Medion X21 SW
No lab has tested it yet, so it is not in our ranking.
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Before you buy, compare it with 2 recommended alternatives
No shop here sells this model today, so beside it the highest-scored model with the same kind of station that one does, and the cheapest of the top 10.
Green is the best of these 3, also when they share the lead.
| This model Medion X21 SW Best on 1 fact | Cheapest of the top 10 Shark PowerDetect Self-Empty Best on 3 facts | Highest score here Roborock Q10 S5+ Best on 2 facts | |
|---|---|---|---|
| Price and ranking | |||
| Lowest price | – | 165 €Amazon.de best | 359 €Amazon.de |
| Score | not in our ranking | best | |
| Rank | – | rank 3 of 4 with an auto-empty station | rank 1 of 4 with an auto-empty station |
| Customer rating | – | ★ 3.9 · 384 reviews | ★ 4.0 · 1,563 reviews best |
| Mopping | |||
| Mop type | flat or vibrating pad | – | flat or vibrating pad |
| Mop lift on carpet higher is better | – | – | 8 mm |
| Automatic mop detach | – | – | no |
| Washes the mop | – | no | no |
| Hot-air drying | – | – | no |
| Station | |||
| Station same on all | auto-empty station | auto-empty station | auto-empty station |
| Dust bag lasts longer is better | – | – | up to 49 days |
| Plumbing hookup | – | – | no |
| Brush and obstacles | |||
| Anti-tangle brush | – | – | yes |
| Obstacle avoidance | – | 3D sensor (structured light) | 3D sensor (structured light) |
| Climbs thresholds up to higher is better | 18 mm | 25 mm best | 20 mm |
| Climbing system for high thresholds | – | yes (best) | no |
| Size, noise and age | |||
| Robot height lower is better | 9.3 cm best | – | 9.9 cm |
| Noise not judged | 68 dB | – | 65 dB |
| On the market since | – | June 2024 | February 2025 |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.
Medion X21 SW specifications
The numbers that matter first, then every fact by group. As published by the maker or the shop we read it from.
Consumables: a 2.5 l dust bag in the station.
Dimensionsrobot and dock
From the published dimensions. The robot passes under furniture with 10 cm of clearance or more.
Suction and brushes 4 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.
- 3,000 Pa
- Carpet detection
The robot notices when it drives onto a carpet. Most then raise their suction, and a mopping robot lifts its mop or leaves it at the dock.
- detects carpet and boosts suction
- Suitable for pet hair
Whether the robot copes with pet hair: a brush that hair does not wind around and a dock that empties the bin for you. Where the maker does not say so itself, we read it from those two.
- yes
- Filter type
The filter the exhaust air passes through. A HEPA filter holds back fine dust and pollen, which counts if someone at home has an allergy.
- HEPA
Mopping 2 facts
- Mop type
How the mop is built: flat pads, two spinning discs or a roller. Discs press harder on dried-on dirt, a roller rinses itself while it works.
- flat or vibrating pad
- Water tank in the robot
How much clean water the robot carries. It sets how long it mops before a refill, which a dock does by itself.
- 250 ml
Dock 3 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.
- 2.5 l
Navigation and obstacles 2 facts
- Navigation
How the robot maps your home and follows that map. Lidar measures with a laser and works in the dark, a camera looks along and recognises more.
- LiDAR turret
- 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.
- 18 mm
Robot 5 facts
- Robot height
How tall the robot is. It decides whether it fits under your sofa, bed or cabinet.
- 9.3 cm
- Robot diameter
How wide the robot is. Narrower gets between chair legs more easily, wider usually means a bigger dust bin.
- 32 cm
- Robot weight
What the robot weighs. It counts most if you carry it up a staircase every day.
- 3 kg
- Dust bin in the robot
How much dust the robot holds before you empty it. It matters less with an auto-empty dock, which empties the bin after every run.
- 250 ml
- Noise
The noise in decibels, in the setting its source names: makers mostly give the standard setting, shops often the highest. 65 dB is like a vacuum at half power, 55 dB like a conversation.
- 68 dB
Battery 3 facts
- Battery capacity
The capacity of the battery. It hints at the runtime, but how much the robot draws counts just as much.
- 2,900 mAh
- Runtime per charge
How long the robot cleans on one charge, at its quietest setting. After that it recharges and carries on where it stopped.
- 150 min
- Charging time
How long an empty battery takes to charge fully in the dock.
- 5 h
Smart features and warranty 1 fact
- Warranty
The warranty the maker gives in Germany. Consumer law here stands apart from it and can last longer.
- 2 years
Sources: medion.com
Frequently asked questions about the Medion X21 SW
Does the Medion X21 SW empty its own dust bin?
Yes. The station empties the robot’s dust bin after every run. The station takes a 2.5 l dust bag.
Can the Medion X21 SW mop?
Yes, with a flat mop cloth under the robot.
How high a threshold can the Medion X21 SW climb?
Thresholds up to 18 mm, the maker says. Measure your own thresholds: the ones to a bathroom or balcony are often higher.
Does the Medion X21 SW fit under low furniture?
The robot is 9.3 cm tall, so it fits under furniture with at least 10 cm of clearance.
Is the Medion X21 SW suitable for pet hair?
Yes, the maker says.
How long does the Medion X21 SW run on one charge?
150 minutes on its quietest setting. A full charge takes 5 hours.
