Honda Miimo HRM520IIAssistedCompare

Released 2017.06Reassessed 2026.08.07Compare

Honda Miimo HRM520

Name: Honda Miimo HRM520
Brand: Honda

Honda's Miimo line pursued dealer-centric distribution for premium wire-guided mowers. The HRM520 was technically sound but could not overcome margin pressure from direct-to-consumer wire-guided competitors and GPS alternatives. Winding down reflects market rejection, not capability failure.

List price

$3,500

Retail price not tracked

Released 2017.06Reassessed 2026.08.07

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

Honda Miimo HRM520 runs preset routines on its own, and the owner is its recovery system.

Navigation and control

Wire-guided with random-pattern generation
Why this level
- Wire-guided operation within buried perimeter boundaries meets Level II criteria for assisted autonomy.
- The mower executes autonomous mowing patterns within the wired zone but cannot adapt to boundary changes or navigate unmapped obstacles outside the wire path.
Autonomy dimension 40 / 100 · No independent sources reviewed, 1 from the maker
IManual AutomationOne action on command; no independent operation.

How we assign a level →

Behind the classification

Sources on file.

PendingNo independent sources reviewed, 1 from the maker

Fewer than two independent sources reviewed. Evidence is still being collected. The word says how much we read. It is not a grade.

From the maker, reviewed1

Specification sources1 source

Pages the published specifications were read from.

powerequipment.honda.compowerequipment.honda.com

Our own recordNot counted

Longitudinal signal2 sources

Robovations dated log for this robot: 3 tracked entries spanning ~16 months.

Also monitored, nothing listed yet

Manufacturer documentation

Honda Miimo HRM520 spec sheet, user manual, and dealer setup documentation covering blade geometry, wire installation, and end-of-life discontinuation notice.

Owner reports

Honda Miimo owner forums documenting parts sourcing challenges, seasonal maintenance, and dealer support discontinuation impact.

How we evaluate evidence →

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

Honda Miimo HRM520 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 June 2017; since discontinued
No current new-stock listing confirmed
No independent sources reviewed, 1 from the maker

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

53of 100

LimitedAt or above 11% of the 456 robots we scoreand 3% of the 112 scored robot lawn mowers

DeficientLimitedCapableStrongExemplary

What moved itpoints gained or lost against a typical robot

Carried by

Consumables83+1.1
Operating envelope90+0.9

Held back by

Software stability33−4.5
Coverage and navigation40−3.2
Support longevity35−2.7

Capability40% of the score55What it does without you.

Task completion16% of the score72

Evidence

Mows, docks, recharges and goes back out on schedule with no operator step, working a 32,300 sq ft rating at 1,300 sq ft an hour on a 70 minute run against a 60 minute charge, the better duty cycle of the two Miimos. The deductions are the platform's: the wire is inset with no dedicated edge pass so the perimeter strip stays with the owner, and with no positioning of any kind the owner confirms coverage by eye because the machine keeps no record of where it has been.

Coverage and navigation10% of the score40

Evidence

Wire-guided with random-pattern generation and no GPS, camera or map, which is the same navigation stack as the HRM310 and scored the same. The mower holds no memory of ground already cut, so completion depends entirely on accumulated run time inside the loop. The bounded area is the only thing keeping this off the bottom anchor.

Edge-case recovery10% of the score30

Evidence

No connectivity at all, so a fault in the yard reaches nobody and the machine is found stalled rather than reported. The record states outright that diagnosing a wire break needs a boundary tracer tool, which exists precisely because the machine cannot locate the break itself, and that wire routing is difficult to diagnose secondhand. The sibling HRM310, materially the same deck and control system, has a documented absence of automatic self-righting and recovery, and that record governs here.

Operating envelope4% of the score90

Evidence

A strong envelope for a wire-guided machine, and it is a published figure rather than an inference: 24 degrees, a 45 percent gradient, above the Husqvarna 315X's 40 percent, on a 32,300 sq ft rating with 300 m of wire supplied. Wire guidance makes canopy and light irrelevant. Against it, the record states traction is lost and cut quality falls off above the rating, and no rain or weather deferral behavior is documented anywhere in the record.

Dependability40% of the score46Whether it keeps doing it.

Field failure rate16% of the score64

Evidence

Nine years since the 2017 launch and five on sale before the 2022 North American discontinuation, with no recall, no systemic defect and the record's own judgment that the wind-down reflects market rejection rather than capability failure. This stays mid-scale because it is a structural read: the owner-report source is unlinked and ongoing, the manufacturer-doc source is a bare Honda landing page, and no independent field dataset exists. Absence of a failure record is absence of evidence.

