Kärcher RVM 4 Comfort Extra

No lab has tested it yet, so it is not in our ranking.

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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.

Price and ranking
	This model Kärcher RVM 4 Comfort Extra	Cheapest of the top 10 eufy Omni C28 Best on 2 facts	Highest score here Roborock Qrevo CurvX Best on 5 facts
Lowest price	–	379 €Amazon.de best	856 €Amazon.de
Score	not in our ranking		best
Rank	–	rank 9 of 38 with an all-in-one station	rank 1 of 38 with an all-in-one station
Customer rating	–	★ 4.5 · 147 reviews	–
Mopping
Mop type	spinning pads	roller mop	spinning pads
Mop lift on carpet higher is better	–	10.8 mm	17 mm best
Automatic mop detach	–	no	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 75 days best	up to 65 days
Plumbing hookup	–	no	no
Brush and obstacles
Anti-tangle brush	–	yes	yes
Obstacle avoidance	–	–	AI camera
Climbs thresholds up to higher is better	–	20 mm	30 mm best
Climbing system for high thresholds	–	no	yes (best)
Size, noise and age
Robot height lower is better	10 cm	11.1 cm	8 cm best
Noise not judged	67 dB	55 dB	62 dB
On the market since	–	January 2026	May 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.

Kärcher RVM 4 Comfort Extra specifications

The numbers that matter first, then every fact by group. As published by the maker or the shop we read it from.

Robot height10 cm

Runtime per charge160 min

Suction power15,000 Pa

Noise67 dB

Battery capacity5,200 mAh

Consumables: a 2.3 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 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 kickboard, so the last few centimetres 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 recognises 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.: 10 cm
Robot diameter How wide the robot is. Narrower gets between chair legs more easily, wider usually means a bigger dust bin.: 35 cm
Robot weight What the robot weighs. It counts most if you carry it up a staircase every day.: 3.8 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.: 300 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.: 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