Eufy
eufy Omni S2
- Autonomy
- IVEnvironmental
- Score
- 76/100Strong
- Readiness
- Ready Now
- Price
- $1,599.99list
Comparisoneufy Omni S2 and Roborock S8 Max Ultra with Refill & Drainage System
- Autonomy
- IIIConditional
- Score
- 72/100Strong
- Readiness
- Ready Now
- Price
- $1,699.99list
Up to three
Autonomy Ladder
- IManual
- IIAssisted
- IIIConditional
- IVEnvironmental
- VGeneralized
All robot vacuums. Every figure below is placed against the whole class, so a gap can be read against how much the class itself varies.
Where each one suits you.
The conditions each robot was assessed against, side by side. Rows marked in gold are where these machines genuinely differ.
| Condition | eufy Omni S2 | Roborock S8 Max Ultra… |
|---|---|---|
| Home size | ||
| Under 1,500 sqft | GoodCapable but exceeds compact-home needs; premium automation goes underused in smaller spaces. | GoodRoborock lists up to 180 minutes of runtime, and the dock handles water without refills. |
| 1,500 – 3,000 | GoodCovers multi-floor homes efficiently; 130-minute runtime sufficient with resume capability. | GoodVacuum Wars saw nearly perfect coverage, and plumbing removes tank refills on long runs. |
| Over 3,000they differ | GoodDesigned for large spaces; scheduled multi-zone runs or persistent operation handles coverage. | DependsVacuum Wars rated its navigation efficiency about average, and no large-home test was found. |
| Primary floors | ||
| Hard floors | GoodCore design and roller-mop system optimized for hard-floor homes. | GoodVacuum Wars found near-perfect debris pickup and strong stain removal on hard floors. |
| Low / medium pile | Good30,000 Pa and roller-mop suit low carpet; hot-wash drying reduces moisture accumulation. | GoodVacuum Wars found carpet pickup nearly perfect, and pads lift 20 mm to stay dry. |
| High pile / shagthey differ | PoorSuction and low-pile-optimized mop poor match for shag or high-pile; coverage suffers. | DependsVacuum Wars rated its airflow and carpet deep clean below average, and no high-pile test was found. |
| Mopping needs | ||
| Vacuum only | GoodStrong vacuum; the mop lifts or detaches when not needed. | GoodStrong vacuum; the mop lifts or detaches when not needed. |
| Light mopping | GoodActive mopping system covers routine floors easily. | GoodActive mopping system covers routine floors easily. |
| Frequent mopping | GoodPressure or rotating mop with self-wash is built for frequent mopping. | GoodPressure or rotating mop with self-wash is built for frequent mopping. |
| You want to… | ||
| Empty bin myself | GoodDock automation handles most consumables, but water-line inspection and gasket checks require quarterly attention. | GoodOwners who expect upkeep will find the dock already handles water, dust and pad washing. |
| Empty occasionally | GoodAutomated dock cycles reduce hands-on work; seasonal dock service needed. | GoodRemaining tasks are dust bag changes, detergent refills every few months and replacing worn pads. |
| Set-and-forgetthey differ | Depends12-in-1 dock minimizes consumable touch, but heating-element and water-seal failures may demand repair intervention. | GoodPlumbed refill and drainage plus auto-empty, washing and drying leave only bags and detergent. |
A robot being poor for a condition is a fact about fit, not a fault. “Depends” means the record names a limit worth reading, not that the answer is unknown.
What the score is built from.
Nine inputs across three pillars, each weighted as shown and each scored so more is better. A robot can lead on one and trail on another, which is the point of showing them apart.
Capability
Task completion16% of score
Does it finish the job it is sold to do, unattended
8074
- eufy Omni S280
- Roborock S8 Max Ultra with Refill & Drainage System74
18median 72 across 433 scored robots100
Coverage and navigation10% of score
Does it work the whole area, and hold that between runs
7678
- eufy Omni S276
- Roborock S8 Max Ultra with Refill & Drainage System78
0median 70 across 421 scored robots100
Edge-case recovery10% of score
Does it recover from the failures its category presents
2568
- eufy Omni S225
- Roborock S8 Max Ultra with Refill & Drainage System68
18median 52 across 320 scored robots100
Operating envelope4% of score
How far conditions can vary before performance drops
7270
- eufy Omni S272
- Roborock S8 Max Ultra with Refill & Drainage System70
28median 68 across 397 scored robots100
Dependability
Field failure rate16% of score
Documented hardware failures per owner-year
8570
- eufy Omni S285
- Roborock S8 Max Ultra with Refill & Drainage System70
6median 70 across 359 scored robots100
Software stability14% of score
Whether updates fix more than they break
6565
- eufy Omni S265
- Roborock S8 Max Ultra with Refill & Drainage System65
15median 65 across 342 scored robots100
Support longevity10% of score
Committed parts, service and updates, with dates
8562
- eufy Omni S285
- Roborock S8 Max Ultra with Refill & Drainage System62
0median 62 across 429 scored robots100
Ownership burden
Routine maintenance12% of score
Hands-on time it asks for in normal operation
8188
- eufy Omni S281
- Roborock S8 Max Ultra with Refill & Drainage System88
22median 67 across 434 scored robots100
Consumables8% of score
Parts that must be bought to keep it working
4964
- eufy Omni S249
- Roborock S8 Max Ultra with Refill & Drainage System64
8median 69 across 434 scored robots100
How far apart is a long way?
A number only means something next to the spread it sits in. Each track is the real range across every classified robot in the class, with the median marked.
