RELEASED 2022REASSESSED 2026.09.06

Robomow

Robomow RK4000

Name: Robomow RK4000
Brand: Robomow

Wire-guided autonomy inside a perimeter the owner installs, trading systematic mapping for boundary infrastructure. Perimeter-first edging with randomized interior fill, rated for lawns up to 4,000 sq m and slopes to 45 percent, with a rain sensor the owner sets to either pause or keep cutting.

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 AutonomyHandles new obstacles and re-plans in real time; rare in consumer products.
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

Robomow RK4000 runs preset routines on its own, and the owner is its recovery system.
What it does on its own
- Operates autonomously within FM-defined perimeter without line-of-sight operator control.
- Handles moderate slope terrain with traction-based drive system.
- Dock-returns automatically when battery depletes.
- Programs weekly cutting schedule via mobile interface.
- Maneuvers around yard obstacles detected by bump sensors.
Why this level
- Wire-guided boundary system removes operator from direct control loop (L2 hallmark).
- Random coverage pattern and dock-return logic operate independently, but the perimeter is manually defined and requires seasonal oversight.
- Environmental response is limited to a rain sensor executing a preset the owner chooses; no dynamic path optimization occurs.
What holds it at Level II
- Boundary wire placement requires manual planning and seasonal inspection, limiting autonomous operation scope.
- Random coverage pattern does not optimize for obstacles, resulting in inefficient routes and potential entrapment.
- Weather response is limited to the rain sensor, which executes a preset choice of returning to base or continuing; the mower does not adapt its schedule to seasonal growth.
- Slope detection is passive (slip-based), not proactive, resulting in occasional loss-of-traction failures on edge cases.
Autonomy dimension 46 / 100 · 4 sources reviewed
IManual AutomationOne action on command; no independent operation.

How we assign a level →

Behind the classification

Sources we reviewed.

Provisional4 sources reviewed

Enough has been reviewed to classify, but gaps remain across source types.

Sources reviewed

Manufacturer documentation3 sourcesReviewed

Official RK4000 user manual and specification sheets.

Owner reports1 sourceOngoing

Robomow user forums and community discussions spanning 2+ years.

r/RobomowReddit · r/Robomow

Firmware release notes1 sourceReviewed

Firmware release notes covering scheduling and boundary-wire handling improvements.

RasenpflegekalenderRobomow

Also monitored, nothing listed yet

Press & video reviewsPending

Independent lawn-care equipment reviews evaluating performance and maintenance burden.

Longitudinal signalOngoing

Multi-season owner reports tracking reliability and seasonal maintenance patterns.

How we evaluate evidence →

Human Readiness

Ready Now.

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

Ready NowThis robot

Robomow RK4000 is on sale, assessed, and nothing on its record argues for waiting.
How this was derived
- Shipping past the first-90-day ownership window with a published assessment, no documented issues on record, and no announced successor.
Notes on the record
- Device is commercially available with retail distribution.
- One-time boundary-wire installation and seasonal blade replacement are standard lawn-mower maintenance.
- No integration complexity or software learning curve beyond typical mower apps.
- Ready for immediate deployment.
On the record
- Shipping since January 2022 · 56 months on the market
- Retail listings on file: Amazon
- No successor announced
- 4 sources reviewed
What would move it
A documented problem, an announced successor, or a withdrawn listing moves it out; the rating recomputes daily.
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

69of 100

CapableAt or above 63% of the 382 robots we scoreand 55% of the 88 scored robot lawn mowers

DeficientLimitedCapableStrongExemplary

Measured on 7 of the 9 inputs24% not counted

Our assessment did not establish an independent source for edge-case recovery, software stability on this machine, so those inputs are left out of the score rather than guessed at, and the rest re-weighted to fill the space. A gap in what we have been able to verify is not evidence against the robot. Where it reaches 30% of the rubric we publish no number at all.

What moved itpoints gained or lost against a typical robot

Carried by

Field failure rate81+1.8
Support longevity73+1.0
Task completion78+1.0

Held back by

Routine maintenance40−3.0
Coverage and navigation55−1.5

Capability40% of the score69What it does without you.

Task completion16% of the score78

Evidence

An RK4000 owner on roboter-forum writes 'Mähen tut er aber sehr gut' (it mows very well) with roughly 150 minutes of runtime according to the machine's own history log, and LawnStarter describes it as durable and easy to use across multiple programmed zones on lawns up to an acre. Once the perimeter wire is installed, the mowing job runs and docks with no per-run human step.

