this is shorter than 55.3% of robot vacuums and equal to 2% of robot vacuums.
Recharge and resume
What it is: Recharge and resume sends the robot back to charge and then returns it to the unfinished part of the map.
When it matters: It allows large cleaning jobs to finish without manual intervention when one battery charge is not enough.

Importance: LOW

yes
Xiaomi Robot S12 resumes cleaning after charging. This feature is available on 83.1% of robot vacuums.
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Shape
What it is: Shape describes the robot's body outline, most commonly round or D-shaped.
When it matters: Shape influences corner reach and manoeuvring, although brush placement and route planning are equally important.

Importance: LOW

round
Height
What it is: Height is the vertical clearance required by the robot.
When it matters: A lower body can clean under more sofas, beds and cabinets, but measure the furniture gap before relying on it.

Importance: LOW

94.5 mm
Xiaomi Robot S12 is 94.5 mm tall; this is higher than 50.8% of robot vacuums and equal to 0.6% of robot vacuums.
Width
What it is: Width is the side-to-side size of the robot.
When it matters: It determines whether the robot can pass between chair legs, furniture and other narrow spaces.

Importance: LOW

350 mm
Xiaomi Robot S12 is 350 mm wide; this is wider than 63.5% of robot vacuums and equal to 20.3% of robot vacuums.
Length
What it is: Length is the front-to-back size of the robot.
When it matters: Together with width and shape, it affects turning space and access around closely placed furniture.

Importance: LOW

350 mm
Xiaomi Robot S12 is 350 mm long; this is longer than 62% of robot vacuums and equal to 21.1% of robot vacuums.
Weight
What it is: Weight is the mass of the robot itself, excluding its dock.
When it matters: A lighter robot is easier to carry between floors, while weight has little direct connection to cleaning quality.

Importance: LOW

4.8 kg
Xiaomi Robot S12 weighs 4.8 kg; this is more than 90.6% of robot vacuums and equal to 0.7% of robot vacuums.
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Xiaomi Robot S12 vs the average robot vacuum

  • 0.97 % Higher filtration efficiency
    Xiaomi Robot S12 has a higher filtration efficiency than the average robot vacuum (100% vs 99%).
    One grounded fallback source indicates 99.97% filtration.
    What it is: Filter efficiency is the stated percentage of particles the filter can retain under its specified test conditions.
    When it matters: It matters for fine dust and allergens, although leakage around the filter can reduce whole-machine performance.

    Importance: MEDIUM

    Xiaomi Robot S12 has a higher filtration efficiency than the average robot vacuum (100% vs 99%).99.97 % vs 99 %
  • 1.5 W lower standby use
    Xiaomi Robot S12 uses 0.5 W in standby, compared with 2 W for the average robot vacuum.
    What it is: Standby power consumption is the electricity used while the robot or dock is idle but connected to power.
    When it matters: Lower standby use matters because the charging station normally remains plugged in all day.

    Importance: LOW

    Xiaomi Robot S12 uses 0.5 W in standby, compared with 2 W for the average robot vacuum.0.5 W vs 2 W
  • 12 mm wider main brush
    Xiaomi Robot S12 uses a main brush measuring 190 mm, compared with 178 mm for the average robot vacuum.
    What it is: Main brush width is the working width of the central debris-collecting roller.
    When it matters: A wider brush can cover more floor per pass, while edge design and navigation still affect total coverage.

    Importance: LOW

    Xiaomi Robot S12 uses a main brush measuring 190 mm, compared with 178 mm for the average robot vacuum.190 mm vs 178 mm
  • 1.5 W lower standby use
    Xiaomi Robot S12 uses 0.5 W in standby, compared with 2 W for the average robot vacuum.
  • 0.97 % Higher filtration efficiency
    Xiaomi Robot S12 has a higher filtration efficiency than the average robot vacuum (100% vs 99%).
  • 12 mm wider main brush
    Xiaomi Robot S12 uses a main brush measuring 190 mm, compared with 178 mm for the average robot vacuum.
  • 1.5 h slower charging
    Xiaomi Robot S12 takes 6 h to charge, compared with 4.5 h for the average robot vacuum.
  • 20 min shorter runtime
    Xiaomi Robot S12 runs for 130 min per charge, compared with 150 min for the average robot vacuum.
  • 30 m² less cleaning coverage
    Xiaomi Robot S12 can clean up to 150 m² per charge, compared with 180 m² for the average robot vacuum.
  • 1.27 kg heavier robot
    Xiaomi Robot S12 weighs 4.8 kg, compared with 3.53 kg for the average robot vacuum.
  • 11.35 mm wider body
    Xiaomi Robot S12 is 350 mm wide, compared with 338.65 mm for the average robot vacuum.
  • 10 mm longer body
    Xiaomi Robot S12 is 350 mm long, compared with 340 mm for the average robot vacuum.
  • Does not support Bluetooth
    Xiaomi Robot S12 does not support Bluetooth, while the average robot vacuum connects via Bluetooth.
  • More basic obstacle avoidance
    Xiaomi Robot S12 uses LiDAR obstacle avoidance, while the average robot vacuum uses hybrid.
  • Does not support no-mop zones
    Xiaomi Robot S12 does not support no-mop zones, while the average robot vacuum supports configurable no-mop zones.
  • Does not detect carpets automatically
    Xiaomi Robot S12 does not detect carpets automatically, while the average robot vacuum detects carpets automatically.
  • Does not boost suction automatically on carpets
    Xiaomi Robot S12 does not boost suction automatically on carpets, while the average robot vacuum boosts suction on carpets automatically.
  • 1 fewer cleaning modes
    The number of cleaning modes on Xiaomi Robot S12 is 3, compared with 4 on the average robot vacuum.
  • 100 mL smaller dustbin
    Xiaomi Robot S12 has a dustbin capacity of 300 mL, compared with 400 mL for the average robot vacuum.
  • 70 mL smaller water tank
    Xiaomi Robot S12 has a water tank capacity of 170 mL, compared with 240 mL for the average robot vacuum.
  • More basic obstacle avoidance
    Xiaomi Robot S12 uses LiDAR obstacle avoidance, while the average robot vacuum uses hybrid.
    What it is: Obstacle avoidance technology uses sensors, cameras, LiDAR or structured light to detect objects and route around them.
    When it matters: More capable systems reduce contact with cables, shoes, pet bowls and other clutter, so the robot needs fewer rescues.

