Roborock S8 Pro Ultra Robot Vacuum and Mop vs iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop
If you're looking for a top-of-the-line cleaning experience, the Roborock S8 Pro Ultra Robot Vacuum and Mop outshines the iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop with its impressive 6,000 Pa suction power versus an undisclosed stronger suction rating on the Roomba. This flagship model features an all-in-one RockDock Ultra that handles everything from emptying to washing the mop pad, while the Roomba requires manual maintenance for its mop pad. In real-world use, the Roborock's 5200 mAh battery lasts up to 180 minutes, making it suitable for larger spaces. Meanwhile, the Roomba's 4460 mAh battery only provides up to 120 minutes of runtime. These differences make the Roborock an appealing investment for those needing serious cleaning power and convenience in 2026. Key specs: Weight: 169.32 oz vs 143.92 oz and Suction Power: 6,000 Pa vs 100% stronger suction (not published).
Why compare these? The Roborock S8 Pro Ultra Robot Vacuum and Mop (premium flagship) and iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop (mid-range) represent different approaches to robot vacuums. While they may appeal to different budgets, many buyers consider both options. This 2026 comparison helps you decide if the differences justify the price gap.
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Key Differences at a Glance
| Aspect | Roborock S8 | iRobot Roomba |
|---|---|---|
| User Rating | ✓4★ (861 reviews) | 3.5★ (1,196 reviews) |
| Top Strength | Truly hands-off maintenance with the all-in-one RockDock Ultra (Washes, Dries, Refills, Empties) | Clean Base Auto-Fill Dock automates both dust emptying and water refilling |
| Main Drawback | High price point places it firmly in the luxury tier | Dock does not wash or dry the mop pad (requires manual maintenance) |
| Market Position | ✓Flagship | Mid-range |
Roborock S8 Pro Ultra Robot Vacuum and Mop
PreciSense LiDAR Navigation (Systematic route planning with adaptive algorithms).
LiDAR mapping (3D Mapping, Matrix Map, Quick Mapping, Multi-level mapping up to 4 floors).
Reactive 3D Obstacle Avoidance (Structured light + 3D infrared imaging; privacy-focused).
6,000 Pa (HyperForce Suction)
iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop
PrecisionVision Navigation (Camera-based VSLAM with object recognition and avoidance).
Imprint Smart Mapping (Stores up to 10 maps, room segmentation, room naming, and Keep Out Zones).
PrecisionVision with AI (Identifies and avoids cords, pet waste, shoes, socks, and seasonal items).
Not published (Rated 100% stronger suction vs. Roomba i-Series / 2x Power-Lifting Suction).
Only the specs that differ are shown here. Winners are highlighted when the data is clear.
+Full specs, pros, and cons
Everything side-by-side with ratings and the full spec list.
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Full specs, pros, and cons
Everything side-by-side with ratings and the full spec list.
