Kärcher RVM 4 Comfort Extra
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Before you buy, compare it with 2 recommended alternatives
No store 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 Kärcher RVM 4 Comfort Extra | Cheapest of the top 10 MOVA P70 Pro Ultra Best on 3 facts | Highest score here Narwal Freo 20 Best on 6 facts | |
|---|---|---|---|
| Price and ranking | |||
| Lowest price | – | $641MOVA (brand store) best | $849Narwal (brand store) |
| Score | not in our ranking | best | |
| Rank | – | rank 11 of 65 with an all-in-one station | rank 1 of 65 with an all-in-one station |
| Customer rating | – | ★ 4.3 · 25 reviews | ★ 4.4 · 61 reviews best |
| Mopping | |||
| Mop type | spinning pads | spinning pads | roller mop |
| Mop lift on carpet higher is better | – | 0.4 in (10.5 mm) best | 0.4 in (10 mm) |
| Automatic mop detach | – | yes (best) | no |
| Washes the mop same on all | yes | yes | yes |
| Hot-air drying same on all | yes | yes | yes |
| Station | |||
| Station same on all | all-in-one station | all-in-one station | all-in-one station |
| Dust bag lasts longer is better | – | up to 100 days | up to 120 days best |
| Plumbing hookup | – | no | – |
| Brush and obstacles | |||
| Anti-tangle brush | – | no | yes (best) |
| Obstacle avoidance | – | AI camera | AI camera |
| Climbs thresholds up to higher is better | – | 0.9 in (22 mm) | 1.6 in (40 mm) best |
| Climbing system for high thresholds | – | no | no |
| Size, noise and age | |||
| Robot height lower is better | 3.9 in (10 cm) | 4.1 in (10.4 cm) | 3.7 in (9.5 cm) best |
| Noise not judged | 67 dB | 72 dB | – |
| On the market since | – | April 2026 | June 2026 |
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.
Kärcher RVM 4 Comfort Extra 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 2.3 l dust bag in the station.
Dimensionsrobot and dock
From the published dimensions. The robot passes under furniture with 4 in of clearance or more.
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.
- 15,000 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
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.
- spinning pads
- 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
Dock 8 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.
- 2.3 l
- Washes the mop
The dock washes the mop for you, so you do not rinse it by hand.
- yes
- 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
- Clean water tank
The clean water tank in the dock, which wets the mop.
- 2.5 l
- Dirty water tank
The tank that catches the dirty water from the mop. You empty this one yourself.
- 3 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 recognizes more.
- LiDAR turret
- Stair-edge sensors
Sensors under the robot that see a drop, so it stops at the top of a staircase instead of falling down it.
- yes
Robot 5 facts
- Robot height
How tall the robot is. It decides whether it fits under your sofa, bed or cabinet.
- 3.9 in (10 cm)
- Robot diameter
How wide the robot is. Narrower gets between chair legs more easily, wider usually means a bigger dust bin.
- 13.8 in (35 cm)
- Robot weight
What the robot weighs. It counts most if you carry it up a staircase every day.
- 8.4 lb (3.8 kg)
- 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
- Noise
The noise in decibels, in the setting its source names: makers mostly give the standard setting, stores often the highest. 65 dB is like a vacuum at half power, 55 dB like a conversation.
- 67 dB
Battery 2 facts
- Battery capacity
The capacity of the battery. It hints at the runtime, but how much the robot draws counts just as much.
- 5,200 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.
- 160 min
Smart features and warranty 1 fact
- Security updates until
The year until which the maker promises security updates for the robot and its app. After that, new weaknesses in a robot on your network stay open.
- 2032
Sources: karcher.com
Frequently asked questions about the Kärcher RVM 4 Comfort Extra
Does the Kärcher RVM 4 Comfort Extra empty its own dust bin?
Yes. The station empties the robot’s dust bin after every run. The station takes a 2.3 l dust bag.
Does the Kärcher RVM 4 Comfort Extra wash and dry its own mop?
Yes. The station washes the mop itself. It then dries the mop with warm air.
Does the Kärcher RVM 4 Comfort Extra fit under low furniture?
The robot is 3.9 in (10 cm) tall, so it fits under furniture with at least 4 in of clearance.
How long does the Kärcher RVM 4 Comfort Extra run on one charge?
160 minutes on its quietest setting.