    Importance: HIGH

    Xiaomi Robot S12 uses LiDAR obstacle avoidance, while the average robot vacuum uses hybrid.LiDAR vs hybrid
  • Does not detect carpets automatically
    Xiaomi Robot S12 does not detect carpets automatically, while the average robot vacuum detects carpets automatically.
    What it is: Carpet detection allows the robot to recognize when it moves from hard flooring onto carpet or a rug.
    When it matters: It enables carpet-specific actions such as suction boost, mop lifting or carpet avoidance.

    Importance: MEDIUM

    Xiaomi Robot S12 does not detect carpets automatically, while the average robot vacuum detects carpets automatically.
  • Does not support no-mop zones
    Xiaomi Robot S12 does not support no-mop zones, while the average robot vacuum supports configurable no-mop zones.
    What it is: No-mop zones are mapped areas that the robot avoids while its mop is attached or wet.
    When it matters: They protect rugs and moisture-sensitive floors when the robot cannot lift its mop high enough.

    Importance: LOW

    Xiaomi Robot S12 does not support no-mop zones, while the average robot vacuum supports configurable no-mop zones.
  • Does not boost suction automatically on carpets
    Xiaomi Robot S12 does not boost suction automatically on carpets, while the average robot vacuum boosts suction on carpets automatically.
    What it is: Carpet boost automatically increases suction when the robot detects carpet.
    When it matters: It helps pull debris from carpet fibres without using maximum power for the entire cleaning run.

    Importance: MEDIUM

    Xiaomi Robot S12 does not boost suction automatically on carpets, while the average robot vacuum boosts suction on carpets automatically.
  • 1 fewer cleaning modes
    The number of cleaning modes on Xiaomi Robot S12 is 3, compared with 4 on the average robot vacuum.
    What it is: Cleaning modes are the distinct automatic or targeted cleaning programs available on the robot.
    When it matters: A wider choice makes it easier to match cleaning behavior to rooms, spills, edges or quiet periods.

    Importance: MEDIUM

    The number of cleaning modes on Xiaomi Robot S12 is 3, compared with 4 on the average robot vacuum.3 vs 4
  • 1.27 kg heavier robot
    Xiaomi Robot S12 weighs 4.8 kg, compared with 3.53 kg for the average robot vacuum.
    What it is: Weight is the mass of the robot itself, excluding its dock.
    When it matters: A lighter robot is easier to carry between floors, while weight has little direct connection to cleaning quality.

    Importance: LOW

    Xiaomi Robot S12 weighs 4.8 kg, compared with 3.53 kg for the average robot vacuum.4.8 kg vs 3.53 kg
  • 100 mL smaller dustbin
    Xiaomi Robot S12 has a dustbin capacity of 300 mL, compared with 400 mL for the average robot vacuum.
    What it is: Dustbin capacity is the amount of dry debris the bin inside the robot can hold.
    When it matters: A larger bin needs emptying less often, which matters in homes with pets unless an auto-empty dock is included.

    Importance: MEDIUM

    Xiaomi Robot S12 has a dustbin capacity of 300 mL, compared with 400 mL for the average robot vacuum.300 mL vs 400 mL
  • 1.5 h slower charging
    Xiaomi Robot S12 takes 6 h to charge, compared with 4.5 h for the average robot vacuum.
    What it is: Charging time is the approximate time required to refill the battery from low charge.
    When it matters: A shorter charge is useful when the robot must resume an unfinished large cleaning job.

    Importance: LOW

    Xiaomi Robot S12 takes 6 h to charge, compared with 4.5 h for the average robot vacuum.6 h vs 4.5 h

Graphic comparison of Xiaomi Robot S12 and other robot vacuums

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Third-party reviews

United Kingdom

(Reviews last updated: July 2026)

What customers like about Xiaomi Robot S12?

  • Excellent value for money and a very capable entry-to-mid level robotic cleaner.
  • Strong suction power of $4000\text{ Pa}$ efficiently picks up dirt, pet hair, and debris on hard floors and low-pile carpets.
  • Smart LDS laser navigation ensures precise mapping, systematic cleaning patterns, and effective obstacle avoidance without bumping excessively.
  • Customizable app controls via the Mi Home app allow users to set up no-go zones, virtual walls, and targeted room cleaning.
  • Solid hybrid functionality with combined sweeping and mopping capabilities featuring adjustable water flow.

What customers dislike about Xiaomi Robot S12?

  • Struggles with high-pile rugs and may occasionally get stuck on thick carpets or tangled in loose cables.
  • The mopping feature is better suited for daily maintenance and light refreshing rather than removing tough, dried-on stains.
  • Dustbin capacity is somewhat limited (typically around $0.3\text{ L}$), meaning it needs frequent emptying if you have a large home or heavy shedding pets.
  • Like many round robot vacuums, it struggles to reach deep into tight $90^{\circ}$ corners and along baseboards.
  • Requires regular maintenance, such as cleaning the main roller brush to prevent hair tangling and washing/replacing filters.

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