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Robot Autonomy, Classified
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ComparisonGardena smart Sileno free 800 and Goalker H3 Pro

Up to three

All robot lawn mowers. 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.

Fit verdicts by condition for each robot
Condition smart Sileno free 800 Goalker H3 Pro
Yard size
Under ¼ acre GoodCoverage rated for up to 800 m² (8,600 sqft); quarter-acre yards fall well within range. GoodRated to 1,500 m² (about 0.37 acres); comfortably covers yards under a quarter acre.
¼ – ½ acrethey differ DependsUpper end of rated coverage; multiple dock zones or split scheduling may be required for consistent weekly cuts. GoodRecommended area is 1,200 m² (about 0.3 acres) with a stated 1,500 m² max, matching this range.
Over ½ acre PoorExceeds 800 m² rating. Manufacturer documentation does not address larger properties; runtime and battery capacity unspecified for boundary sprawl. PoorGoalker caps documented coverage at 1,500 m² (about 0.37 acres); not rated for yards over half an acre.
Terrain
Mostly flat GoodIdeal operating condition. Flat turf with firm ground optimizes GPS accuracy and traction. GoodRated to a 35% (about 19°) gradient, well beyond flat ground.
Gentle slopesthey differ DependsRated for up to 25% gradient; 15-20% slopes perform reliably. Steeper sections may cause traction loss or GPS signal fade. GoodThe 35% (about 19°) gradient rating comfortably covers moderate slopes.
Steep / hillythey differ PoorAbove 25% gradient, traction failure and boundary-detection unreliability documented. Sidehilling on slopes above 20% produces GPS accuracy loss. DependsRated to a 35% (about 19°) gradient, but no independent test confirms traction on wet or uneven steep terrain.
Grass type
Typical lawn grass GoodDesigned for standard residential turfgrass. Mulching blade and systematic navigation optimized for fine-to-medium blade grass types. GoodCutting height adjusts 25-60mm, suited to standard turfgrass.
Mixed / tall growth DependsBlade dulling accelerates in tall or coarse grass; more frequent replacement intervals expected. Manufacturer cadence based on standard mowing height assumption. DependsNo documented pass count or cutting headroom beyond the stated 25-60mm range for overgrown grass.
Thick (Bermuda / Zoysia) DependsDense, thick grass increases blade stress and motor load; slower coverage and potential battery drain on single-pass schedules. Test in heavy-growth season before committing. DependsNo independent test of dense grass varieties was found; blade torque for heavy growth is undocumented.
Boundary setup
Wireless required GoodWire-free GPS geofencing is this mower's defining feature. No perimeter wire required; virtual boundary drawn via app. GoodWire-free by design; navigates via RTK and VSLAM with no boundary wire needed.
Wire requiredthey differ DependsThis mower does not support perimeter wire operation. If you prefer wire-based boundaries, older Sileno+ models (wired) offer that option with proven RTK availability on select tiers. PoorWire-free architecture only; no boundary-wire support is documented.
No preference GoodWireless GPS geofencing is the only boundary method available; no wire option. Works well for owners with no preference. GoodOperates wire-free with no boundary wire required, suiting readers with no wire preference.

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.

Keep going.

The full recordGardena smart Sileno free 800Specifications, evidence, the Fit Check in full, and every tracked change.The full recordGoalker H3 ProSpecifications, 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.