Roborock S8 Max Ultra with Refill & Drainage System

The dock connects to your household water supply and drain, so clean water for mop washing and tank refills arrives on demand and dirty water leaves on its own; there is no clean tank to fill or dirty tank to empty, which is why this dock is shorter (16.5 x 16.1 x 11.8 inches) than the tank version. Everything else matches the 8-in-1 RockDock Ultra: auto-emptying into a bag good for up to 7 weeks, 140 F hot water mop washing, heated drying, automatic detergent dosing from a 580 ml reservoir that lasts over 3 months, and base self-cleaning. You still change the dust bag and top up detergent.

Water pressure of 0.1 to 0.4 MPa (fit a pressure-reducing valve above that), a faucet or supply fitting of G1/2 or G3/8, and a drain outlet at least 0.015 m across; the kit includes a G1/2 connector plus a 6 m inlet hose and a 6 m G3/8 drain hose, and Roborock recommends keeping both connections within 6 m (19.7 ft) of the dock. No point on the drain line should sit more than 1 m (3.3 ft) above the floor, preferably under 50 cm, and the dock needs at least 30.5 cm (1 ft) of height, 42 cm (1.4 ft) of width, and 100 cm (3.3 ft) of depth with no step or threshold over 2 cm between it and the cleaning area. Laundry rooms, mudrooms, and under-sink cabinets are the typical spots.

Four carpet modes are available in the app. Rise lifts the mop up to 20 mm and stops water so the carpet is vacuumed; Avoid keeps the robot off carpet entirely; Ignore is for homes without carpet or mats that can be mopped; Cross drives over door mats without cleaning them. You can also enable Vacuum carpet first, which vacuums all mapped carpet before the robot washes its mop and cleans the rest, or Deep carpet cleaning, which vacuums carpets twice in a cross-hatch pattern. Very dark or shag carpet may still be refused because the cliff sensors read it as a drop.

VibraRise 3.0 uses two vibration modules that scrub up to 4,000 times per minute, and the mop rises up to 20 mm on carpet so the robot can vacuum and mop in one run without wetting rugs; a rotating edge mop spins at up to 185 rpm to within 1.68 mm of baseboards, while the FlexiArm side brush extends into corners and under furniture edges. The DuoRoller Riser Brush lifts in mop-only mode, when crossing tall thresholds, and when the robot returns to wash or charge. Reactive 3D obstacle avoidance uses 3D structured light (not an RGB camera, so there is no remote viewing) to recognize and steer around objects and shows them on the map, and the robot stops its main brush and moves aside when a pet approaches.

By default the robot returns every 15 minutes of mopping for a wash; adjust the interval on the wash settings page or start a wash by holding the dock button while the robot is docked. Four modes are offered: Smart adjusts water and duration to how dirty the mop is, Light saves time and water on clean floors, Balanced suits medium-sized homes, and Deep uses more water and a longer cycle, and the dock re-washes the mop and sends the robot back to re-mop areas that its dirt detection flags. For hot washing, confirm Mop Washing with Hot Water is enabled in the app: the dock heats the sink to about 140 F (60 C), but hot water is used mainly in the early stage of the wash to work with the detergent and the final temperature depends on room and tank temperature, so a finished mop feels warm rather than hot. To check, pause the wash about 30 seconds after it starts and feel the mop; afterward the dock dries the mop with 140 F heated air.

Auto-emptying only runs when the robot docks itself after a cleanup with the feature enabled; it skips runs that ended without cleaning, the Do Not Disturb window, and any time the dust container cover is off or the bag is full. The mop is only washed if it was used and the robot started from the dock, and auto-drying must be enabled in the app. A steady red dock light points to a missing dust container cover, a missing water filter, a water supply problem, or a voltage error; reduced emptying usually means the main brushes or brush cover are not seated.

It connects to 2.4 GHz Wi-Fi only; 5 GHz is not supported, so choose the 2.4 GHz network on a dual-band router. Amazon Alexa, Google Home, and Apple Siri are supported once the robot is linked in the Roborock app; for Alexa, say "Alexa, open robo rock" and then the command. If pairing fails, re-enter the password, allow location and local network permissions for the app, switch off any VPN, and avoid WEP security or special characters in the network name; without Wi-Fi the buttons still run full cleanups, spot cleans, and dock returns.

Clean the DuoRoller main brushes every 2 weeks and replace them every 6 to 12 months; clean the flexible side brush monthly and replace it every 3 to 6 months; rinse the washable filter every 2 weeks and replace it every 6 to 12 months; clean the VibraRise and edge mop cloths as needed and replace them every 3 to 6 months. Clean the dock's maintenance brush as needed and replace it every 6 to 12 months, rinse the water filter as needed, and replace the dust bag when full, roughly every 7 weeks. Use only cleaning solution recommended by Roborock, never disinfectant; operate between 39 and 104 F (4 to 40 C).

Put the dock on a hard, level floor against a wall with clear floor in front of the dock and at least 1 ft (30.5 cm) of height, 1.4 ft (42 cm) of width, and 3.3 ft (100 cm) of depth around the Refill and Drainage dock, keep that area clear, and wipe the signal window on the front of the dock and the robot's front sensor; a robot that was carried elsewhere or just finished a spot clean rebuilds its map and may need to be placed on the dock by hand. Error 13 means dirty charging contacts: wipe them and the dock contacts with a cloth dampened with rubbing alcohol, check that the dock light is on with the robot off it, unplug the dock for two minutes, and try another outlet. Error 1 means the LiDAR turret is blocked or not spinning (clear it and restart), Error 7 means a wheel is jammed, and Error 8 means the robot is trapped, so clear the obstacles around it. An internal error calls for a factory reset, and Error 42 means the maintenance brush in the dock's washing tray is jammed; clear it and retry, and contact Roborock support if any code keeps returning.

Roborock covers new products such as the S8 Max Ultra with a one-year limited warranty from the purchase date against defects in materials and workmanship. Consumables such as filters, brushes, mop cloths, and dust bags are not covered unless a defect in a non-consumable part damaged them, and normal wear, cosmetic damage, misuse, and commercial use are excluded. Keep your receipt: without proof of purchase the warranty period defaults to three months from the factory ship date. Warranty and technical support run through Roborock US at support@roborock.com or 1-855-960-4321 (24/7); RoboticsSelect is an authorized dealer, ships free within the contiguous U.S., and accepts standard returns within 30 days.