Our 4 Series iMOW® robotic mowers are compact, easy to use and help you get a lush lawn with no effort.
You can programme the iMOW® to mow when you want it to and they are designed to mow your lawn in the shortest time possible so you can still use your garden whenever you want to. You don't even need to empty the grass box either - iMOW® is a mulching mower, which means that it shreds the grass clippings finely and drops them back onto the lawn to act as a nutrient-rich fertiliser.
The RMI 422 covers areas up to 800m² and gradients up to 35% and is the perfect model for small to medium-sized lawns. If your lawn is larger, take a look at the RMI 422 P, which can cover areas up to 1,500m² and gradients up to 40%. For the ultimate flexible mowing option, the RMI 422 PC is for you. This model can cover areas up to 1,700m² and gradients up to 40%, plus it also as app connectivity. Simply use the iMOW® app to set up or adjust the mower's settings in seconds. Using the app, you can change the mowing plan, read status messages and pause or start new mowing operations wherever you are.
The perimeter wire and pegs are available in a separate installation kit and are not included with the iMOW® as standard.
iMOW® robotic mowers are not toys. During the iMOW® robotic mower's active times, children, bystanders and animals must be kept out of the working area. Please refer to the operating instructions for further information.
FeaturesDynamic mowing plan
When you set up the mowing plan of your iMOW® robotic mower, you can set the active timeframe during which the iMOW® can operate. Within these windows of active time, the automatic lawn mower will work out the best times to mow for an optimum result. If it has to stop mowing because of rain, it automatically catches up later within the specified time window. You can set the mowing plan via the control panel, or via the iMOW® app for C models.
App control (RMI 422 PC only)
With the RMI 422 PC, the iMOW® app can be used to easily update or change any settings while on the move. This is really useful if you want to send the iMOW® out to mow earlier than scheduled, or delay it till later. It also works in conjunction with online weather forecasts to make sure that the iMOW® only mows in suitable weather conditions.
The iMOW® has a movable hood with sensors which helps to protect the robotic mower from weather and obstacles. If the iMOW® robotic mower comes up against an obstacle during automatic mowing, the integrated sensors detect contact with the object and changes direction.
The smooth-running wheels have a traction pattern that helps the STIHL iMOW® robotic mower move with precision, even on hilly areas. The wheels of the automatic lawn mower are also self-cleaning.
Adaptive slope speed
The adaptive slope speed technology means that the STIHL iMOW® robotic mower can adapt its speed on uneven terrain. The mower has an integrated tilt sensor which continuously analyses the position and adjusts its speed as necessary.
Easy-to-use control panel
The control panel of the STIHL iMOW® robotic mower features a large LCD display, which is easy to read even in bright sunlight and is intuitive to use.
FAQsQWhat happens if there is an obstacle on the lawn?
A: If the iMOW® robotic mower comes up against an obstacle during automatic mowing, the integrated sensors detect contact with the object and the mower simply changes direction. However, the mower does have a sharp mowing blade and children, pets and bystanders should not be in the working area at the same time as the iMOW®.
QWhat is included with the iMOW®?
A: The iMOW® robotic mower comes with the docking station, four pegs for securing the docking station to the ground and an iMOW® ruler which is used during installaton when laying the perimeter wire. The perimeter wire and pegs are available in a separate installation kit that is not included with the iMOW®.
QCan someone steal the iMOW®?
A: It is possible to pick up the robotic mower, but all iMOW® robotic mowers can have a 4 digit pin code activated that prevents other people from being able to use the machine. If the iMOW® is picked up, an alarm sounds and automatic mowing is turned off unless the pin is entered within one minute. Additionally, all C models can be located via the iMOW® app using the built in GPS receiver.
QCan the iMOW® stay outside all year round?
A: Over winter, we recommend storing the iMOW® itself in a secure, dry place. Before you do this, you should fully charge the iMOW® battery, switch off the automatic mowing system and set the iMOW® to its highest security level. The docking station can remain in the garden over winter and does not need to be removed, but the power cable should be disconnected from the mains and the docking station during the period when it is not in use. In extreme weather you can cover the docking station if you wish to, with a secure storage box or similar.
QDo I have to empty the grass box?
A: No, the iMOW® is a mulching mower so it shreds the grass clippins finely and drops them back into the grass as a nutrient-rich, natural fertiliser. So over time, the robotic mower will also improve your lawn too.
QDoes the iMOW® work in the rain?
A: The iMOW® robotic mower has in-built rain sensors but you can set the rain sensitivity level on your mower yourself. Depending on the level of sensitivity chosen, the iMOW® will only mow if conditions are almost or completely dry. We do recommend setting it so that the mower operates in mostly dry conditions as this stops the iMOW® from getting dirty and protects the roots of your lawn. If you have set it like this and the rain sensor is activated on the iMOW®, it will stop mowing when it starts to rain and return to its docking station. When the rain stops, it automatically will resume mowing the lawn. If it rains through the entire active time, the dynamic mowing plan allows iMOW® to make up for lost time on a different day. For example, if it rains on a Monday then it may make up the time on the Tuesday instead.
QHow short will iMOW® cut the grass?
A: The iMOW® has multiple different heights settings from 20mm to 60mm, which can be easily adjusted on the mower.
QHow does the iMOW® work?
A: The iMOW® operates within a perimeter wire that you set up when you install the mower. The signal generated by the wire tells the iMOW® where to mow so it's important to make sure the wire is installed correctly. If you have a particularly complicated garden layout, you may want to get one of our STIHL Approved Dealers to install the iMOW® for you instead. You can find your nearest iMOW® specialist STIHL dealer here.
QCan I install the iMOW® myself?
A: You can install an iMOW® yourself. There are instructions on how to do this in the User Manual. We also have a video guide showing you to how to install your iMOW®. However if you would prefer not to install it yourself, we recommend ordering your iMOW® from one of our STIHL Approved Dealers as they can also carry out the installation for you. You can find your nearest iMOW® specialist STIHL dealer here.
Tips#1Cleaning your iMOW®
To clean your iMOW® you should disable it first, then clean it with a brush or damp cloth. You can find full instructions for how to to do this in our video
#2Storing your iMOW®
If you do not plan to use your iMOW® for an extended period of time, such as over winter, you should fully charge the iMOW® battery, switch off the automatic mowing system and set the iMOW® to its highest security level. Depending on your iMOW® model, you can also set it to hibernation mode. The mower should then be stored in a secure, dry place, such as a garage. The docking station can remain in the garden over winter and does not need to be removed, but the power cable should be disconnected from the mains and the docking station during the period when it is not in use.
#3Cutting height on your iMOW®
When the weather is hot and dry, we recommend that you select the highest cutting height on the iMOW® so that the ground doesn’t dry out so fast and the lawn doesn’t burn from the heat.
|RMI 422||RMI 422 P||RMI 422 PC|
|Maximum lawn area m²||800||1,500||1,700|
|Working speed rpm||4,450||4,450||4,450|
|Cutting height mm||20-60||20-60||20-60|
|Average mowing duration per week h||16||25||28
|Uncertainty factor Sound pressure level KpA dB(A)||2||2||2|
|Measured sound power level LWA dB(A)||60||60||60|
|Max. gradient %||35||40||40|
|Cutting width cm||20||20||20|
Andreas Stihl founds an engineering office in Stuttgart and develops his own chainsaw.
STIHL becomes a brand. The name represents the ceaseless quest of the engineer and company founder Andreas Stihl to ease the heavy labour of forestry work with his inventions.
STIHL presents his portable petrol-powered chainsaw at the Leipzig trade fair – it is well received and orders flow in from across Europe.