Quick Answer
The Xiaomi S40 offers stronger suction (4000Pa vs 3000Pa), better mopping with electronic water control, and LiDAR navigation. The H40 is a budget-friendly option with decent cleaning for small homes, but lacks the advanced mapping and mopping features of the S40. If you want thorough hands-free cleaning, choose the S40; if you're on a tight budget, the H40 still gets the job done.
Choosing between the Xiaomi Robot Vacuum H40 and S40 can feel like splitting hairs, but they cater to different needs. Both are solid robot vacuums, but the price difference reflects real performance gaps. Here's a head-to-head comparison to help you decide in 2026.
Suction Power: S40 Pulls Ahead
The S40 boasts 4000Pa of suction, while the H40 offers 3000Pa. That extra 1000Pa makes a noticeable difference on carpets and around baseboards. If you have pets or thick rugs, the S40 will pull out more embedded dirt. For hard floors and low-pile carpets, the H40's suction is still sufficient. For more on why suction matters, check out our guide: What Is Suction power or suction? (A Plain-English Guide for First-Time Buyers).
Navigation and Mapping: LiDAR vs Gyroscope
The S40 uses LiDAR navigation, creating precise maps of your home, remembering room layouts, and avoiding obstacles like furniture and cords. The H40 relies on gyroscope navigation, which works but is less accurate. It may bump into things more and miss spots. If you want efficient, systematic cleaning without missed corners, the S40 is worth the extra cost. The S40 also supports no-go zones and room-specific cleaning, while the H40 only offers basic spot and edge cleaning.
Mopping Performance: Electronic Water Control
Both models mop, but the S40 wins again with electronic water control—you can adjust water flow via the app depending on floor type. The H40 uses a simple gravity-based drip system, which can oversaturate floors or run dry unevenly. For homes with tile or laminate, the S40 provides consistent, dwell-free mopping. The S40 also lifts its mop slightly when crossing carpets to avoid soaking them, a feature the H40 lacks. Learn more about carpet detection in our guide: What Is Carpet detection? (A Plain-English Guide for First-Time Buyers).
Battery, Dustbin, and Smart Features
The S40 packs a 5200mAh battery compared to the H40's 3200mAh—so it cleans longer without recharging. Both support app control, voice assistants, and scheduling. The S40 also comes with a larger 550ml dustbin and 270ml water tank, while the H40 has smaller bins (400ml dustbin / 200ml water tank). If you have a large home, the S40's bigger capacity means fewer empty cycles.
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Conclusion
The Xiaomi S40 is clearly the better performer for most homes, especially if you have carpets, pets, or need reliable mopping. The H40 remains a decent entry-level option for small apartments or budget-conscious buyers who don't mind a bit of manual intervention. In 2026, go with the S40 if you can stretch the budget—you'll thank yourself every time it quietly cleans your home without you lifting a finger.
Frequently Asked Questions
Which Xiaomi robot vacuum has stronger suction, H40 or S40?
The Xiaomi S40 has 4000Pa suction, while the H40 has 3000Pa. The S40 is better for carpets and pet hair.
Does the Xiaomi H40 or S40 have better mopping features?
The S40 has electronic water control and lifts the mop on carpets. The H40 uses a gravity drip, which isn't as precise.
Can the Xiaomi H40 avoid obstacles like furniture?
The H40 uses gyroscope navigation, so it's less precise than the S40's LiDAR. It may bump into objects more often.
Which model is cheaper, H40 or S40?
The Xiaomi H40 is typically more affordable, making it a good budget choice. The S40 costs more but offers significantly better performance.