Kärcher RCW 4 window-cleaning robot
Automatic window-cleaning robot for large windows in Tallinn. Suitable for panel-block and high-rise glass when the robot can be installed safely.

Kärcher RCW 4 window-cleaning robot
The Kärcher RCW 4 automatically cleans windows, mirrors and other smooth glass. Vacuum hold, systematic navigation and four corner sensors help it clean frameless glass too. The microfibre cloth is continuously moistened with cleaning solution.
Rental set: Kärcher RCW 4, three microfibre cloths, remote control, filling bottle, and safety rope. Detergent is not included; a 20 ml Kärcher RM 503 portion is available as an optional extra.
The robot is designed for large and hard-to-reach glass. For exterior glass at height, secure the safety rope to a suitable indoor anchor before installing the robot, following the manufacturer’s instructions. Never lean or climb out of a window; use a professional service if safe installation or securing the work area cannot be ensured.
Large windows and glass in panel blocks or high-rise buildings, only when the robot and safety rope can be installed safely.
What is included & detergent
- Kärcher RCW 4 window-cleaning robot
- 3 microfibre cloths
- Remote control
- Filling bottle
- 4 m safety rope
Detergent is not included. A 20 ml portion of Kärcher RM 503 is available as an optional extra.
Kärcher RM 503 20 ml konsentraat = 250ml pesuainet · 3 € / portion
Technical specifications
- Suction power
- 3000 Pa / max 5000 Pa
- Cleaning speed
- 2,5 min/m²
- Cleaning solution tank
- 150 ml
- Area per tank
- up to 100 m²
- Power cable
- 5 m
- Safety rope
- 4 m
- Minimum window size
- 40 × 40 cm
- Weight
- 1,5 kg
- Dimensions
- 264 × 256 × 72 mm
- Power supply
- 100–240 V / 50–60 Hz
- Sound pressure level
- 62 dB(A)
- Sound power level
- 77 dB(A)
- Emergency hold on glass
- 40 min
- Product replacement value
- 294,00 €
How to use
- Use the device only for household cleaning permitted by the manufacturer and on suitable glass. The minimum window size is 40 × 40 cm. Pre-clean heavily soiled windows; never place the robot on wet glass.
- For exterior glass at height, attach the supplied 4 m safety rope to a suitable stable point as directed by the manual before installing the robot. Keep the rope clear of its travel path. Never lean or climb out of a window.
- Before starting, keep the area below clear of people and pets, and keep the device within sight and hearing while it operates. Stop outdoor use in strong wind or precipitation, or if a fault or warning occurs.
- Do not use the robot on damaged glass, frames or anchor points, or where safe installation and tethering cannot be ensured. Use a professional cleaning service in that case.
- Use only original Kärcher window detergent. Mix a 20 ml RM 503 portion with 230 ml water (250 ml total); always follow the issued package and manufacturer instructions.
- Return the robot, three microfibre cloths, remote, filling bottle, safety rope at the agreed time. Detergent is not included in the rental set.
Frequently asked questions
Is it suitable for large windows and high-rise apartments?
Yes, when the glass meets the manufacturer requirements and the robot and safety rope can be installed safely. Minimum window size: 40 × 40 cm. Never lean or climb out of a window.
Is detergent included?
Detergent is not included. You may add a 20 ml Kärcher RM 503 portion at the price shown with the extra. Mix 20 ml detergent with 230 ml water and follow the package and manufacturer instructions.
Does the robot remove heavy dirt?
The RCW 4 is intended for regular maintenance cleaning. Heavily soiled windows need pre-cleaning.
Select dates and see the price before confirming.
The green range is your selected rental period. Grey dates are booked or in the past.