iRobot Roomba i3+ vs Roomba i8+

Further down the page, you’ll find some explanations regarding the key similarities and differences between the iRobot Roomba i3+ and the Roomba i8+.

But before checking out explanations regarding their design, cleaning performance, battery, and feature, here’s a table that summarizes the main technical summary sheet for these 2 robot vacuums:

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Design Comparison

Roomba i3+ measures 13.34 x 13.26 x 3.63 inches and weighs 15 pounds. Meanwhile, the Roomba i8+ measures 15.75 x 19.63 x 16.52 inches and weighs 7.28 pounds.

iRobot Roomba i3+ Robot Vacuum

Cleaning Performance Comparison

Suction Power & Noise

With a suction capacity of 1800 Pa, Roomba i3+ has a noise level of 68 dba. The Roomba i8+ has a suction power of 1700 Pa and a noise level of 68 dba.

Robot’s ability to walk

With a cleaning area of 170 m2, Roomba i3+ has a smaller cleaning area than Roomba i8+, with a cleaning area of 200 m2.

Thanks to the 20 mm (0.78 in) climbing ability, both of them are suitable for thicker carpets and can easily overpass a door threshold (if below 2 cm).

Both robots are equipped with a bunch of sensors that prevent bumping into things, falling, and keeping them at a distance of 10 mm from walls and furniture.

Dirt treatment

iRobot Roomba i3+ and Roomba i8+ both have dirt detection sensors. It is a system that recognizes high-traffic spots making a cleaner go over these zones a few times until it is clean

Roomba i3+ and i8+ both have a waste bin capacity of 400 ml.

When the dustbin inside the Roomba gets full, the robot vacuum returns to the charging dock, the base sucks up the debris from the container. When the Roomba is done emptying, it returns to continue cleaning. The base holds up to 30 robot bins, so you don’t have to empty it for about a month.


Under the lids of both dustbins, there is a HEPA filter that makes the robot safe for people with allergies and asthma. The filters of both Roomba are not removable for washing, you should change the filter every three months.

Ability to suck and sweep

Carpet boost: Roomba i8+ has a sensor that can recognize carpets. When the vacuum is on the carpet, its suction power is increased to the maximum level automatically cleaning deeper.

Side brush: Both have a side brush made of rubber.

Unique Dual Multi-Surface Rubber Brushes don’t get tangled with pet hair. Brushes adjust and flex to stay in constant contact with carpets and hard floors.

Cleaning Brush: Both are equipped with a cleaning brush that has detachable tips and is easier to clean since hair mostly gets clogged around the edges. In addition, the newest brush has 250% more bristles providing a better pickup.

Ability to Mop the floor: Both devices can only sweep and vacuum

iRobot Roomba i8+ Robot Vacuum

Battery Comparison

With 1800 mAh Lithium-Ion, Roomba i3+ can operate for about 75 minutes and takes 90 minutes to charge. Roomba i8+ uses a Lithium-Ion battery with a capacity of 2210 mAh that can work for about 90 minutes and takes 120 minutes to fully charge.

If both vacuums don’t finish all the work on a single charge, it will automatically return to the charging dock. Resume intends that the robot will resume from where it left off after charging is complete. This feature is perfect for large households where the robot cannot clean the entire house on a single charge

Feature Comparison


Unlike robots that don’t have a map and move randomly until the battery runs out, Roomba navigates efficiently. It moves back and forth in straight lines methodically covering the cleaning area based on the map it generates.

Roomba i8+ uses a camera, and odometry sensor to map your home layout; the Roomba i3+ uses a gyroscope + optic motion tracking sensor. The camera suffers in dark rooms.

Roomba i3+ cannot store maps in memory. Roomba i8+ can store 10 different maps in memory.

Schedule activities

The Roomba i3+ only has basic scheduling features. You can only schedule it to work at a specific time and day of the week.

Roomba i8+ has an advanced scheduling feature. After mapping, you can divide the map into separate regions and give each area a name. With this feature, you can schedule cleaning by area, no-go zone, selected room cleaning, schedule, etc.

Roomba i3+ does not have a digital virtual wall creation feature but you can buy an additional virtual wall barrier to create a no-go zone.. meanwhile, Roomba i8+ is equipped with a digital virtual wall creation feature that helps create a no-clean zone, Zoned cleaning.

Zoned cleaning: The robot cleans within a particular zone

No-Go zone: keeps the Roomba off some zones

Room cleaning: can be ordered (or scheduled) to clean in a certain room or two.


Manually control it like a radio car. If you need the device to go to a specific spot, you can use the app remote control and manage its movements by sending it where you want to. Also, with the «Target Point» option you can tap on the map, and the robot will go to that place. Much easier than using the remote control.

Additionally, you can control the two robot vacuums by setting voice prompts through Amazon Alexa Support and Google Assistant Assistant.

Activity tracking

When Roomba finishes cleaning, you can view the results in the cleaning history. Both cannot be tracked in real-time, you cannot see their location while the robot is vacuuming.

Quick Rundown Of iRobot Roomba i3+

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  • Short cleaning time
  • High attraction
  • Small cleaning area
  • There is no sensor to recognize the carpet
  • Advanced cleaning cannot be programmed

Quick Rundown Of iRobot Roomba i8+

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  • Large cleaning area
  • Large battery capacity
  • Advanced cleaning can be programmed
  • Real-time monitoring of cleaning is not possible

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