Coverage and navigation10% of the score55

Evidence

Lawn Love states it uses a random mow pattern behind a buried boundary wire, with four programmable starting points, two mowing zones and an 'escape mode' for narrow passages; smarthomeassistent.de's data sheet lists the navigation type as 'Chaos Navigation' with wire-based positioning and six zones. Coverage completes over enough run time rather than systematically, which is class normal for a wire-guided mower, with start points and zones as genuine coverage aids above bare random.

Edge-case recoverynot countedno source verified69

Evidence

Above the halt-and-report anchor because it attempts extraction before giving up: on physical entrapment it reverses and tries an alternate path, and only raises an alarm if it cannot free itself. A wire signal loss stops it and alarms rather than letting it continue without a perimeter, which is the safe behavior, and dock misalignment is reported as a specific fault. Held down because it cannot locate a wire break, entrapment sometimes needs a reboot, and slope detection is passive slip-based, producing occasional traction failures.

Operating envelope4% of the score70

Evidence

Lawn Love notes 'it doesn't have rain sensors, so be mindful of the weather. Cut quality declines in wet conditions,' while LawnStarter credits the broadest height range among robot mowers (0.8 to 4 inches), a floating deck that 'helps it handle uneven terrain' and inclines to 24 degrees. Broad terrain and grass-height envelope with wet weather as the one documented degradation.

Dependability40% of the score78Whether it keeps doing it.

Field failure rate16% of the score81

Evidence

Four and a half years on sale with owner reporting from 2024 to 2026, a Wirecutter appearance, and the record's statement that no systematic mechanical failures appear in the active user base. Four recurring modes are documented and all are owner-remediable at low cost: wire damage from frost heave, rodents or blade strikes at $5 to $25 and under an hour, dock contact corrosion in humid regions, blade dulling, and pattern entrapment. The dock corrosion arriving at one to two years is earlier than it should be.

Software stabilitynot countedno source verified74

Evidence

The record states firmware updates have progressively improved boundary-wire signal stability and dock-return accuracy across multiple versions over two-plus years, which is updates fixing rather than breaking, and no regression pattern is reported. It cannot go higher because the three sources filed under firmware notes are the Robomow homepage, a user guide PDF and a German lawn-care calendar, none of which is a changelog. App and RoboHome connectivity are also accessories rather than standard equipment on this model.

Support longevity10% of the score73

Evidence

The RK series is current in Robomow's lineup, with live product pages across regions, a published user guide and retail distribution, and the consumables are commodity items: wire, pegs and splices are generic and a break costs $5 to $25 in material. Those are commitments vendor material properly establishes. Two gaps hold it down: Robomow publishes neither a replacement interval nor a price for RK4000 blades, which is unusual for a current product, and no support term is published in years.

Ownership burden20% of the score50What it asks of you.

Routine maintenance12% of the score40

Evidence

Carries an after-every-use item plus a weekly item plus a monthly wire chore. Clear compacted grass from the deck and check for wrapping after each cut, check base station contacts weekly for debris and corrosion and confirm it is level and unobstructed, inspect the boundary wire monthly for damage, gaps and loose pegs, run a full continuity check annually, and reposition and clear the base seasonally. Blade condition is judged by inspection because no interval is published, which adds a recurring judgment call.

Consumables8% of the score66

Evidence

Held down by an information gap rather than a known expense: Robomow publishes no replacement interval and no price for the offset blades on the pendulum deck, so a buyer cannot compute annual cost at all, and the record says so twice. Boundary wire, pegs and splice connectors recur on top at $5 to $25 per repair incident. There is no subscription of any kind, and the wire consumables are generic rather than proprietary, which is what keeps this from scoring lower.

middle half of the databaseits medianthis robot

Reported, not scoredneither measures how well the robot works

Five-year cost$2,550

Middle of the range for robot mowers and reasonable per rated area, since 4,000 square meters is a large coverage rating. $1,999 at the low end of a $1,999 to $2,999 range that spans configurations, roughly $250 of blades across five years, an allowance for wire, pegs and splice repairs at the record's own $5 to $25 per incident, and one replacement battery pack. No subscription. The blade figure is an estimate rather than a calculation, because Robomow publishes neither an interval nor a price for them, and a buyer should also note that app and RoboHome connectivity are accessories on this model rather than included.

