Our verdict
Stihl's mid-range robotic — solid hardware with the Stihl dealer support advantage. The RMI 422.2 PC handles up to 800m² well and the app scheduling is straightforward. For the same money the Husqvarna 410 XE NERA gives you satellite navigation upgrade options.
Pros & cons
Pros
- Stihl iMOW app for scheduling
- Quieter than petrol equivalent (60 dB)
- GPS theft tracking included
- Stihl dealer network for service
Cons
- Boundary wire required (no satellite navigation option)
- Cutting width is small at 20cm
- Premium price for capability matched by Husqvarna 305 at lower cost
- Stihl battery family less widely shared than Husqvarna
Full specs
| Type | Robotic |
|---|---|
| Cut width | 20 cm |
| Engine / Power | Stihl brushless |
| Weight | 8.7 kg |
| Deck | Composite |
| Self-propelled | Yes |
| Rear roller | No |
| Mulching | Yes |
| Cutting heights | 6 positions |
| Bag capacity | — |
| Suited to lawn | Medium |
| Noise level | 58 dB |
Buying second-hand
£480-680 used. Check the cutting disc for chipped blades (£12 for a replacement pack). Always look at the wheel motors — high-time examples have play in the front swivel. Boundary wire installation is the biggest pain — pay £150-200 for a Stihl dealer to do it properly.
Where to buy the Stihl RMI 422.2 PC
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Repair-cost reference
UK 2026 ballpark prices for the parts you're most likely to need on this mower. OEM is dealer-genuine; aftermarket is what you'll find on eBay or generic small-engine suppliers. Use these to sense-check any quote and to negotiate on used buys.
| Part / job | OEM | Aftermarket |
|---|---|---|
|
Replacement 20cm blade
Annual sharpening is free; replace when bent or cracked.
|
£24–£32 | £8–£12 |
|
Replacement battery
Wear part — typical 3–5 years to 80% capacity. The biggest single repair cost on any battery mower.
|
£90–£180 | £55–£120 |
|
Mainboard / control unit
Failure typically requires dealer fit. Not economic past 8 years on entry-tier robots.
|
£180–£320 | — |
|
Boundary wire repair (per splice)
Most common robotic fault — see /blog/robotic-mower-boundary-wire-repair.
|
£12 connector | £4 |
Fair-offer calculator
Tell us about a specific used listing for the Stihl RMI 422.2 PC you're looking at. We'll compute a fair offer range from our used-market data and the condition signals you provide.
Calculations are guidance, not gospel. Used-market prices vary by region (Scotland is typically 10–15% cheaper than the South-East), season (October cheapest, March most expensive), and seller motivation.
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