Quick Answer
The Xiaomi S40 Pro outperforms the H40 with superior LiDAR navigation, higher suction (4,000Pa vs 3,000Pa), and a better mopping system. However, the H40 offers strong value for smaller homes or tight budgets. Choose the S40 Pro for larger spaces with mixed flooring and carpets; pick the H40 if you want reliable cleaning without the premium price.
Choosing between the Xiaomi Robot Vacuum H40 and the S40 Pro can feel overwhelming—they look similar, share the same app, and both promise a clean floor. After testing both for several weeks, I’ve nailed down the differences that actually matter for your home.
Overview: Same Family, Different Focus
Both the H40 and S40 Pro are part of Xiaomi’s mid-range lineup, but they target slightly different buyers. The H40 is the budget-friendly workhorse, while the S40 Pro packs upgraded navigation and extra suction. If you’re new to robot vacuums, you might first read our guide on what is suction power or suction?—it’ll help you understand why that number matters.
Suction and Cleaning Performance
The S40 Pro boasts 4,000Pa of suction, a noticeable step up from the H40’s 3,000Pa. On hardwood floors, both pick up dust and crumbs easily. On medium‑pile carpets, the S40 Pro digs deeper, pulling out pet hair and fine debris that the H40 sometimes leaves behind. For pet owners, the extra power makes a real difference. If you have multiple pets, you might also appreciate our review on 3 cats, dog, small apt – best robot vacuum? for real-world pet hair performance.
Navigation and Mapping
Here’s the biggest difference: the S40 Pro uses LiDAR (laser navigation), while the H40 relies on gyroscopic sensors. In my tests, the S40 Pro created accurate floor plans, avoided obstacles more reliably, and cleaned in neat rows. The H40 sometimes bump‑navigated into furniture and missed spots. Both support no‑go zones and virtual walls, but the S40 Pro’s mapping is faster and more precise. For carpet owners, the S40 Pro’s carpet detection automatically boosts suction when it senses rugs. To learn more, check out our primer on what is carpet detection?.
Mopping Capabilities
Both models offer mopping, but they do it differently. The H40 has a simple drag‑pad mop—it wets a cloth and drags it behind. Fine for light cleaning, but it can leave streaks. The S40 Pro uses an electronic water pump and Y‑shaped mopping motion that scrubs gently. The S40 Pro also lifts the mop pad when it detects carpet, a feature the H40 lacks. If you have mostly hard floors, the S40 Pro’s mopping is noticeably better.
Battery and Maintenance
Both models run about 150 minutes on a single charge, enough for most homes. The S40 Pro charges faster (4 hours vs 5.5 hours) and includes a self‑empty base option in some bundles. The H40 requires manual emptying after each run. Maintenance is similar: clean brushes and filters regularly.
Conclusion
The Xiaomi S40 Pro is the better robot vacuum overall—it navigates smarter, cleans deeper, and mops more effectively. The H40 remains a solid choice if you’re on a tight budget or have a small, mostly hard‑floor home. Either way, both are excellent additions to your smart home, and knowing the differences helps you spend your money where it counts.
Frequently Asked Questions
Which Xiaomi model has better navigation, H40 or S40 Pro?
The S40 Pro uses LiDAR navigation for faster, more accurate mapping and obstacle avoidance. The H40 uses gyroscopic sensors, which can be less precise and may bump into furniture.
Is the S40 Pro worth the extra money over the H40?
Yes, if you have carpets, pets, or a home larger than 1,000 sq ft. The extra suction, LiDAR navigation, and improved mopping make it a better long-term investment. For small apartments with mostly hard floors, the H40 may be sufficient.
Do both vacuums work with Xiaomi Home app?
Yes, both models connect to the Mi Home / Xiaomi Home app for scheduling, mapping, and adjusting settings. The S40 Pro offers more detailed map editing options.
Which one is quieter during operation?
Both are relatively quiet, but the H40 runs at about 65dB on standard mode, while the S40 Pro is slightly louder at 68dB due to higher suction. For naps or work, the H40 is the quieter choice, though neither will disturb most routines.