Software stability14% of the score33

Evidence

There is no update channel of any kind: the specification lists no connectivity, no app, no Wi-Fi and no Bluetooth, and scheduling is on the machine. Rule 1 applies without qualification, a machine with nothing to update earns nothing for having no updates to break, and this takes the no-channel anchor rather than the ordinary silent-record 50, which is for machines that do ship updates.

Support longevity10% of the score35

Evidence

Discontinued in North America in 2022 with no authorized dealer support and no warranty on a new purchase, which is most of the way to the anchor's low state. What separates it from the HRM310's 15 is a verified parts channel that still exists: the record states Honda's catalogue currently lists Miimo consumables and installation parts including 200 m and 300 m boundary wire reels, so genuine blades and wire remain orderable. The record is equally clear that how long that listing holds is the open question.

Ownership burden20% of the score61What it asks of you.

Routine maintenance12% of the score46

Evidence

Six recurring items, three of them on the wire, with a weekly perimeter inspection after heavy rain being a heavy cadence, plus an annual continuity trace. Around that: deck clearing after every use, monthly dock contact testing and wheel checks, and seasonal winterizing with indoor storage. What lifts it above the HRM310's 38 is the blade interval, which Honda states as roughly 160 cutting hours with a visible wear cue rather than the 310's two to four weeks.

Consumables8% of the score83

Evidence

Three blades per set at roughly 160 cutting hours is close to a season's interval, and the supply is currently assured rather than aftermarket-dependent: the record confirms genuine Honda sets and wire reels are still catalogue items, which is exactly what the HRM310 record could not say. No subscription, no filters, no connectivity fee. Held below the top because the record forbids sharpening or substituting blades on fragmentation grounds, so there is no cheap third-party fallback if the catalogue listing lapses.

middle half of the databaseits medianthis robot

Reported, not scoredneither measures how well the robot works

Five-year cost$4,100

Top of the range for robot mowers and poor value, driven entirely by the purchase price. 3,500 dollars at the original MSRP, plus roughly 250 dollars of genuine Honda blade sets over five years at the 160 hour interval, about 100 dollars of wire and pegs beyond the 300 m supplied, and one replacement battery pack. No subscription and no connectivity fee, because there is no connectivity. The figure is a new-unit MSRP on a line discontinued in 2022, so a real buyer transacts on the secondary market at an unpredictable price against no warranty.

Data postureLocal

Core function needs no account and no network.

What leaves the homeNot documented

Read the full methodology →

FIT CHECK

Will the Honda Miimo HRM520 work on your yard?

Describe your yard using the controls. Each choice reads the spec sheet for you, flagging where the Honda Miimo HRM520 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.

OWNERSHIP

Living with it.

Solid engineering in active years; discontinuation leaves long-term maintenance sourcing uncertain.

Mixedowner-reported arc

The record so far

Honda's manufacturing history and field documentation show reliable blade automation and stable wire-guided operation. Post-discontinuation (2022), parts sourcing shifts to aftermarket channels; long-term failure recovery depends on secondary-market parts availability rather than manufacturer support.

What goes wrongnot yet documented independently

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

Upkeep routine

Each useEvery cycle

Clear grass clippings and debris from housing and deck underside.

Weekly52×/yr

Inspect perimeter wire for damage, breaks, or corrosion, particularly after heavy rain.

Monthly12×/yr

Test dock charging contacts and clean with a dry cloth if charging is intermittent. Check wheels and underside for packed clippings.

Seasonal4×/yr

Winterize the dock and store the machine indoors. Store the lithium pack charged rather than run down.

Yearly1×/yr

Inspect wire continuity with boundary tracer; repair breaks discovered. Verify dock connector condition.

When duewhen worn or full

Replace all three cutting with a genuine Honda set. Honda gives blade life as about 160 hours and says worn blades show as white fibre in the cut, so the trigger is hours run rather than the calendar. Blades are replaced, never sharpened.Typical for robot mowers: seasonally

Cost over timeabout $360 past the sticker over three years

PurchaseRunning cost

Year 1

$3,620

Year 3

$3,860

Year 5

$4,100

$3,500 to buy, then about $120 a year for the replaceable parts below. Over three years that is roughly $360 past the sticker price. Excludes electricity and any repairs.

