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The Narwal Flow 2 Ultra wins with a score of 9.1/10. Best for: Hard floor homes that prioritize mopping quality.

The undisputed mopping champion — best FlowWash system with 140°F heated water
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A remarkable value: the Q Revo S pairs Roborock's strongest debris pickup with a full self-empty, self-wash, self-dry, self-refill dock for around $449. Best for hard-floor homes that keep clutter off the floor.
Read full review| Narwal Flow 2 Ultra | Spec | Roborock Q Revo S |
|---|---|---|
| $1499 | Price | $449 |
| 30000 | Suction (Pa) | 7000 |
| 7000 | Battery (mAh) | 5200 |
| — | Noise (dB) | 67.0 |
| — | Dustbin (ml) | — |
| — | Water Tank (ml) | — |
| — | Mop Lift (mm) | — |
| — | Height (mm) | — |
| — | Weight (kg) | — |
| LiDAR + AI Camera | Navigation | PreciSense LiDAR + Reactive Tech |
| ✅ | Self-Empty | ✅ |
| ✅ | Self-Wash Mop | ✅ |
| ✅ | Self-Dry Mop | ✅ |
| ✅ | AI Obstacle | ❌ |
The Narwal Flow 2 Ultra is the better choice with an overall score of 9.1/10 — best for hard floor homes that prioritize mopping quality. The Roborock Q Revo S is more affordable at $449 vs $1499.