RELEASED 2019.07REASSESSED 2026.08.07

Ecovacs

Ecovacs Winbot 920

Name: Ecovacs Winbot 920
Brand: Ecovacs

Four-stage cleaning path provides methodical coverage without real-time path planning. Wired design is straightforward; entry-level positioning relative to current cordless models such as the W2 Omni and W2 Pro Omni.

Price$349 list priceRetail price not tracked

Autonomy Ladder

Why Level II.

One five-rung scale, every category, from acting only on command to working unsupervised anywhere.

VGeneralized AutonomyAny task, any setting. No consumer robot has reached it.
IVEnvironmental AutonomyCopes with everyday clutter and frees itself, shown by independent testing.
IIIConditional AutonomyFinishes whole jobs in familiar spaces; struggles at the edges.
To reach Level IIIMost sessions finish without intervention. Rescue is occasional, not routine.
IIAssisted AutonomyThis robot

Ecovacs Winbot 920 runs preset routines on its own, and the owner is its recovery system.

Navigation and control

Onboard path traversal across the pane; the four-stage sequence (wipe, scrape, scrape, wipe) is the pad process, not a movement pattern
Why this level
- Classified Level II, Assisted Autonomy.
- The robot works a pane on its own once it is placed and tethered, but the operator sites it, secures the safety tether, and takes it off the glass at the end or when the back-up battery warns.
- The four-stage sequence is the pad process applied at each pass, not the movement pattern, and spray volume does not vary with how dirty the glass is.
- Path-planning behavior for this generation is not verified against a live Ecovacs source.
Autonomy dimension 30 / 100 · 2 sources reviewed
IManual AutomationOne action on command; no independent operation.

How we assign a level →

Human Readiness

Discontinued.

One question: what does buying this robot today walk you into? The state is computed from the record, and recomputed daily.

DiscontinuedThis robot

Ecovacs Winbot 920 is discontinued. Remaining listings are old stock at uncertain prices, which no buying-today tier describes.

Listings under Availability are shown for reference, not as a purchase path.

On the record

Released July 2019; since discontinued
2 sources reviewed

The scale, for reference

Ready NowAssessed, with a clean record on file. A successor may be shipping; the page says so when it is.
New to MarketOn sale under 90 days; the ownership record is still forming.
WaitA successor is announced and has not shipped; re-read the decision when it arrives.
Known IssuesDocumented problems stand on the record; read the case before buying.

How we assess readiness →

Robovations Score

How this number was reached

54of 100

LimitedAt or above 13% of the 436 robots we scoreand 29% of the 21 scored robot window cleaners

DeficientLimitedCapableStrongExemplary

What moved itpoints gained or lost against a typical robot

Carried by

Edge-case recovery65+1.3

Held back by

Routine maintenance25−5.0
Support longevity30−3.2
Field failure rate56−2.2

Capability40% of the score64What it does without you.

Task completion16% of the score60

Evidence

Techtest's hands-on review reports fingerprints, soot, dust and pollen come off in a near-perfect, streak-free pass, but baked-on dirt and insect residue are too hard for it, and 'you must simply expect that the edges are not cleaned'. Testbericht.de's summary of two magazine tests puts a figure on that border: roughly 3 cm at the pane edge is left untreated, so a person finishes every frame by hand.

Coverage and navigation10% of the score72

Evidence

PC-WELT's test found the robot travels the entire window surface on its own and briskly, on inside and outside faces alike, and verified on a frameless mirror that it detects the end of an unframed pane flawlessly. A guidaacquisti review collected by Testseek notes it 'resumes cleaning from the point of interruption' but 'does not always return to the starting point at the end of cleaning'.

Edge-case recovery10% of the score65

Evidence

PC-WELT reports it never fell off at any point during the whole test, and Techtest notes the onboard battery exists only as backup power so the robot survives a brief power cut without dropping. Against that, on a roof window PC-WELT found it clings but 'only judders back and forth' without cleaning and without reporting a fault, leaving the tester to drive it manually from the app.

Operating envelope4% of the score60

Evidence

Testberichte.de reports that although Ecovacs claims all glass surfaces including sloped roof windows, users say it does not take up work at all on horizontal glass such as patio roofs, and rates cleaning performance only mid-field. Testbericht.de adds that mains operation removes any runtime limit, but at 4.2 meters the cable 'could reach its limits in many areas', so coverage depends on an outlet close to the window.

Dependability40% of the score53Whether it keeps doing it.

Field failure rate16% of the score56

Evidence

Six-plus years of owner field reports with a stable baseline and no recall or systemic defect, set against one documented job-stopping wear mode: the maintenance record specifies replacing the vacuum motor assembly when suction drops below specification, typical at the four to five year mark under weekly use, at roughly 70 dollars on a 349 dollar machine. That is a job-stopping mode near end of expected service life, repairable at proportionate cost. Independent evidence is owner reports and forums only, with no press or longitudinal source, so this also sits under the retail-review ceiling.

