Comparison ABIR WD9 vs ABIR WD8

Suction power determines how securely the window-cleaning robot adheres to the glass. A higher value helps maintain adhesion when moving over joints, minor unevenness, or areas where the cleaning pad does not fit tightly. However, stronger suction does not guarantee better removal of stains and streaks—the result also depends on the cleaning pads, liquid dispensing, and route. Regardless of the specified pressure, the robot should be secured with a safety cable.

The backup power system uses a built-in battery to keep the window-cleaning robot attached to the glass in an emergency after the mains power goes out. It does not allow full cleaning to continue, but keeps the device attached to the glass and gives you time to remove it in the event of a sudden power outage or accidental cable disconnection. The specified time indicates how many minutes the system can maintain the robot’s adhesion to the glass without mains power.

The noise level indicates how loud the window cleaner operates: the lower the value, the more comfortable the device is to use indoors. Models quieter than 60 dB are comparable in volume to a calm conversation, the 60 – 65 dB range is already clearly audible, while devices above 65 dB may interfere with work or relaxation nearby. A robot produces sound throughout the entire cycle, whereas a handheld vacuum makes noise only while directly collecting water.