What you replace

Every 160 cutting hours

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

Safety notes2 cautions

CautionBlade hazard during perimeter-wire maintenanceBlade guard access required for seasonal wire inspection; blade can rotate if dock is powered.
CautionElectrical hazard in damp conditionsDock uses 110V weatherproof connections; water ingress from years of outdoor exposure poses risk.

SPECIFICATION

The full spec sheet.

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

Dimensional drawing

Key specificationsManufacturer-publishedSources: Product page

FootprintThe width, depth and height of the robot itself, without its dock.: 28 × 24 in, 9 in tall
WeightThe robot alone, without its dock, as the maker states it.: 26.2 lbs
BatteryStored energy in watt-hours; a larger pack runs longer, not harder.: 80 Wh · Li-ion
Cutting width: 8.7 in
Cutting height range: 0.8-2.4 in
Max area: 32,700 sq ft
Max slope: 47%
Boundary method: Buried boundary wire•
Drive layout: Rear-wheel drive, two driven rear wheels
Blade system: Three-blade pivoting disc•

Where it lands · position among 134 robot lawn mowersThis robotMedianTypical range

RuntimeThe maker's stated running time on one charge, at a standard setting.70min

30 min240 min

Near median

PriceThe maker's list price, not a price found in a shop.$3,500

$549$5,999

Above median

NoiseLoudness at the maker's stated distance, in decibels; ten more decibels reads as about twice as loud.70dB

50 dB75 dB

Above median

Charge timeTime from empty to full on the dock, as the maker states it.60min

30 min300 min

Near median

WeightThe robot alone, without its dock, as the maker states it.26.2lbs

13 lbs88.2 lbs

Near median

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

Official referencesProduct page

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 rescored under v4.2: 55 → 53
Jul 2026 · AssessmentRobovations Score recorded at 55 of 100
Aug 2025 · NewsHRM520 resale market reflects post-discontinuation uncertainty on pricing
Apr 2024 · NewsHonda confirms US Miimo line discontinued; dealer support ends

Questions

What people actually ask.

4 answered

OperationWhy did Honda discontinue the Miimo HRM520 despite technical capability?

Market demand and margin pressure from direct-to-consumer wire-guided competitors (Robomow, Husqvarna Automower) and GPS-based alternatives proved unsustainable. Dealer-centric distribution model could not scale profitably against online-first competitors.

OperationCan I still get parts and blades for an HRM520 I already own?

Honda’s parts catalogue still lists Miimo consumables and installation parts, including 200 m and 300 m boundary wire reels, so genuine blades and wire remain orderable. Replace the three cutting blades as a genuine Honda set. They are small steel blades pivoting on a disc at speed on a machine that runs unattended with nobody watching it, so a sharpened, improvised or fabricated blade is a fragmentation hazard to anyone in the yard, not a cost saving.

OperationWhat is the difference between the HRM520 and HRM310?

Not the deck. Both cut 8.7 in with a three-blade disc. The HRM520 is rated for 3,000 m2 of lawn and ships with 300 m of boundary wire; the HRM310 is rated for 2,000 m2 and ships with 200 m. Both are bounded by a perimeter wire, which can be pegged at the surface or buried.

OperationIf I buy a used HRM520, what should I check first?

Verify perimeter wire integrity with a boundary-wire tracer tool. Test dock charging and battery hold. Request the original dealer installation documentation if available, as wire routing is difficult to diagnose secondhand.

Cite & Embed

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Robovations. "Honda Miimo HRM520: Autonomy Level II (Assisted Autonomy)." Autonomy Ladder™, assessed August 2026. https://robovations.com/robots/honda-miimo-hrm520/

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Where to next

Three ways to keep going.

For evaluators

Compare with a peer.

See the Honda Miimo HRM520 and Stihl iMow 6 EVO side by side: autonomy level, Robovations Score, readiness, and price. Classification, not a verdict.

See the full comparison

Or compare with Yard Force Compact 400Ri, Greenworks Optimow 15, Robomow RT300.

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 every Level II robot

Updated weekly with new entries and reclassifications.

Honda Miimo HRM520

Will the Honda Miimo HRM520 work on your yard?

Living with it.

The full spec sheet.

How the assessment has moved.

What people actually ask.

Other robot lawn mowers we have classified.

Stihl iMow 6 EVO

Worx Landroid S 20V

Husqvarna Automower 115H

Husqvarna Automower 305

Reference the Honda Miimo HRM520 classification.

Three ways to keep going.

Get the next reassessment.

Compare with a peer.

See every Level II.