Price217 with a published figure
$1,599.99$1,699.99
- eufy Omni S2$1,599.99
- Roborock S8 Max Ultra with Refill & Drainage System$1,699.99
$160median $799.99$2,599
Suction (mode not stated)210 with a published figure
30,000 Pa8,000 Pa
- eufy Omni S230,000 Pa
- Roborock S8 Max Ultra with Refill & Drainage System8,000 Pa
1,000 Pamedian 10,000 Pa42,000 Pa
Runtime187 with a published figure
130 min180 min
- eufy Omni S2130 min
- Roborock S8 Max Ultra with Refill & Drainage System180 min
60 minmedian 180 min360 min
Height232 with a published figure
3.9 in3.8 in
- eufy Omni S23.9 in
- Roborock S8 Max Ultra with Refill & Drainage System3.8 in
2.6 inmedian 3.8 in7.8 in
Not compared, because fewer than two of these robots carry a published figure: Charge time, Noise, Weight.
What the numbers leave out.
Written on each record, and the only thing here every robot on the site carries.
The trade-off
What each design gives up to be good at what it is good at.
eufy Omni S2
12-in-1 dock: solves every consumable task (empty, wash, dry, dispense), but spreads failure risk across electronics, pumps, tanks and thermal systems that need repair.
Hot-water washing with hot-air drying: eufy heats the wash water (70 C, listed as 140 F in US material) and dries the roller with 131 F air, which is what keeps a mop from souring between runs. It is also close to the whole of the $1,599 argument, and stations that dry with unheated air address the same problem more slowly for less.
Roborock S8 Max Ultra with Refill & Drainage System
The dock takes over every water chore, and in exchange it needs plumbing work before its first run.
Structured-light obstacle avoidance keeps a camera out of the home; Vacuum Wars found the camera model avoided obstacles better.
Who each one is wrong for
Stated by the record itself. A robot being wrong for a household is a fact about fit, not a fault.
eufy Omni S2
- Deep shag beyond the mop's lift
- The roller mop lifts 28 mm clear of the floor when carpet is detected, more than double the 13 mm on the S1, so ordinary and thick pile are isolated automatically. Pile deeper than that lift is the case the mechanism does not cover.
- Budget-conscious buyers
- $1,599 MSRP puts this at the top of the category, and consumables are the other half of the figure: eufy suggests a new roller mop every two months at $26.99, roughly $160 a year before brushes, filters and bags.
- Homes with limited space near a power outlet
- The 12-in-1 station is large (footprint roughly 24in x 20in) and needs a dedicated mains outlet and clear floor space. It does not need a water line or a drain: the 3.0 L clean and 2.0 L dirty tanks are hand-filled and hand-emptied, which is a trip to the sink every few runs instead.
Roborock S8 Max Ultra with Refill & Drainage System
- Renters or homes without a nearby water line and drain
- The dock must connect to a water supply and a drain within Roborock's stated distances, which many layouts cannot provide.
- Buyers who want a camera for obstacle recognition
- It uses structured light rather than a camera, and Vacuum Wars found the camera-equipped S8 MaxV Ultra avoided obstacles better.
- Dock sites behind a threshold over 2 cm
- Roborock's installation guidance warns against thresholds, tracks or steps above 2 cm between the dock and the cleaning area.
- Buyers who need an independent test of the plumbed version
- Vacuum Wars tested the standard-dock S8 Max Ultra and said it had not reviewed the refill and drainage variant.
What stays your job
The upkeep ownership hands back to you, whatever the autonomy level says.
eufy Omni S2
- Weekly: Refill the station’s 3.0 L clean water tank and empty the 2.0 L dirty tank; rinse the dirty tank rather than just tipping it.
- Monthly: Rinse the wash tray under the roller and clear hair from the roller brush and brush guard.
- Every 2 months: Replace the roller mop ($26.99), which is eufy’s suggested interval and the largest recurring cost on the machine.
- Every 3-6 months: Replace the filter set and the water tank filter; swap the side brushes when the bristles splay ($21.99 for two pairs).
- As needed: Replace the dust bag when the station reports it full, and the roller brush and brush guard when the brush is worn ($26.99).
- Before any long period unused: Empty both tanks and let the wash tray dry, so standing water does not sit in the station.
Roborock S8 Max Ultra with Refill & Drainage System
- As needed: Replace the 2.5 L dock dust bag; Roborock sells 6-packs.
- Every 3-6 months: Refill the 580 ml detergent tank, which Roborock says lasts over three months.
- As needed: Check the water inlet and drain connections for leaks, per Roborock’s installation notes.
- As needed: Replace mop cloths and edge mop cloths; Roborock’s US store sells both.
- As needed: Replace the washable filters and main brush pack, which Roborock’s US store sells for the S8 Max Ultra.
How much each of these is standing on.
Classifications rest on different depths of evidence. A pre-release assessment and a verified one are not the same kind of claim.
| Robot | Evidence status | Sources reviewed | Last assessed |
|---|---|---|---|
| eufy Omni S2 | Pending | 4 | Sep 2026 |
| Roborock S8 Max Ultra with Refill & Drainage System | Provisional | 5 | Sep 2026 |
Evidence status counts the sources behind a classification, not their kind. A high count can be maker documentation and price coverage, so read it as how much was reviewed rather than as independent testing. How we weigh evidence.
Keep going.
The full recordeufy Omni S2Specifications, evidence, the Fit Check in full, and every tracked change.
The full recordRoborock S8 Max Ultra with Refill & Drainage SystemSpecifications, evidence, the Fit Check in full, and every tracked change.Robovations classifies robots; it does not rank them. Nothing on this page is a recommendation, and no manufacturer influences a classification or its placement here.
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