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Side by side
| Narwal Flow × | MOVA E40 Ultra × | |
|---|---|---|
| Lowest price | – | – |
| Score | picked by 1 of 5 tests | not in our ranking |
| Rank | rank 21 of 44 with an all-in-one station | – |
| Customer rating | ★ 3.9 · 1,201 reviews | – |
| Station | all-in-one station | all-in-one station |
| Mop type | roller mop | spinning pads |
| Mop lift on carpet | – | 0.4 in (10.5 mm) |
| Automatic mop detach | – | no |
| Washes the mop | yes | yes |
| Hot-air drying | yes | yes |
| Dust bag lasts | – | up to 75 days |
| Plumbing hookup | – | no |
| Anti-tangle brush | yes | no |
| Obstacle avoidance | AI camera | 3D sensor (structured light) |
| Climbs thresholds up to | 1.6 in (40 mm) | 0.9 in (22 mm) |
| Climbing system for high thresholds | yes | no |
| Robot height | 3.7 in (9.5 cm) | 3.8 in (9.7 cm) |
| Noise | – | 61 dB |
| On the market since | August 2025 | June 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.
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No model fits all these filters.
How we rank
We never average review scores. We look at where 5 test sources (RTINGS, TechRadar, Tom's Guide, Vacuum Wars, and Wirecutter) place a model in their top lists: the higher it stands there and the more sources pick it, the higher its score. The price is today’s lowest at 6 stores, shipping included, before sales tax. How our method works →
Where we check prices
We read prices every day at most stores, from their product feed or web store, and Amazon’s through price services such as Keepa. We check them for errors and keep them, so you can see what a price did over the last 90 days.
- Amazon.com · United States
- Dreame (brand store) · United States
- iRobot (brand store) · United States
- MOVA (brand store) · United States
- Narwal (brand store) · United States
- Roborock (brand store) · United States
Which product test sources we take into account
Our ranking is a consensus of the positions in tests from, among others:
How we combine those positions, and why we never average scores, is on the method page.