Robot vacuum cleaner Electrolux ER81UW3SW with charging base, bagless 0.3 L dust bin, 208 min runtime, 4 L clean water tank

The Electrolux ER81UW3SW is a white, bagless robot vacuum with an automatic base station designed for wet mopping and charging. It combines a compact dust container with a dedicated base station that holds clean water for mopping cycles. The robot offers a long runtime on a single charge and returns automatically to its base station when charging or docking is required.

Advantages

The bagless design simplifies emptying and reduces consumable costs, while the integrated wet mopping function allows both vacuuming and damp cleaning in one device. Automatic return to the base station ensures the robot docks for charging or refilling without manual intervention. Long runtime and a relatively short full charging time support extended cleaning sessions across medium to large areas.

Suitable for

• Routine vacuuming and damp mopping of hard floors
• Homes or apartments requiring unattended cleaning sessions
• Multi-room cleaning where long runtime is beneficial

When it may not be suitable

This robot is not intended for handling large volumes of dry debris continuously due to its 0.3 L dust container capacity; frequent emptying may be necessary in very dusty environments. It is also less suitable for carpets that require deep pile cleaning, since the product is optimized for hard-floor vacuuming and wet mopping.

Key specifications

• Colour: White
• Dust container capacity: 0.3 L
• Runtime per charge: 208 minutes
• Charging time: 6 hours
• Base station clean water capacity: 4 L
• Wet mopping function: yes
• Automatic docking/return to base: yes
• Diameter: 35.2 cm
• Robot weight: 12.8 kg; base station weight: 4.14 kg
• AC input frequency: 50–60 Hz

How to use

Place the base station on a level surface close to a power outlet and fill the base station clean water tank as required for mopping. Charge the robot fully before the first use; the device will return to the base station automatically when charging is needed. Use the robot on hard floors for combined vacuuming and wet mopping; empty the 0.3 L dust container regularly and refill or change water in the base station as recommended by the manufacturer.

What to consider before purchase

• Dust container capacity (0.3 L) and frequency of emptying needed for your home
• Suitability for your floor types — optimized for hard floors and damp mopping
• Space requirements for the base station (base station weight 4.14 kg and its footprint) and access to a nearby power outlet
• Planned cleaning area size relative to the 208-minute runtime

Usage recommendations

For best results, clear loose cables and small obstacles from floors before each run, empty the dust container after heavy cleaning sessions, and refill the base station water tank according to the mopping frequency to maintain consistent cleaning performance.