Introduction
The Roborock S8 MaxV Ultra and the Xiaomi X20 Max represent two high-end propositions within the robot vacuum market launched in 2024. Both units feature multifunction bases that automate the washing and drying of mops, which places them at a superior level compared to basic models. The Roborock model opts for a more complete integration of artificial intelligence systems, whilst the Xiaomi unit presents itself as an alternative with solid features at a more competitive price.
These robots are designed for users seeking total automation in home cleaning, especially in medium or large homes where daily maintenance can be demanding.
Power and Suction
Suction power marks a notable difference between these two models. The Roborock S8 MaxV Ultra reaches 10,000 Pa, a figure that exceeds the Xiaomi X20 Max by 2,000 Pa. This advantage can be particularly noticeable on medium or long pile carpets, where the capacity to extract embedded dust is crucial.
The brushing system presents different approaches. The S8 MaxV Ultra incorporates the dual DuoDivide brush, designed to push hair and dirt towards the centre of the robot to facilitate suction and reduce tangles. The X20 Max features the TriCut 3.0 brush, which combines bristles with blades that cut long hair to prevent it from wrapping around.
Only the Roborock model has a liftable main brush, a function that allows the roller to be raised during mopping to prevent it from getting unnecessarily wet. This is practical when mopping regularly, as the brush remains dry and ready for the next vacuuming session.
The extendable side brush of the S8 MaxV Ultra improves cleaning in corners and edges, something the Xiaomi doesn't offer. In homes with lots of furniture or hard-to-reach areas, this feature can make a difference to the final result.
Mopping
The mopping system is one of the aspects where these robots differ most. The Roborock employs a vibrating mop with a mini side mop that extends reach towards the edges, whilst the Xiaomi X20 Max uses two rotating mops with full extension to better cover floor boundaries.
Mop lift reaches 20 mm in the S8 MaxV Ultra, double the 10 mm of the Xiaomi model. This greater lifting capacity allows the Roborock to travel over thicker carpets without wetting the surface, which is especially useful in homes with a combination of hard floors and textiles.
Both bases wash the mops with hot water and dry them with hot air, ensuring hygiene and preventing bad odours. However, the Roborock incorporates dirt detection on both the mops and the floor, which allows it to re-clean particularly dirty areas automatically. The Xiaomi doesn't have this function, so it mops uniformly without adapting the intensity to detected dirt.
The detergent tank integrated into the S8 MaxV Ultra base adds cleaning product during mop washing, something the X20 Max doesn't offer. For those seeking deeper mopping without manual intervention, this feature can be decisive.
Navigation System
Both robots use a 3D LiDAR turret and front 3D laser sensor to map the home and avoid obstacles. Night vision LED is present in both models, allowing effective operation even in low light.
The main difference lies in the AI camera. The Roborock S8 MaxV Ultra features a dual camera with the ability to recognise up to 73 different objects, including pets. Additionally, it allows remote camera access, which adds a home surveillance function whilst the robot works. The Xiaomi X20 Max lacks an AI camera, so its obstacle recognition system relies exclusively on laser sensors.
The pet recognition of the Roborock model is especially useful in homes with dogs or cats, as the robot can identify them and adjust its behaviour to avoid disturbing them. It also features AI stain recognition, which allows it to detect visible dirt and act accordingly.
The RR Mason 11.0 processor of the S8 MaxV Ultra manages all this information with the SmartPlan 1.0 system, which optimises routes and cleaning strategies. The Xiaomi also has AI-powered intelligent cleaning, although without the level of detail provided by the Roborock's cameras.
Autonomy and Battery
Battery capacity is identical in both models: 5,200 mAh. However, effective battery life differs significantly. The Roborock S8 MaxV Ultra offers up to 180 minutes of continuous operation, compared to the 120 minutes of the Xiaomi X20 Max.
This one-hour difference can be decisive in large homes. In practice, the Roborock model can cover larger surfaces without needing to return to the base to recharge, which reduces total cleaning time. The Xiaomi, with 120 minutes, is still sufficient for most homes, but may require intermediate recharging in spaces exceeding 150 square metres.
Smart Functions
Both robots can overcome obstacles up to 20 mm in height, which allows them to move between rooms with small level changes or pass over thick carpets without getting stuck.
The Roborock S8 MaxV Ultra incorporates its own voice assistant, in addition to compatibility with Alexa and Google Home. This allows the robot to be controlled via voice commands without needing to open the mobile app. The Xiaomi X20 Max is only compatible with external assistants, which slightly limits voice control options.
Multifunction Cleaning Base
The bases of both models perform auto-emptying of the dust bin, mop washing with hot water and drying with hot air. The dust bag capacity is 2.5 litres in both cases, and the clean water tank holds 4 litres.
The dirty water tank presents a small difference: 3.5 litres in the Roborock versus 3.8 litres in the Xiaomi. This variation is minimal and doesn't represent a significant practical advantage.
The main distinction is in the detergent tank, present only in the S8 MaxV Ultra base. This tank allows cleaning product to be added which is dispensed during mop washing, improving hygiene and mopping results without manual intervention.
Neither model features self-cleaning of the washing tray, UV disinfection nor integrated plumbing connection. They also don't offer an optional kit for plumbing connection.
Dimensions
The diameter of both robots is practically identical: 353 mm in the Roborock and 350 mm in the Xiaomi. The relevant difference is in height. The Xiaomi X20 Max measures 97 mm, compared to the 103 mm of the S8 MaxV Ultra. Those additional 6 mm can make a difference in homes with low furniture, where the Xiaomi model has greater ease sliding underneath.
The bases also present differences. The Roborock's measures 409 mm wide, 470 mm high and 419 mm deep. The Xiaomi's is narrower (340 mm) but taller (563 mm), with a similar depth of 420 mm. It's worth considering available space before deciding, as the Xiaomi base occupies less floor surface but requires more clearance height.
Real-World Usage Experience
For large homes, the Roborock S8 MaxV Ultra offers clear advantages thanks to its greater battery life and suction power. The ability to work for 180 minutes without recharging allows large spaces to be covered in a single run, whilst the Xiaomi may need intermediate breaks in homes exceeding 150 square metres.
In homes with pets, the dual camera recognition of the S8 MaxV Ultra adds a level of intelligence that the Xiaomi cannot match. The DuoDivide brush also facilitates the management of long hair, although the X20 Max's TriCut 3.0 performs adequately in this aspect.
For those who prioritise passing under low furniture, the Xiaomi X20 Max has an advantage with its 97 mm height. Conversely, if the home has carpets of varying thickness, the 20 mm lift of the Roborock is more versatile.
Intensive mopping favours the Roborock model, which combines dirt detection, detergent tank and greater mop lift. The Xiaomi offers good mopping with its extendable rotating mops, but without the ability to adapt intensity according to detected dirt.
Conclusion: Which to Choose?
Choose the Roborock S8 MaxV Ultra if: you're seeking maximum battery life and power, you live in a large home, you have pets and want to take advantage of AI recognition, you value remote camera access for surveillance, you need dirt detection for adaptive mopping, or you prefer the convenience of the automatic detergent tank.
Choose the Xiaomi X20 Max if: your home has low furniture and you need a robot with lower height, you're looking for a competitive option with solid features at a more competitive price, you don't require advanced AI functions such as pet recognition or camera access, and you're satisfied with a 120-minute battery life sufficient for medium-sized spaces.