Comparison: Roborock S8 Pro Ultra Robot Vacuum and Mop vs iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop
Roborock S8 Pro Ultra Robot Vacuum and Mop
iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop
| Criterion | Roborock S8 Pro Ultra Robot Vacuum and Mop | iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop |
|---|---|---|
| Rating | ★4(861)Amazon | ★3.5(1,196)Amazon |
Navigation | PreciSense LiDAR Navigation (Systematic route planning with adaptive algorithms). | PrecisionVision Navigation (Camera-based VSLAM with object recognition and avoidance). |
Mapping | LiDAR mapping (3D Mapping, Matrix Map, Quick Mapping, Multi-level mapping up to 4 floors). | Imprint Smart Mapping (Stores up to 10 maps, room segmentation, room naming, and Keep Out Zones). |
Obstacle Avoidance | Reactive 3D Obstacle Avoidance (Structured light + 3D infrared imaging; privacy-focused). | PrecisionVision with AI (Identifies and avoids cords, pet waste, shoes, socks, and seasonal items). |
Suction Pa | 6,000 Pa (HyperForce Suction) | Not published (Rated 100% stronger suction vs. Roomba i-Series / 2x Power-Lifting Suction). |
Brush System | DuoRoller Riser Brush (Dual counter-rotating rubber brushes that automatically lift for mopping-only mode). | Dual Multi-Surface Rubber Brushes (Resistant to hair tangles) + Edge-Sweeping Brush. |
Mopping | VibraRise 2.0 Sonic Mopping (Dual vibration modules scrubbing at 3,000 times/min with consistent pressure). | SmartScrub System (Back-and-forth scrubbing motion with consistent pressure). |
Mop Lift | 0.20" (5 mm) Automatic Mop Lifting | Auto-Retract Mopping System (Lifts mop pad to the top of the robot to keep carpets completely dry). |
Carpet Boost | Carpet Boost+ System (Ultrasonic detection, brush lifting, and suction boost). | Yes (Carpet Boost automatically increases suction on carpets). |
Battery | 14.4V / 5200 mAh Lithium-ion | 14.4V / 4460 mAh Lithium-ion |
Runtime | Up to 180 min (Quiet Mode) | Up to 120 min (Recharge and Resume supported) |
Charging Time | Approx. 4 hours (Supports 30% Fast Charging) | Approx. 3 hours |
Dustbin | 0.09 gal (350 mL) — Internal bin | 0.08 gal (313 mL) — Internal bin |
Water Tank | 0.05 gal (200 mL) — Internal tank (Auto-refilled by dock) | 0.05 gal (210 mL) — Internal tank (Auto-refilled by dock) |
Auto Empty | Yes | Yes |
Dock Type | RockDock Ultra (Emptying, Washing, Drying, Refilling, Self-Cleaning). Tanks: 3.5L Clean Water, 2.9L Dirty Water, 2.5L Dust Bag. Dims: 16.8" x 20.2" x 17.7". | Clean Base Auto-Fill Dock (Empties debris for up to 60 days, refills water for up to 30 days; 15.8" W x 16.4" D x 16.3" H). |
Mop Wash | Yes (Automatic mop washing during and after cleaning) | No (Pad requires manual washing) |
Mop Dry | Yes (Warm Air Drying for mop and dock base) | No |
Filtration | E11 Rated Washable Filter | High-Efficiency Filter (Captures 99% of cat and dog allergens) |
Noise Level | 68.5 dB (Balanced Mode) | Approx. 68 dB |
App Features | Roborock App (Smart No-Go Zones, Deep Carpet Cleaning, Floor Direction Cleaning, Off-Peak Charging). | iRobot Home App (Dirt Detective prioritizes dirty rooms, Clean While I'm Away, SmartScrub settings, Pet Owner Official Promise). |
Voice Assistants | Amazon Alexa, Google Home, Apple Siri Shortcuts. | Amazon Alexa, Google Assistant, Apple Siri. |
Multi Floor | Yes (Up to 4 map levels). | Yes (Imprint Smart Mapping stores multiple floor plans). |
Threshold Climb | 0.79" (20 mm) | 0.6" (1.6 cm) — Reduced slightly due to mopping mechanism |
Height | 3.80" (96.5 mm) | 3.40" (87 mm) |
Dimensions | 13.90" (L) x 13.80" (W) x 3.80" (H) | 13.70" (L) x 13.70" (W) x 3.40" (H) |
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Roborock S8 Pro Ultra Robot Vacuum and Mop
PreciSense LiDAR Navigation (Systematic route planning with adaptive algorithms).
LiDAR mapping (3D Mapping, Matrix Map, Quick Mapping, Multi-level mapping up to 4 floors).
Reactive 3D Obstacle Avoidance (Structured light + 3D infrared imaging; privacy-focused).
6,000 Pa (HyperForce Suction)
DuoRoller Riser Brush (Dual counter-rotating rubber brushes that automatically lift for mopping-only mode).
VibraRise 2.0 Sonic Mopping (Dual vibration modules scrubbing at 3,000 times/min with consistent pressure).
