Narwal Flow 2 vs Roborock Saros 20: Specs and Differences

Roborock rates the Saros 20 at 36 kPa (36,000 Pa) of suction, 5 kPa above the Narwal Flow 2's 31 kPa, but the Flow 2 is listed as the quieter robot. That mix of trade-offs defines this narwal flow 2 vs roborock saros 20 comparison. Both are self-emptying robot vacuum and mop combos with hot-water mop washing. The narwal flow 2 counts on a rolling track mop and a large dock bag, while the Saros 20 has a slimmer body and a higher stated threshold-climbing ability.

Narwal Flow 2 vs Roborock Saros 20 at a glance

• Suction: Saros 20 lists 36,000 Pa; Flow 2 lists 31,000 Pa. Both are manufacturer figures, and Pa ratings are not a measure of real-world pickup.
• Height: Saros 20 is lower (3.14 in) than the Flow 2 (3.74 in), which matters under low furniture.
• Mop design: Flow 2 uses a FlowWash rolling track mop; Saros 20 uses rotating mop pads with a FlexiArm that extends toward edges and corners.
• Dock: Flow 2 lists a 2.5 L dust bag and up to 120 days between emptying (the maker says 90 days for homes with pets). Saros 20 lists up to 65 days.

Specs side by side

Spec	Narwal Flow 2	Roborock Saros 20
Type	Robot vacuum and mop, self-emptying base	Robot vacuum and mop, self-emptying and self-cleaning dock
Maximum suction (manufacturer)	31,000 Pa	36,000 Pa
Robot height	3.74 in (95 mm)	3.14 in (79.8 mm)
Robot footprint	about 14.3 x 13.8 in (363.5 x 351 mm)	about 13.9 x 13.8 in
Robot weight	about 11 lb (5 kg)	about 11.1 lb (5.05 kg)
Mop	FlowWash rolling track mop	Rotating mop pads, FlexiArm
Hot water	Mop washing up to 212 F (100 C) at the base	Up to 212 F (100 C) in RockDock
Dock emptying interval (maker)	Up to 120 days (90 with pets)	Up to 65 days
Voice control	Alexa, Siri, Google Assistant	App and voice control
Colors	White, Black	Black shown on maker page

Suction, noise and battery: the numbers that differ

Beyond the 5 kPa suction edge for the Saros 20, two catalogue figures point the other way. Noise is listed at 56.5 dB for the Flow 2 and 63 dB for the Saros 20, a 6.5 dB difference in the Narwal's favor. Roborock's US pages do not publish a noise figure; one source shows 63 dB while another source shows 64 dB, so treat the gap as approximate. On battery, the Flow 2 has 7.0 Ah against 6.4 Ah for the Saros 20, which is also not on Roborock's US pages.

We leave runtime out. Sources show 200 minutes for the Saros 20 in one place and 190 in another, and Narwal's page gives lab cleaning times rather than a single figure.

Mop design and docks

The Flow 2 mops with a rolling track, which Narwal calls FlowWash, and the maker lists 7 to 12 N of downward pressure. The mop is washed at the base station and dried with warm air. The base can optionally connect to plumbing for automatic refill and drainage.

The Saros 20 uses rotating mop pads and a hot-water self-cleaning RockDock. Roborock says its FlexiArm extends the side brush and mop into corners and edges, and that the robot detects dirt and re-washes. Those are manufacturer claims, and neither company's page gives independent test results.

If you want plumbed refill and drainage, check which dock version you are buying. The options differ by model and bundle, and the product pages for the saros 20 and Flow 2 are the place to start.

Carpets, thresholds and low furniture

• Carpet: the Flow 2 lifts its mop about 0.4 in (10 mm) on carpet, and Narwal lists CarpetFocus detection. Roborock says the Saros 20 adjusts for pile up to 1.18 in, and that setting must be enabled in the app.
• Thresholds: Roborock rates the Saros 20 at up to 3.46 in for a double-layer threshold (1.77 in + 1.69 in) under its test conditions. We found no comparable figure on Narwal's page.
• Low furniture: Roborock says the Saros 20 navigates down to 3.13 in. Narwal says the Flow 2's 3.74 in height lets it fit under beds and sofas. Measure your clearance first: a 0.6 in difference can decide it.
• Obstacles and pets: the Flow 2 uses dual cameras for AI obstacle avoidance. The Saros 20 uses StarSight 2.0 with 3D sensors and an RGB camera. Both brands make claims about pet waste and cable avoidance that we have not verified.

Which one should you choose?

The specs point toward these leanings:

• Consider the Saros 20 if you have low furniture, raised thresholds or mixed flooring and want the higher suction rating and a lower body.
• Consider the Flow 2 if you value the rolling mop, a lower listed noise level, a bigger bag in the dock with longer intervals between emptying, or want plumbing options.

Drawbacks to weigh: both are flagship-tier robots with large docks, so check your space. Narwal's US page we checked lists no standard warranty term, only a paid one-year extended plan (Narwal Care), while Roborock describes a 1-year limited warranty tied to its extended option, so read the terms before buying.

To see how current prices compare, open the offers section on each model's page. You can also compare vacuum brands from other brands, or browse Narwal's lineup and Roborock robot vacuum deals to see what else each brand sells.

Narwal's Flow 2 is also set against Roborock Saros 10R and the Roborock Qrevo Curv 2 Flow in separate pages.

Noise is one of the figures that differs here; our guide to how loud a vacuum cleaner is covers how to read ratings, and Narwal against Roborock overall compares the two brands.