Skip to content
Robovations
Robovations™
Robot Autonomy, Classified
Saved

ComparisonGardena Sileno Life 750 and Greenworks Optimow 15

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 Sileno Life 750 Greenworks Optimow 15
Yard size
Under ¼ acre GoodWell within 750 sq m rating; no scaling concern for small residential yards. GoodWell within the 0.37-acre coverage limit; capable, though a smaller-class mower may serve this lot equally well.
¼ – ½ acre GoodTypical suburban lawn zone falls within rated 750 sq m coverage; single-unit operation sufficient. GoodSits within the documented 1,500 m² (0.37-acre) ceiling; the Optimow 15 is rated for this size range.
Over ½ acre PoorRated coverage maxes at 750 sq m; larger estates exceed capacity and require multiple mowers or external perimeter zoning. PoorCoverage limit is 1,500 m² (0.37 acres); yards over half an acre exceed the documented operating limit.
Terrain
Mostly flat GoodOptimal operating condition; GPS positioning and wire-following both reliable on level ground. GoodFlat terrain is fully within operating envelope; no gradient concerns apply.
Gentle slopesthey differ DependsSlopes 10–15° manageable; slopes >15° introduce traction loss and wire-tracking drift per owner reports. GoodRated for up to 35% gradient; moderate slopes are comfortably within documented operating limits.
Steep / hillythey differ PoorRated for gradients under 25% per specs but owner reports document traction failure >20% on wet grass; not recommended for steep properties. DependsGreenworks specs the Optimow 15 at 35% maximum; sections near that limit warrant extra caution when grass is wet.
Grass type
Typical lawn grass GoodStandard cool-season turf (fescue, bluegrass) cuts reliably at 20–60mm heights per specification. GoodRandomized mulching-cut pattern designed for standard-height turfgrass on a regular mowing schedule.
Mixed / tall growth DependsTall fescue and other coarse grasses cut at upper range (50–60mm); may require multiple passes weekly for dense growth. DependsOvergrown grass above the blade design height may need a manual pre-cut before returning to regular automated sessions.
Thick (Bermuda / Zoysia) DependsThick Bermuda or St. Augustine grass at lower mowing height (20–30mm) increases blade dulling; weekly inspection necessary. DependsDense thick-blade turf can slow progress; frequent short-duration passes are the documented mitigation for this grass type.
Boundary setup
Wireless required PoorThis model requires 1.6mm boundary wire; no RTK or wireless boundary option available. PoorThe Optimow 15 requires physical perimeter wire; no wireless or GPS boundary option is available on this model.
Wire required GoodDesigned for perimeter-wire operation; installation straightforward with Gardena wire and connectors included. Good200 m of perimeter wire is included; the entire operating boundary is wire-defined, matching this setup.
No preference GoodUses perimeter wire. Fits readers with no boundary preference; wire is required. GoodThis model is wire-only; factor in the one-time perimeter installation before committing to this setup.

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 Sileno Life 750Specifications, evidence, the Fit Check in full, and every tracked change.The full recordGreenworks Optimow 15Specifications, 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.