Data postureCloud-linked

Account required. Maps and telemetry leave the home; core function survives an outage.

What leaves the homeDocumented

The RK4000 collects operational telemetry (run time, blade hours, dock cycles) via cloud-connected mobile app. Manufacturer states that telemetry is encrypted in transit and stored with standard practices. No third-party sharing is documented, but privacy policy does not explicitly restrict future data use. Local mowing patterns are not retained on device; only summary statistics are uploaded.

On-device processingNo

Read the full methodology →

FIT CHECK

Will the Robomow RK4000 work on your yard?

Describe your yard using the controls. Each choice reads the spec sheet for you, flagging where the Robomow RK4000 is built for your space and where it isn’t.

Yard size

Terrain

Grass type

Boundary setup

See every robot mower 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 above the category median, with every figure charted against the category below.

Dimensional drawing

Key specificationsManufacturer-published

Footprint: 22.4 × 18.9 in · 8.7 in tall
Weight: 27.3 lbs
Battery: 178 Wh · Li-ion
Network: Cellular

Where it lands · ranked across 101 robot lawn mowersThis robotMedianTypical range

Runtime120min

30 min240 min

Near median

Price$1,999

$451$5,999

Near median

Noise65dB

50 dB82 dB

Above median

Charge time110min

30 min300 min

Near median

Weight27.3lbs

13 lbs134 lbs

Near median

Position shows where the figure sits across the tracked category, not a quality judgment.

Official referencesManufacturer support Manufacturer site

OWNERSHIP

Living with it.

Stable two-year cycles; boundary wire degradation and dock corrosion are climatic; blade dulling expected with use.

Firmware updates improved boundary-wire stability and dock-return accuracy. Primary failures are climatic (frost heave, corrosion) and consumable wear (blades). No systematic mechanical failures in active user base.

Owner effort~35 minhands-on per month

Consumables$140replaceable parts / yr

Reliability trend Stableowner-reported arc

What goes wrong · 4 documented · 0 self-recover

Common

Frost or chewing damageMower exits defined zone or enters no-mow areas after rupture

Owner fixWire replacement or splice; 30-60 minutes labor plus material

Common

Blade dulling in dense turfRagged cut and visible lawn damage if not replaced on schedule

Owner fixReplace blades every 3-6 months with soil-heavy use

Occasional

Dock contact corrosion and charge failureMower stranded in yard after 1-2 years in humid regions

Owner fixClean contacts or reposition dock for realignment

Occasional

Random pattern entrapment in long grassPhysically trapped by terrain variations algorithm cannot escape

Owner fixManual extraction and sometimes reboot required

Step-by-step fixesCutting Uneven or Scalping the Lawn?Keeps Getting Stuck on the Lawn?Not Following Its Schedule or Running at the Wrong TimesAll robot mower guides

Upkeep routine

Each useEvery cycle

Clear the cutting deck of compacted grass; inspect for wrapped grass or debris.

Weekly52×/yr

Check base station charging contacts for debris or corrosion; verify the station remains level and obstruction-free.

Monthly12×/yr

Inspect boundary wire for visible damage, gaps, or loose pegs.

Seasonal4×/yr

Recheck base station position, clear accumulated leaves from the charging area, and confirm cutting height as the lawn enters dormancy.

Yearly1×/yr

Perform a full boundary-wire inspection and continuity check.

As neededno fixed schedule

Check blade condition and replace when edges are rounded, chipped, or bent. Robomow publishes no fixed interval or price for RK4000 blades.

Cost over time · past the sticker

PurchaseRunning cost

Year 1

$2,139

Year 3

$2,419

Year 5

$2,699

$1,999 to buy, then about $140 a year for the replaceable parts below. Over three years that is roughly $420 past the sticker price. Excludes electricity and any repairs.

What you replace

BladesBy inspection

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

Safety notes

CautionRotating blade hazard during charging: Blades enclosed within deck but accessible at dock; keep children and pets away

NoteBoundary wire trip hazard if above-ground: Low-voltage signal is safe; bury 2-3 inches or use surface edge guides

CautionWet operation slip and electrocution risk: Unit should not operate in rain; moisture sensors disable in firmware 2024+

RECORD

How the assessment has moved.

Every announcement, release and reassessment behind the current classification.

