Compare Mowers
List prices are the manufacturer’s published figures, re-checked daily; they exclude tax, freight and dealer setup.
A side-by-side reference of each model's stated specifications. MowerFacts doesn’t give opinions: where a published, spec-derived rule can separate machines we mark a Data Pick and show the rule; here, read the values and decide what fits your needs.
Best suited for
What each model is built for, from its duty class and key specs. This is a neutral reference — MowerFacts does not rank one model above another.
- Gardena smart SILENO free 1200 m² — residential: typical home lawns; 9-inch deck
- Sunseeker Sunseeker X4 — residential: typical home lawns; 8-inch deck; battery (no fuel or engine maintenance)
What’s different? The 4 differences that matter most, from the published figures.
- smart SILENO free 1200 m² is rated for slopes to 35%; Sunseeker X4 is rated for slopes to 45%, a 10 points difference. The slope rating is the maker's limit for safe operation, not a measure of performance.
- smart SILENO free 1200 m² weighs 30 lbs (13.8 kg); Sunseeker X4 weighs 27 lbs (12.2 kg), a 3 lbs difference. Operating weight bears on trailer payload, ramps and soft turf. On its own it says nothing about build quality. What smart SILENO free 1200 m²'s weight means for a trailer ›
- smart SILENO free 1200 m² has a 8.7 in (220 mm) deck; Sunseeker X4 has a 7.9 in (201 mm) deck, a 0.7 in difference. Deck width sets how much grass each pass covers. Mowing time also depends on ground speed, turns and obstacles, so a wider deck alone does not fix the job's length. Time both decks on your own lawn ›
- smart SILENO free 1200 m² is rated at 58 dB; Sunseeker X4 is rated at 60 dB, a 2 dB difference.
what isn’t comparable
Not comparable
- Battery Capacity: not published for smart SILENO free 1200 m².
- Run Time: not published for Sunseeker X4.
- Charge Time: not published for Sunseeker X4.
- Blades: not published for smart SILENO free 1200 m².
- Cut height range: not published for smart SILENO free 1200 m².
Verified means each manufacturer publishes the figure. A bigger number is only a bigger number; nothing here says which machine is better. The full specification table is below.
Which is faster on your property? › Measure your lawn once and MowerFacts times all 2 against it.
| Spec | smart SILENO free 1200 m² Gardena · Robotic |
Sunseeker X4 Sunseeker · Robotic |
|---|---|---|
| List price | dealer quote | dealer quote |
| Engine | ||
| Power Source | — | battery |
| Electrical | ||
| Battery Capacity | — | 5 Ah |
| Deck | ||
| Cutting Width | 8.7 in (220 mm) | 7.9 in (201 mm) |
| Min Cut Height | — | 1.6 in (41 mm) |
| Max Cut Height | — | 3.2 in (81 mm) |
| Blades | — | 6 |
| Drive | ||
| Drive Type | — | Rear-Wheel Drive |
| Dimensions | ||
| Weight | 30 lbs (13.8 kg) | 27 lbs (12.2 kg) |
| Width | 16.9 in (430 mm) | — |
| Length | 24.8 in (630 mm) | — |
| Height | 10.2 in (260 mm) | — |
| Robotic | ||
| Work Area | 1200 ft2 | 1214 ft2 |
| Max Slope | 35 pct | 45 pct |
| Navigation | — | 360° 3D LiDAR + Vision AI (L - SLAM) |
| Boundary | Virtual wire | — |
| Run Time | 140 min | — |
| Charge Time | 100 min | — |
| Noise Level | 58 db | 60 db |
| Rain Sensor | — | Yes |
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.