Software stability14% of the score65

Evidence

Updates ship. The unit pairs with ECOVACS HOME over Bluetooth with no separate remote needed, and that platform demonstrably delivers model-specific firmware to Winbot hardware. What is missing is any account of this model's updates: the only source is a generic vendor support portal with no model-specific changelog, and no independent report describes what any release changed. No owner reports a regression. That Ecovacs has taken the product page down bears on how long the channel stays open, which is a support commitment and is carried there rather than here. Silence in both directions, scored as silence.

Support longevity10% of the score30

Evidence

Production ended around 2021, the product page has been removed and the record states manufacturer support for the model is limited, with no published parts window or end-of-support date. Against that, the parts chain is unusually legible for a discontinued unit: pads at 18 to 22 dollars, intake filters at 8 to 10 dollars and a user-replaceable suction motor assembly at roughly 70 dollars are all named with prices.

Ownership burden20% of the score38What it asks of you.

Routine maintenance12% of the score25

Evidence

The heaviest schedule of the six window records: weekly pad and spray-jet rinse plus pad inspection, bi-weekly compressed air through the motor intake ports and a listening check on the motor, monthly vinegar soak of the jets and a power-cable inspection, bi-monthly intake filter, and periodic pad and motor service. On top of that, each pane costs a pad fitting, a carabiner fastened to a firm railing, a four-meter cord routed from an indoor socket, a hand placement and a hand retrieval.

Consumables8% of the score57

Evidence

Pad cadence is genuinely long for the category at four to five months per pair at 18 to 22 dollars, which is far better than the 880's four to six weeks. It is offset by a bi-monthly motor intake filter at 8 to 10 dollars and a suction motor assembly at roughly 70 dollars around year four or five, putting recurring spend near 40 percent of purchase price a year on a 349 dollar machine. No part is a proprietary cartridge.

middle half of the databaseits medianthis robot

Reported, not scoredneither measures how well the robot works

Five-year cost$1,109

349 dollars MSRP plus roughly 270 dollars of pads at the stated four to five month cadence, 270 dollars of bi-monthly intake filters, 150 dollars of cleaning solution and one 70 dollar suction motor assembly inside the five-year window at the record's stated four to five year interval. No subscription and no dock.

Data postureCloud-optional

Full core function without an account; cloud adds convenience.

What leaves the homeNot documented

Read the full methodology →

FIT CHECK

Will the Ecovacs Winbot 920 work on your windows?

Describe your windows using the controls. Each choice reads the spec sheet for you, flagging where the Ecovacs Winbot 920 is built for your space and where it isn’t.

Window style

Frame style

Building height

Power preference

See every window cleaner suited to these conditions

A classification of fit for the conditions you set, not a recommendation. Verdicts describe engineering design intent, not test results.

SPECIFICATION

The full spec sheet.

Priced near the category median, with every figure charted against the category below.

Dimensional drawing

Key specificationsManufacturer-published

Footprint: 10.6 × 10.6 in · 3.5 in tall
Weight: 2.9 lbs
Backup battery runtime: 30 min•
Power type: Mains-corded with backup battery•

Where it lands · ranked across 27 robot window cleanersThis robotMedianTypical range

Adhesion2,800Pamode not stated

2,800 Pa10,000 Pa

Bottom of range

Price$349

$150$850

Near median

Noise67dB

63 dB75 dB

Near median

Weight2.9lbs

1.3 lbs4.8 lbs

Near median

Position shows where the figure sits across the tracked category, not a quality judgment. The vacuum holding the robot on the glass, not cleaning power. The figure has no standard test method, so it is comparable only within a brand and generation.

Official referencesProduct page

OWNERSHIP

Living with it.

Six years of stable operation; suction motor degradation is predictable; no major design flaws or recalls documented.

Owner reports from 2019 onwards document consistent performance with gradual suction loss by 4-5 year mark. No major firmware regressions or mechanical failures beyond routine wear. Refurbished units show similar longevity when properly maintained. Mechanical simplicity (no rotating mechanisms) contributes to reliability.

Owner effort~40 minhands-on per month

Consumables$55replaceable parts / yr

Reliability trend Stableowner-reported arc

What goes wrong · not yet documented independently

The independent record is still forming. Failure modes are listed once an outside source reports them.

Upkeep routine

Weekly52×/yr

Rinse cleaning pads and spray jets under tap water; inspect pads for fraying or cover damage. · Clean motor intake ports with compressed air or soft brush; test suction motor sound for consistency.

Monthly12×/yr

Deep-clean spray jets by soaking in distilled vinegar if mineral spray residue visible; inspect power cable for insulation damage. · Replace motor intake filter (~$8-10); monitor suction grip as replacement interval; accelerated wear indicates intake blockage.