Coming soon

Just launched

Active updates

Settled

Discontinued

Sep 2026 · AssessmentRecord status: Verified → Provisional
Aug 2026 · AssessmentRobovations Score revised 68 → 69
Aug 2026 · AssessmentRobovations Score revised 67 → 68
Aug 2026 · AssessmentRobovations Score rescored under v4.2: 64 → 67
Aug 2026 · AssessmentRobovations Score rescored under v4.0: 57 → 64
Jul 2026 · AssessmentRobovations Score revised 58 → 57
Jul 2026 · AssessmentRobovations Score revised 62 → 58
Apr 2026 · AssessmentRobovations Score recorded at 62 of 100
Oct 2024 · UpdateRK4000 firmware 2.5 adds dock realignment retry logic and moisture cutout confirmation
Jun 2024 · NewsStanley Black & Decker outdoor brand divestiture affects Robomow support roadmap
Mar 2024 · ReleaseEnters retail distribution at $1,999 MSRP

Editorial comparisons

How Robomow RK4000 compares.

All comparisons →

Goal-based

Which robot mower handles small yards under 5000 sq ft with tight corners

Husqvarna Automower 320 NERA + 3 more

Read comparison

Common questions

What people actually ask.

5 answered

OperationDoes the RK4000 require line-of-sight operation like remote-controlled mowers?

No. The boundary wire defines the mowing area and the mower works inside it with no operator present. Once a schedule is set, it runs on its own and returns to the base station when the battery runs low.

OwnershipHow often does the boundary wire need replacement or repair?

Robomow publishes no replacement interval for the perimeter wire. In practice the wire fails from physical damage rather than age: spade cuts during planting, rodent damage, and frost heave lifting pegs. Marking the wire route and checking it after any digging is more useful than a calendar.

OwnershipWhat is the difference between random coverage and systematic mapping mowers?

Random coverage ensures complete yard coverage but produces variable grass heights and inconsistent stripe patterns. Systematic mapping (GPS or vision-based) creates uniform coverage and stripe patterns but requires more complex setup. The RK4000 prioritizes setup simplicity over aesthetic uniformity.

OperationCan the RK4000 operate in wet conditions?

Yes, at the owner’s choice. The RK4000 has a rain sensor with adjustable sensitivity, and it can be set either to send the mower back to base when rain is detected or to keep mowing through it. Cutting saturated turf affects cut quality and can rut soft ground, so the setting is a turf decision rather than a limit of the machine.

OwnershipWhat blade maintenance is required?

The RK4000 uses offset blades on a pendulum-suspended deck. Robomow publishes no replacement interval or price for them, so condition is judged by inspection: replace when the edges are visibly rounded, chipped, or bent.

Availability

Where it's sold

We may earn commission from qualifying purchases. This does not influence classification.

Amazon See current listings

Cite / Embed

Reference the Robomow RK4000 classification.

Embed the Autonomy Ladder™ mark or copy the citation. The mark is served from this record, so a reassessment updates it on your page automatically.

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Clear space 3222 on all sides

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Citation

Robovations. "Robomow RK4000: Autonomy Level II (Assisted Autonomy)." Autonomy Ladder™, assessed September 2026. https://robovations.com/robots/robomow-rk4000/

Link it. The mark must point at this record. An unlinked mark is not authorised.
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A classification, not an endorsement. It may not appear beside language implying Robovations recommends, rates, or approves the product.

Where to next

Three ways to keep going.

For evaluators

Compare with a peer.

See the Robomow RK4000 and Ambrogio Twenty Elite side by side: autonomy level, Robovations Score, readiness, and price. Classification, not a verdict.

See the full comparison

Or compare with Ambrogio L60 Elite, McCulloch ROB R1000, Gardena Sileno Life 750.

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.

Robomow RK4000

Will the Robomow RK4000 work on your yard?

The full spec sheet.

Living with it.

How the assessment has moved.

How Robomow RK4000 compares.

Which robot mower handles small yards under 5000 sq ft with tight corners

What people actually ask.

Other robot lawn mowers we have classified.

Flymo EasiLife Go 200

Stihl iMow 6 EVO

McCulloch ROB R1000

Ambrogio Twenty Elite

Where it's sold

Reference the Robomow RK4000 classification.

Three ways to keep going.

Get the next reassessment.

Compare with a peer.

See every Level II.