Skip to main content

Review of the Kyvol Cybovac S31 Robotic Vacuum

Walter Shillington writes about products he knows firsthand. His articles focus on healthcare, electronics, watches, and household items.

Kyvol Cybovac S31 Robotic Vacuum

Kyvol Cybovac S31 Robotic Vacuum

Kyvol S31 Robot Vacuum Review

I have a cat. While Velvet is loads of fun, she can be unreasonably demanding. Every morning the greedy feline insists on fresh water, a bowl of food, and a good scratch. And she sheds hair like crazy.

Since mornings are not my best time of the day, I've tried to minimize the routine chores. A couple of months ago, I picked up a water fountain designed for cats, avoiding the need to put out a fresh bowl of water every day.

Another device that I've found useful is my robotic vacuum. This little robot starts up automatically each day, sucking up a surprisingly large accumulation of cat fur. All I'm required to do is empty the dustbin after the device returns to its dock.

Today I am reviewing a robotic vacuum that removes the necessity of performing even that minor chore.



The Kyvol Cybovac S31 tips the scales at seven pounds. It spans 13.8 inches and is 3.9 inches high. Three deck-mounted pushbuttons start the vacuum, initiate spot cleaning, and send the robot back to its dock.

The vacuum's dustbin, flanked by an assortment of sensors, slides into the robot's back edge. A rotating laser, perched above, alertly analyses its surroundings.

Located beneath the Cybovac S31 are two large rubber-coated drive wheels, an omnidirectional wheel, two side brushes, four drop sensors, a pair of dust emptying sensors, and the main brush. Two metal contacts, used to charge the battery, are positioned near the front of the robot.

This device is equipped with a 14.4V 5200mAh lithium battery capable of powering the Cybovac S31 for up to four hours.

No-go zones and barriers may be configured using the Kyvol application.

This robotic vacuum ships with a water tank intended for use when mopping the floor.

Kyvol has included a plethora of accessories. These consist of the charging dock, user's guide, cleaning brush, remote control, two spare side brushes, water tank, two washable mopping pads, 10 disposable mopping pads, a spare filter, and three dust bags for use with the dock.


  • Manufacturer: Kyvol
  • Model: Cybovac S31
  • Country of origin: China
  • Color: Black
  • Weight: 3.2 kilograms (7 pounds)
  • Diameter: 35 centimeters (13.8 inches)
  • Height: 9.9 centimeters (3.9 inches)
  • Dock dimensions: 255 x 225 x 348.4 millimeters (10 x 8.9 x 13.7 inches)
  • Dock weight: 3.45 kilograms (7.6 pounds)
  • Dock power requirement: Input 100-120V (US) / 220-240V (EU)
  • Battery: 5200mAh lithium; 14.4 volts
  • Battery charging time: 6.5 hours
  • Battery run time: 240 minutes (standard mode)
  • Dustbin: 500 milliliters (17 fluid ounces)
  • Dust bag for dock: 4300 milliliters (145 fluid ounces)
  • Scheduling: Yes
  • Voice control: Alexa and Google Home
  • Suction power: 3000PA
  • Suction levels: 4
  • Cleaning modes: Auto, Spot, Area, Edge
  • Cleaning technique: Suction, main brush, and side brushes
  • Mop capable: Yes
  • Mapping: Yes. Includes no-go zones and barriers
  • Multi-floor mapping: Yes
  • Water tank: 110 milliliters (3.7 fluid ounces)
  • Navigational system: LIDAR
  • Wi-fi capable: 2.4G
  • Climbing ability: 2 centimeters (0.8 inches)
  • Noise level: 45 dB (standard mode)
  • Carpet detect power boost: Yes
  • Filter: HEPA, not washable

The Manufacturer

Kyvol is trademarked by Shenzhen VanTop Technology & Innovation Co., Ltd.

The Cybovac S31 utilizes LIDAR (light detection and ranging) to design maps and navigate its cleaning area. The swiftly rotating laser calculates the distance by measuring the time it takes the laser beam to reach an obstruction and be reflected. This data is used to create an accurate map and guide the robotic vacuum as it travels from room to room.

The Dock

This system includes an automatic dust-emptying base. When the robotic vacuum returns to recharge, it hesitates as it approaches the dock, rotates 180 degrees, and then connects.

At this point, the dock's built-in vacuum noisily sucks debris from the robot's dustbin and deposits it into a large vacuum bag located within the base's upper compartment.

The robot then pulls away slightly and rotates back to its normal position, permitting it to re-dock and charge.

While this system saves little time and effort, it is a convenience that I very quickly became used to. On the more practical side, a dust-emptying base allows me to program the Cybovac S31 to vacuum my house every day, even when I am vacationing or on an extended business trip.

The Kyvol Application

This application provides the ability to select various options and to set barriers and no-go zones. It is continually undergoing improvements, and it has recently been updated to provide multilevel map support.


The last few robotic vacuums I've tested have proved to be very maneuverable, and the Cybovac S31 is no exception. It easily navigated the thick foam bathroom mat and my well-secured Turkish rug.

A black colored metal grating guards the air intake located within my front foyer. As soon as the Cybovac S31 climbed atop this obstacle, it immediately halted in fright and sent a frantic request for help to my cellphone.

Its anti-drop sensors had misidentified the dark-colored grate as a cliff, and the robot feared that it was in danger of falling. I corrected the problem by designating the grate as a no-go zone.

This robot can cross thresholds—the strip of wood at the bottom of doorways where rooms connect—of up to 2 centimeters (0.8 inches). Because some of my rooms have floors rising 1.25 inches above their neighbors', I have installed narrow ramps between them. The Cybovac did not experience difficulties coping with these hybrid thresholds.

Cleaning Routine

The Cybovac S31 circles and begins to edge clean after it enters a room. Once edge cleaning is complete, the robot switches to a Z pattern and continues to vacuum. Either the remote control or the Kyvol application may be used to point the robot toward a specific room or spot clean particularly dirty areas.

This vacuum can be scheduled to start at a specific time each day. Cleaning can also be initiated using the remote control, the Kyvol application, or merely pushing the vacuum's start button.

Floor Washing

The Cybovac S31 comes with a 110ml water tank that can be easily fitted with a cloth mop pad and clicked into place beneath the vacuum. Then, as the robot vacuums the floors, the damp cloth mop pad will wipe away the dust.

Additional no-go zones can be added that take effect only when in mopping mode. This ensures the robot will avoid carpeted rooms and mats.

A good floor mop and the application of a little elbow grease does a far better job. However, if you frequently use this moping system, you won't have to scrub the floor with a standard mop quite so often.

Battery Life

The Cybovac S31 is fitted with a 5200mAh lithium battery capable of providing power for up to four hours in standard mode. Available modes consist of Super Silent, Gentle, Standard, and Super-Power.

My medium-sized house can be cleaned within 44 minutes in standard mode. At this point, the battery level sits at about 75 percent.

Overall Impression

Although this robotic vacuum cannot be classified as a budget model, you get a lot of bang for your buck. It is fitted with a premium navigation system and benefits from excellent maneuverability, long battery life, and the ability to set no-go zones and barriers. It even comes with an automatic dust-emptying base and an effective mopping system.

If you are looking for a robotic vacuum suitable for a medium-sized to a large house, the Kyvol Cybovac S31 Robotic Vacuum should be on your shortlist.

This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.

© 2020 Walter Shillington