Stihl Robot Lawn Mower Review
Stihl brings its reputation for rugged outdoor power equipment to the robotic mower market with the iMow series. This review covers the lineup, key specifications, and what owners and aggregated reviews say about performance, reliability, and value.
Quick answer
The Stihl iMow 632.2 P is the top pick for owners with medium to large lawns who want a robust, GPS-guided mower with excellent build quality and reliable boundary detection. For smaller lawns, the iMow 422.2 P offers similar features at a lower price point, though both require professional installation for best results.
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Research updated June 2026.
Stihl iMow 632.2 P
GPS-assisted navigation, robust build, and handles slopes up to 45%.
| Model | Best For | Max Area | Slope Rating | GPS | Rating |
|---|---|---|---|---|---|
| iMow 632.2 P | Large lawns, hills | 0.75 acres | 45% | Yes | 4.5/5 |
| iMow 422.2 P | Medium lawns | 0.5 acres | 35% | Yes | 4.3/5 |
| iMow 322.2 P | Small lawns | 0.25 acres | 25% | No | 4.1/5 |
| iMow 222.2 P | Entry-level | 0.15 acres | 20% | No | 3.9/5 |
Stihl iMow 632.2 P
Best OverallPros
- GPS navigation reduces random mowing patterns
- Handles steep slopes reliably
- Stihl build quality and warranty support
Cons
- Professional installation recommended
- Higher price than comparable models
The 632.2 P is the flagship model in Stihl's robotic lineup. Aggregated owner reviews from retailers and forums consistently praise its ability to navigate complex lawns with multiple zones and steep gradients. The GPS module allows the mower to map the lawn and mow in systematic strips rather than random patterns, which leads to more even coverage and faster completion times.
Battery life is sufficient for most medium to large lawns, and the mower returns to its docking station automatically when charge runs low. Some owners note that the initial setup and boundary wire installation can be time-consuming, and Stihl recommends professional installation for optimal performance. The cutting deck is robust, and replacement blades are readily available through Stihl dealers.
Stihl iMow 422.2 P
Best ValuePros
- GPS navigation included
- Good balance of features and price
- Quiet operation
Cons
- Not ideal for very steep lawns
- Smaller battery than 632.2 P
The 422.2 P offers many of the same features as the flagship model but in a package suited for medium-sized lawns. Owner reviews highlight its quiet operation and consistent mowing patterns thanks to the GPS module. The mower handles moderate slopes well, though users with hills over 35% may need to look at the 632.2 P.
Battery life is adequate for up to 0.5 acres, and the mower recharges automatically. Some owners report that the boundary wire can be tricky to lay on uneven ground, but once installed, the mower runs reliably. The cutting height is adjustable, and the blades are easy to replace.
Stihl iMow 322.2 P
Best for Small LawnsPros
- Compact size for smaller yards
- Easy to install and program
- Stihl reliability at a lower price
Cons
- No GPS guidance
- Limited to gentle slopes
The 322.2 P is designed for smaller, simpler lawns. It lacks the GPS module found on the higher models, meaning it mows in a random pattern. For small, open lawns, this is less of an issue, and owner reviews indicate the mower still covers the area effectively over multiple sessions.
Setup is straightforward, and the mower is lighter than its larger siblings, making it easier to move around if needed. The 25% slope rating means it is best suited for flat or gently undulating lawns. Owners appreciate the quiet operation and the ability to schedule mowing times via the control panel.
Stihl iMow 222.2 P
Budget PickPros
- Lowest price in the iMow range
- Simple controls
- Stihl build quality
Cons
- Very limited area capacity
- No GPS, random mowing pattern
The 222.2 P is the most affordable entry point into the Stihl robotic mower ecosystem. It is designed for very small lawns or courtyards up to 0.15 acres. Owner reviews note that it is easy to set up and program, with a simple interface that does not require a smartphone app.
Performance is adequate for its intended use, but the random mowing pattern means it may take longer to cover the area evenly. The 20% slope limit restricts it to flat lawns. Some owners wish for a larger battery, but for small spaces, it usually completes the job on a single charge.
Who is the Stihl iMow series for?
The Stihl iMow range is designed for homeowners who want a reliable, low-maintenance robotic mower from a brand known for durability. The models with GPS (422.2 P and 632.2 P) are best for those with medium to large lawns who want efficient, systematic mowing. The entry-level models suit smaller, simpler lawns where random mowing is acceptable.
Performance and build quality
Aggregated owner reviews from retailers and forums consistently praise the build quality of Stihl iMow mowers. The plastic bodies are robust, and the cutting decks handle wet grass better than some competitors. The GPS models show a noticeable improvement in mowing efficiency, covering the lawn in neat strips rather than bouncing around randomly.
Battery life is as advertised for each model, and the automatic charging function works reliably. The mowers handle slopes well within their rated limits, though owners with steep lawns should opt for the 632.2 P. The cutting quality is good, with a clean finish on most grass types. Replacement blades are affordable and easy to source.
Alternatives to consider
If the Stihl iMow range does not fit your needs, consider the Flymo EasiMow 500 for a lower-cost option with similar features. For larger lawns, the Husqvarna Automower range offers a wider selection of models with advanced features like cellular connectivity. The Bosch Indego S+ is another strong competitor with GPS mapping at a competitive price point.
What to check before buying a robotic mower
Measure your lawn area accurately and compare it to the mower's maximum capacity. Check the slope rating of your lawn against the mower's specifications. Consider whether you need GPS guidance for efficient mowing or if a random pattern is acceptable. Factor in the cost of professional installation for the boundary wire, especially for larger or complex lawns.
Mistakes to avoid
Do not underestimate the time required for boundary wire installation. Do not choose a model with too low a slope rating for your terrain. Do not skip the GPS option if you have a lawn with multiple zones or obstacles. Do not forget to check the availability of replacement blades and parts from local dealers.
FAQs
Do Stihl robot mowers need a boundary wire?
Yes, all Stihl iMow models require a boundary wire to define the mowing area. The wire is included with the mower.
Can Stihl robot mowers handle rain?
Yes, the mowers are weather-resistant and can operate in light rain. Heavy rain may cause the mower to return to the dock.
How long does the battery last on a Stihl iMow?
Battery life varies by model, typically ranging from 60 to 90 minutes of mowing time before returning to charge.
Do I need a smartphone app to use a Stihl robot mower?
No, the mowers can be programmed directly via the control panel. Some models also offer optional app connectivity.
What is the warranty on Stihl iMow mowers?
Stihl offers a 2-year warranty on robotic mowers, with options for extended coverage through dealers.
Can the Stihl iMow mow in the dark?
Yes, the mowers can operate at any time of day or night, as they do not rely on light sensors for navigation.
How often should I replace the blades?
Blades should be replaced every 2-3 months depending on usage and grass type. Dull blades reduce cutting quality.
Is professional installation required?
Stihl recommends professional installation for best results, especially for larger lawns or complex layouts.
Can the mower handle leaves and twigs?
The mower is designed for grass only. Leaves and small twigs may be mulched, but larger debris should be cleared first.
What happens if the mower gets stuck?
The mower has sensors that detect if it is stuck and will attempt to free itself. If unsuccessful, it stops and waits for assistance.
Our verdict
The Stihl iMow 632.2 P is the best overall choice for those with medium to large lawns and steep slopes, offering GPS-guided efficiency and robust build quality. For smaller lawns on a budget, the iMow 422.2 P provides excellent value with GPS navigation at a lower price point.