RMI 422
Compact robotic mower for lawns up to 800m² | STIHL GB
General
To help keep those edges and borders in tip-top shape STIHL are offering a free FSA 45 Lithium-Ion grass trimmer with any STIHL iMOW® purchased from your local specialist iMOW® dealer.
The compact RMI 422 robot mower will mow small to medium sized lawns of up to approx. 800 m² and is designed to do this in the shortest time possible, allowing you full access to your garden when you want it. As it is fully automated, once iMOW® is installed, it will mow, charge and adapt its schedule all by itself. If the robot mower battery runs low or it starts to rain, the RMI 422 will return itself to the docking station, and depending on how much of the lawn still needs to be cut, it will decide whether to charge itself quickly or slowly helping to conserve power.
Fitted with a robust mulching blade, your grass will be finely shredded returning vital nutrients back into the soil. This also eliminates the need to dispose of any grass clippings. The iMOW® RMI 422 boasts 15 different cutting height settings, varying from 20mm-60mm so you can adjust it to suit you and your lawn! The RMI 422 comes with a 5 year extended domestic warranty (subject to registration and annual servicing). For more information please contact your local iMOW® dealer.
The STIHL iMOW® robotic mowers comply with all applicable safety standards. However, the iMOW® robotic mower is not a toy. 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.
Versions
Price-
RMI 422 Robotic mower£999.00*
* Manufacturer's recommended retail price updated as of February 2020. The manufacturer's recommended retail prices are subject to change without notice.
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Technical data

Technical data
Technical data | Value |
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Maximum lawn area m² | 800 |
Working speed rpm | 4.450 |
Cutting height mm | 20-60 |
Uncertainty factor Sound pressure level KpA dB(A) | 2 |
Weight kg | 9 |
Measured sound power level LWA dB(A) | 60 |
Max. gradient % | 35 |
Cutting width cm | 20 |
Battery type | Lithium Ion |
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Features

Standard features
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Accessories

Accessories
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AFN 075 fixing pins
Pins to fix the perimeter wire for the STIHL iMOW® robotic mower. Used to anchor the perimeter wire at the edge of the mowing area.
Each pack contains 75 fixing pins.
Versions
Price- AFN 075 fixing pins £9.50*
* Manufacturer's recommended retail price updated as of February 2020. The manufacturer's recommended retail prices are subject to change without notice.
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ARB 151 perimeter wire
COMING SOON - THIS ITEM IS NOT CURRENTLY AVAILABLE
Additional perimeter wire for defining the iMOW® mowing area. Consists of 150 m of coiled wire, 2.3 mm thickness and suitable for distances of up to 250 m.
Versions
Price- ARB 151 perimeter wire £60.00*
* Manufacturer's recommended retail price updated as of February 2020. The manufacturer's recommended retail prices are subject to change without notice.
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ARB 501 perimeter wire
Additional perimeter wire for defining the iMOW® mowing area. Consists of 500 m of coiled wire, 3.4 mm thickness and suitable for distances of up to 850 m.
Versions
Price- ARB 501 perimeter wire £175.00*
* Manufacturer's recommended retail price updated as of February 2020. The manufacturer's recommended retail prices are subject to change without notice.
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ADV 010 wire connectors
Wire connectors used to join the perimeter wire.
Each pack contains 10 connectors.
Versions
Price- ADV 010 wire connectors £11.00*
* Manufacturer's recommended retail price updated as of February 2020. The manufacturer's recommended retail prices are subject to change without notice.
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AVS 100 front wheels
Heavy front wheels to help the STIHL iMOW® robotic mower manoeuvre through extremely hilly terrain.
Versions
Price- AVS 100 front wheels £65.00*
* Manufacturer's recommended retail price updated as of February 2020. The manufacturer's recommended retail prices are subject to change without notice.
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The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Documents
Owners manuals and safety brochures
Languages | Date | Link |
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25/09/2020 |