Robomow RK4000 vs Robomow RK2000
Quick take: The Robomow RK2000 costs $500 less; the Robomow RK4000 is rated for a larger lawn (1 acre).
| Spec | Robomow RK4000 | Robomow RK2000 |
|---|---|---|
| Price | ~$1,999 | ~$1,499 |
| Rating | — | 2.9★ (9) |
| Navigation | Boundary Wire | Boundary Wire |
| Max Lawn Size | 1 acre (43,560 sq ft) | 0.49 acres (21,528 sq ft) |
| Max Slope | 45% (24°) | 45% (24°) |
| Cutting Width | 16.5" | 8.3" |
| Cut Height | 0.6"–3.9" | 0.6"–3.9" |
| Drive | RWD | RWD |
| Runtime | 120 min | 90 min |
| Charge Time | 110 min | 120 min |
| Noise | 65 dB | 64 dB |
| Weight | — | — |
| Obstacle Detection | Bumper on a floating deck plus lift and tilt sensors; no cameras or ultrasonics. | Bumper on a floating deck plus lift and tilt sensors; no cameras or ultrasonics, so anything left inside the wire gets bumped. |
| Edge Cutting | Yes | Yes |
| Rain Sensor | Yes | Yes |
| Cellular | No | No |
| Anti-Theft | PIN code, child lock and lift alarm | PIN code, child lock and lift alarm |
| Warranty | 3-year limited | 3-year limited |
Pros & cons
Robomow RK4000
- ✓16.5 in twin-disc cut is double the width of the smaller RKs and rare under $2,000
- ✓110-120 minutes of mowing per charge on the 9.6Ah pack
- ✓Owners report quiet running, clear setup documentation and better slope handling than similar mowers
- ✓Offset blades and near-wire following trim edges; floating deck copes with rough ground
- ✗Owners report units that stop seeing the boundary wire and support tickets left unanswered for a month
- ✗Random pattern leaves patches uncut on a full acre
- ✗App is Bluetooth-only in practice: no remote start, no job cancel, and it forgets your PIN
- ✗A full-acre wire install is a weekend job, and the wire is the most common failure point
- ✗Robomow's US presence is Home Depot only since the MTD sale; the maker's US site redirects to a parts store
Robomow RK2000
- ✓Offset blade disc and near-wire following trim edges most wire mowers leave for the string trimmer
- ✓Pendulum-suspended floating deck keeps the cut even on bumpy ground
- ✓45 percent slope rating and a very wide 0.6-3.9 in height range
- ✓3-year warranty and a big 4.3 in color touchscreen for wire-side programming
- ✗Random-pattern mowing with no camera or ultrasonic obstacle sensing
- ✗Boundary wire must be laid and buried before the first mow
- ✗Remote access requires a separately sold GSM RoboHome module
- ✗Only 80-90 minutes of runtime with up to a 2-hour recharge
- ✗Mixed retailer feedback: 2.9 out of 5 from 9 Home Depot reviews, and thin US brand presence since the MTD sale