# Roborock Saros 20 Flow vs Roborock Saros 20 Sonic

As of Nov 4, 2026, the Roborock Saros 20 Flow costs $1,700 and the Roborock Saros 20 Sonic costs $1,700. The Roborock Saros 20 Flow has a published review score and ranks #38 in our robot vacuums ranking; the Roborock Saros 20 Sonic is not scored yet. Pick the Roborock Saros 20 Flow for hard floor homes with tall thresholds. Pick the Roborock Saros 20 Sonic for homes with tall thresholds and lots of carpet.

Prices checked Nov 4, 2026. HTML version: https://robotsforthat.com/vs/roborock-saros-20-flow-vs-roborock-saros-20-sonic/

## Side by side

| | Roborock Saros 20 Flow | Roborock Saros 20 Sonic |
|---|---|---|
| Price | $1,700 | $1,700 |
| 3 year cost | $1,777 | $1,777 |
| Our score | 6.4/10 | Not scored yet |
| Rank in Floors | #38 | #105 |
| Status | on sale | on sale |
| Warranty | 1 year (Roborock US store) | 1 year limited (Roborock US store) |
| Suction | 36,000 Pa claimed (Roborock); House Digest could not verify it but estimated floors came out about 90% clean | 36,000 Pa claimed (Roborock); PC-WELT said it could not verify the figure in home testing |
| Navigation | Retractable LiDAR (RetractSense) that lowers under furniture, plus VertiBeam side structured light (Roborock) | RetractSense retractable LiDAR (Roborock); PC-WELT mapped about 103 m² in about 12 min |
| Obstacle avoidance | Reactive AI with structured light and RGB camera, 300+ object types, objects down to 3 cm wide and 3 cm tall (Roborock); House Digest saw it get lost once | Reactive AI 3.0 with tri laser structured light, RGB camera and VertiBeam side laser (Roborock); Vacuum Wars scored 19 of 24 against a 16 average |
| Mopping | SpiraFlow 2.0 roller mop, up to 240 rpm, 15 N pressure, 16 pressurized outlets, extends up to 44 mm for edges and lifts up to 15 mm on carpet (Roborock) | Extendable VibraRise 5.0 flat vibrating pad, about 4,000 vibrations per min and 14 N pressure, lifts over carpet (Roborock); Vacuum Wars combined mopping score 15.8 against a 20.3 average |
| Self empty | Yes, auto empty into a bag, up to 65 days without manual emptying (Roborock); bag size not listed | Yes, disposable bag in the dock (Roborock); PC-WELT cites a maker claim of up to 65 days per bag |
| Dock features | Roller wash with water up to 212°F, 145°F warm air drying, auto detergent dosing, warm water refill of the robot tank (Roborock) | Mop washing with water up to 212°F, warm air drying at about 131°F, auto detergent dosing (Roborock, PC-WELT) |
| Runtime | Not listed in minutes; Roborock says up to 200 m² per charge in standard vacuum and mop mode, 6,400 mAh battery, 150 min full charge | Up to 180 min vac and mop at Balanced (Roborock); Vacuum Wars estimated about 1,225 sq ft per charge; PC-WELT used 103 min for 70 m² on turbo settings |
| Height | 3.54 in robot height (Roborock landing page); the store page lists 89.8 mm | 79.8 mm, about 3.1 in, with the LiDAR retracted (Roborock) |
| Pet hair | House Digest said heavy pet fur left no hair balls on the dual anti tangle brushes | Vacuum Wars measured 78% pet hair pickup against an 82% average, with 0% wrap on 7 in hair |
| App | Roborock app; works with Alexa, Siri, Google Home and Matter; built in Hello Rocky voice assistant (Roborock) | Roborock app; Matter enabled and works with Alexa, Siri and Google Home (Roborock) |
| Threshold | Double layer thresholds up to 3.46 in (88 mm) with AdaptiLift Traverse 3.0 (Roborock); House Digest saw it clear a baby gate with a thud | Roborock claims 8.8 cm on stepped double thresholds and 4.5 cm single sills; Vacuum Wars measured 57 mm; PC-WELT saw about 5 cm single thresholds in practice |
| Noise | No dB figure from Roborock or the reviews we read; House Digest says Carpet Boost is the loudest mode | PC-WELT measured about 55 to 58 dB(A) standard, 68 dB(A) max suction and 70 dB(A) while emptying (phone app at 1 m) |
| Dustbin | n/a | 228 ml robot bin (Vacuum Wars), against a 377 ml average |
| Best for | hard floor homes with tall thresholds | homes with tall thresholds and lots of carpet |
| Skip if | you are on a budget or need spotless corners | mopping sticky stains is your main job |