Seasonal4×/yr

Replace cleaning pads (~$18-22 per pair); check power connector for corrosion or looseness.

As neededno fixed schedule

Replace vacuum motor assembly if suction drops below specification (~$70, typical at 4-5 year mark with weekly use).

Cost over time · past the sticker

PurchaseRunning cost

Year 1

$404

Year 3

$514

Year 5

$624

$349 to buy, then about $55 a year for the replaceable parts below. Over three years that is roughly $165 past the sticker price. Excludes electricity and any repairs.

What you replace

Mop padEvery 4-5 months$18–22
FilterBi-monthly$8–10

Replacement cadence from the maintenance schedule; prices shown where the source documents them.

Safety notes

CautionElectrical hazard in wet environment: Outdoor power source must have GFCI protection. Keep cable and connector dry. Wet insulation creates shock risk in spray-heavy conditions.

NoteGrip dependency on suction only: Robot relies solely on vacuum suction for glass grip. Inspect motor suction monthly; use external secondary tether for heights above 20 feet.

RECORD

How the assessment has moved.

Every announcement, release and reassessment behind the current classification.

Coming soon

Just launched

Active updates

Settled

Discontinued

Aug 2026 · AssessmentRobovations Score revised 55 → 54
Aug 2026 · AssessmentRobovations Score rescored under v4.2: 62 → 55
Jul 2026 · AssessmentRobovations Score revised 60 → 62
Jul 2026 · AssessmentRobovations Score recorded at 60 of 100
Mar 2025 · NewsWinbot 920 cleared from major retail channels as W2 Omni expands distribution

Common questions

What people actually ask.

5 answered

OperationHow does the Winbot 920 differ from the newer W1 Pro?

The 920 (2019) runs from a mains adapter that Ecovacs requires to be used indoors, and it pairs with the ECOVACS HOME app over Bluetooth. The W1 Pro (2022) is cordless and costs more. App control is not the dividing line between them; cord reach is. Ecovacs distributor listings give the 920 a short power cable, on the order of four meters, so it works within about one room’s reach of an inside socket.

OperationCan I use the Winbot 920 on second-story windows?

Yes, if Ecovacs’ tethering instruction is followed exactly. Ecovacs specifies fastening the supplied safety tether with the carabiner to a firm, safe metal railing, and confirming the robot is properly tethered to a safe position before it goes on the glass; the manual permits outside windows only on that condition. The plug and power adapter must be used indoors, which Ecovacs states directly, so running the adapter to an exterior outlet is against the instruction, not a way to gain reach. Ecovacs publishes no height ceiling and no story limit for this model. It does publish three limits that decide whether a job is safe: do not run it in whole gale storms or force-10 winds, do not use it where the altitude exceeds 2,000 m (6,162 ft) above sea level, where thinner air weakens the suction seal, and do not use it on a window with a frame smaller than 5 mm.

OperationWhat happens if the power is cut while it is on the glass?

It stays on the glass. Ecovacs specifies that the appliance is plugged in while it cleans and that an onboard back-up battery charges during use; if the plug is pulled or household power fails, that battery keeps it attached. Ecovacs states for the WINBOT line that the back-up can hold it on the window for more than 30 minutes. The status indicator turns solid red when the back-up runs low, and the instruction at that point is to take the robot off the window. It does not park itself and it does not come down on its own.

OperationWhat cleaning performance should I expect on mineral-spotted glass?

The four-stage sequence is a pad process, wipe then scrape then scrape then wipe, applied at a fixed spray volume rather than varied by how dirty the glass is. Heavy mineral deposits need pre-soaking or a second run; the cycle cannot be adjusted mid-pass.

OperationIs the Winbot 920 still available for purchase?

Original production ended circa 2021; units are primarily available as refurbished stock or used inventory. Ecovacs has taken the product page down and manufacturer support for the model is limited.

Cite / Embed

Reference the Ecovacs Winbot 920 classification.

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Robovations. "Ecovacs Winbot 920: Autonomy Level II (Assisted Autonomy)." Autonomy Ladder™, assessed August 2026. https://robovations.com/robots/ecovacs-winbot-920/

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Where to next

Three ways to keep going.

For evaluators

Compare with a peer.

See the Ecovacs Winbot 920 and HOBOT 2S side by side: autonomy level, Robovations Score, readiness, and price. Classification, not a verdict.

See the full comparison

Or compare with HUTT C6, Hobot R3, HOBOT 388 Ultrasonic.

For browsers

See every Level II.

Every robot we’ve classified at assisted autonomy. Sorted by readiness, score, and price. Filter by category, manufacturer, or release date.

Browse the database

Updated weekly with new entries and reclassifications.

Ecovacs Winbot 920

Will the Ecovacs Winbot 920 work on your windows?

The full spec sheet.

Living with it.

How the assessment has moved.

What people actually ask.