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- RVM 4 Comfort Extra vs Freo Z Ultra
Kärcher RVM 4 Comfort Extra vs Narwal Freo Z Ultra
What RVM 4 Comfort Extra does better (3) and where Freo Z Ultra wins (4) — every spec side by side.
vs
7.6Cleaning power9.0
8.6Navigation8.3
7.9Mopping8.6
6.8Base station8.2
6.6Battery5.4
Dimensions
Size comparison
RVM 4 Comfort ExtraFreo Z Ultra
| RVM 4 Comfort Extra | Freo Z Ultra | Difference | |
|---|---|---|---|
| Height | 100 mm | 106 mm | −6 mm |
| Width / diameter | 350 mm | 350 mm | = |
| Length | 350 mm | 350 mm | = |
| Weight | 3.8 kg | 4.5 kg | −0.7 kg |
Drawn to the same scale from the official dimensions (front and side).
Why is RVM 4 Comfort Extra better than Freo Z Ultra?
- Runtime160 min vs 120 min+33%
- Suction power15,000 Pa vs 12,000 Pa+25%
- Height100 mm vs 106 mm+6%
Why is Freo Z Ultra better than RVM 4 Comfort Extra?
- Clean water tank (dock)2.5 l vs 4.5 l+80%
- Charging time230 min vs 150 min+53%
- Noise level66 dB vs 53 dB+25%
- Dust bag (dock)2.3 l vs 2.5 l+9%
Specifications
Side by side
| Suction & cleaning | ||
| Suction power | 15,000 Pa | 12,000 Pa |
| Dustbin (robot) | — | 800 ml |
| Main brush | Single main brush | Single main brush |
| Side brushes | 1 | 2 |
| Carpet detection | Yes | Yes |
| Dirt detection | — | Yes |
| HEPA filter | — | Yes |
| UV disinfection | — | Yes |
| Noise level | 66 dB | 53 dB |
| Navigation & obstacles | ||
| Navigation | Laser (LiDAR) | Laser (LiDAR) |
| Navigation sensors | LiDAR laser (LDS), Wall sensor, Cliff sensors, Ultrasonic sensor | LiDAR laser (LDS), Wall sensor, Cliff sensors, Ultrasonic sensor |
| Obstacle avoidance | AI camera | AI camera |
| No-go zones / virtual walls | — | Yes |
| Room mapping & room selection | Yes | Yes |
| Mopping | ||
| Mop type | Rotating mop pads | Rotating mop pads |
| Mop lifting on carpets | Yes | Yes |
| Mop lift height | — | 12 mm |
| Extending mop (edges) | Yes | — |
| Base station | ||
| Base station | All-in-one dock (empty + wash) | All-in-one dock (empty + wash) |
| Auto-empty dust station | Yes | Yes |
| Dust bag (dock) | 2.3 l | 2.5 l |
| Mop washing in the dock | Yes | Yes |
| Hot-water mop washing | — | Yes |
| Hot-air mop drying | Yes | Yes |
| Automatic water refill | Yes | Yes |
| Clean water tank (dock) | 2.5 l | 4.5 l |
| Dirty water tank (dock) | 3 l | 4 l |
| Battery & runtime | ||
| Battery capacity | 5,200 mAh | 5,200 mAh |
| Runtime | 160 min | 120 min |
| Charging time | 230 min | 150 min |
| Cleaning area per charge | — | 150 m² |
| Size & weight | ||
| Width / diameter | 350 mm | 350 mm |
| Length | 350 mm | 350 mm |
| Height | 100 mm | 106 mm |
| Weight | 3.8 kg | 4.5 kg |
| Shape | Round | Round |
| Colours | White | Grey |
| App & smart home | ||
| App control | Yes | Yes |
| Voice assistants | — | Amazon Alexa, Apple Siri |
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