## What reviewers found

### Roborock Saros 20 Flow

- House Digest (9/10): Floors came out about 90% clean with some crumbs left in corners. Mopping fully removed ketchup and barbecue sauce and left wood almost dry. It cleared a baby gate but got lost once and had underwhelming edge cleaning. [Source](https://www.housedigest.com/2284562/roborock-saros-20-flow-review/)
- EFTM (92%): Australian review gave vacuuming 93%, mopping 93%, app 92% and features 93%. It cleaned dried jam and tomato sauce, needed two passes for Vegemite and struggled with crumbs near cabinets. Charging was slow. [Source](https://eftm.com/2026/09/review-roborock-saros-20-flow-thge-best-all-rounder-281056)

### Roborock Saros 20 Sonic

- Vacuum Wars (3.81 Vacuum Wars stars): 92% carpet deep clean (78% average), 0% hair wrap, 78% pet hair pickup (82% average), 19 of 24 obstacles avoided, 57 mm threshold climb, about 1,225 sq ft per charge. Dried stain score 62 against a 108 average, the main weakness. [Source](https://vacuumwars.com/roborock-saros-20-sonic-review/)
- PC-WELT: Editors' Choice and named its new number one in the premium segment. Measured about 55 to 58 dB(A) in standard mode, cleaned 70 m² in 103 min on turbo settings, and handled single thresholds of about 5 cm in practice. Less effective than roller mops on dried dirt. [Source](https://www.pcwelt.de/article/3156821/wischroboter-roborock-saros-20-sonic-test.html)

## Questions buyers ask

### Which is better, the Roborock Saros 20 Flow or the Roborock Saros 20 Sonic?

The Roborock Saros 20 Flow has a published review score and ranks #38 in our robot vacuums ranking; the Roborock Saros 20 Sonic is not scored yet. Pick the Roborock Saros 20 Flow for hard floor homes with tall thresholds. Pick the Roborock Saros 20 Sonic for homes with tall thresholds and lots of carpet.

### What is the difference between the Saros 20 Flow and the Saros 20 Sonic?

Suction: 36,000 Pa claimed (Roborock); House Digest could not verify it but estimated floors came… on the Saros 20 Flow, 36,000 Pa claimed (Roborock); PC-WELT said it could not verify the figure in home testing on the Saros 20 Sonic. Navigation: Retractable LiDAR (RetractSense) that lowers under furniture, plus VertiBeam side… on the Saros 20 Flow, RetractSense retractable LiDAR (Roborock); PC-WELT mapped about 103 m² in about 12 min on the Saros 20 Sonic. Obstacle avoidance: Reactive AI with structured light and RGB camera, 300+ object types, objects down to 3… on the Saros 20 Flow, Reactive AI 3.0 with tri laser structured light, RGB camera and VertiBeam side laser… on the Saros 20 Sonic.

Full reviews: [Roborock Saros 20 Flow](https://robotsforthat.com/robot/roborock-saros-20-flow/index.md), [Roborock Saros 20 Sonic](https://robotsforthat.com/robot/roborock-saros-20-sonic/index.md)