Pros
- Truly hands-off maintenance with the all-in-one RockDock Ultra (Washes, Dries, Refills, Empties)
- DuoRoller Riser brushes resist hair tangles and lift up for quiet mopping
Cons
- High price point places it firmly in the luxury tier
- Lacks an RGB camera for live video monitoring (unlike the S7 MaxV)
iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop
PrecisionVision Navigation (Camera-based VSLAM with object recognition and avoidance).
Imprint Smart Mapping (Stores up to 10 maps, room segmentation, room naming, and Keep Out Zones).
PrecisionVision with AI (Identifies and avoids cords, pet waste, shoes, socks, and seasonal items).
Not published (Rated 100% stronger suction vs. Roomba i-Series / 2x Power-Lifting Suction).
Dual Multi-Surface Rubber Brushes (Resistant to hair tangles) + Edge-Sweeping Brush.
SmartScrub System (Back-and-forth scrubbing motion with consistent pressure).
Pros
- Clean Base Auto-Fill Dock automates both dust emptying and water refilling
- Auto-Retract Mopping System is the industry standard for keeping high-pile carpets dry
Cons
- Dock does not wash or dry the mop pad (requires manual maintenance)
- Navigation and mapping are slower than LiDAR-based competitors
Which one is better?
The Roborock S8 Pro Ultra Robot Vacuum and Mop is the better buy for most people - its 6,000 Pa suction power crushes the competition.
Who should buy each?
Choose the Roborock S8 Pro Ultra Robot Vacuum and Mop if: you want hands-off maintenance with its RockDock Ultra, need maximum suction power of 6,000 Pa, or require longer runtime of up to 180 minutes.
Choose the iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop if: you want a stylish design, prioritize automatic emptying for up to 60 days, or need a more affordable option.
Quality Seekers
Higher user rating (4★ vs 3.5★) indicates better overall satisfaction
→ Choose Roborock S8
Premium Buyers
Higher-tier option with more premium features and build quality
→ Choose Roborock S8
Value Seekers
Better value proposition for buyers who don't need top-tier features
→ Choose iRobot Roomba
Truly hands-off maintenance Priority
Truly hands-off maintenance with the all-in-one RockDock Ultra (Washes, Dries, Refills, Empties)
→ Choose Roborock S8
Conclusion
We hope this comparison helps you buy with confidence. Both products are dependable; the right one depends on how you will use it.
Bottom line: The Roborock S8 Pro Ultra Robot Vacuum and Mop edges ahead with a 4★ rating compared to 3.5★. However, iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop remains a strong contender if its strengths align better with your needs.
Frequently Asked Questions
+Which is better: Roborock S8 Pro Ultra Robot Vacuum and Mop or iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop?
Roborock S8 Pro Ultra Robot Vacuum and Mop is the better choice if you prioritize truly hands-off maintenance with the all-in-one rockdock ultra (washes, dries, refills, empties). iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop wins if you value clean base auto-fill dock automates both dust emptying and water refilling. Both are rated highly (4★ vs 3.5★), so consider your specific needs and budget.
+What are the main differences between Roborock S8 Pro Ultra Robot Vacuum and Mop and iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop?
Key differences: Roborock S8 Pro Ultra Robot Vacuum and Mop offers truly hands-off maintenance with the all-in-one rockdock ultra (washes, dries, refills, empties), while iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop stands out with clean base auto-fill dock automates both dust emptying and water refilling. Consider that Roborock S8 Pro Ultra Robot Vacuum and Mop high price point places it firmly in the luxury tier. Meanwhile, iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop dock does not wash or dry the mop pad (requires manual maintenance). Check the detailed specs table above for a complete comparison.
+Where can US buyers get the best price?
For US buyers, Amazon typically offers competitive pricing with Prime shipping, easy returns, and reliable warranty support. We recommend comparing prices on both products using our affiliate links above—prices fluctuate regularly, and you may find sales or deals.
+Is this comparison up to date?
Yes, this comparison is current for 2026. We regularly verify specs, ratings, and availability. Last verified: January 27, 2026. PageBen uses affiliate links for monetization, but our recommendations are research-driven and independent.
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