Quick Answer
The Xiaomi S40 ($350) beats the H40 ($250) with stronger suction (4000Pa vs 2500Pa) and LiDAR navigation, while the H40 relies on gyro guidance. For pet owners or carpeted homes, the S40 is the clear winner; for budget-conscious buyers with hard floors, the H40 still does a solid job.
Introduction
Choosing between the Xiaomi robot vacuum S40 vs H40 can be tricky. Both are affordable mid-range robots from the same brand, but they target different needs. This comparison breaks down their differences so you can pick the right one for your floors — without overpaying or missing features you'll actually use.
Navigation & Mapping: LiDAR vs Gyro
The S40 uses LiDAR navigation, which creates a detailed floorplan of your home. It scans rooms quickly, remembers multiple maps, and avoids obstacles better. You can set no-go zones, schedule room‑by‑room cleaning, and even control it remotely with the Mi Home app.
The H40, by contrast, relies on gyroscope navigation — it follows a zigzag pattern without building a permanent map. It won't recognize individual rooms or let you draw virtual walls. If you want the convenience of “clean the kitchen only” or “stay off the rug,” the S40 is the only choice here.
For a deeper dive into how navigation affects cleaning, check out our guide on carpet detection — a feature that works much better with LiDAR-equipped robots.
Suction Power & Cleaning Performance
| Model | Suction | Suitable for |
|---|---|---|
| S40 | 4000Pa | Carpets, pet hair, large debris |
| H40 | 2500Pa | Hard floors, low‑pile rugs |
The S40 pulls 4000Pa of suction — enough to lift embedded dirt from medium‑pile carpets and handle daily pet fur. The H40 tops out at 2500Pa, which is fine for tile or wood but struggles on thick carpets. Both have a standard brush roll, but the S40’s rubber fins are quieter and less prone to hair tangles.
If you’re still learning what vacuum specs mean, read our simple explanation of suction power — it will help you compare any robot vacuum more confidently.
Mopping: Both Can Mop, but Only One Does It Properly
Both models come with a water tank and mopping pad. The S40 gets electronic water control so you can adjust the flow for different floor types — drip less on kitchen tile, more on wood. The H40 uses a gravity feed system; water drips constantly, which can leave puddles if the robot stops.
Neither model lifts the mop pad when crossing carpet, so you’ll need to physically remove it or set no‑go zones with the S40. For pet owners who worry about muddy paw prints, the S40’s controlled mopping is the better bet. (If you have pets and want a self‑washing mop, check our Eufy X10 Pro Omni pet mess review — but that’s a different price tier.)
Battery, Noise & Smart Features
Both robots run about 110‑130 minutes on a charge, enough for most apartments under 1,500 sq ft. The S40 supports voice control via Alexa and Google Assistant; the H40 only works with Xiaomi’s app.
Noise levels are similar — around 55‑60 dB on standard mode. If you’re cleaning during nap time, the S40 might be a fraction quieter due to its rubber brush roll. For more options on silent cleaning, our article on the quietest robot vac for baby naps lists several models that go even lower.
Price & Verdict
- Xiaomi S40: ~$350 — best for homes with carpets, pets, or anyone who wants smart mapping.
- Xiaomi H40: ~$250 — a capable entry‑level robot for small, hard‑floor apartments.
If your budget allows, the S40’s LiDAR navigation and stronger suction make it worth the extra $100. The H40 is fine for a dorm room or a kitchen‑only clean, but it lacks the polish that makes robot vacuums truly hands‑off.
Conclusion
When comparing Xiaomi robot vacuum S40 vs H40, the answer comes down to your floor type and how much control you want. The S40 is the smarter, more powerful choice — especially for carpets and pet homes. The H40 is a budget ticket to basic automation. Either way, you’re getting reliable cleaning from a brand that does mid‑range vacuums well.
Frequently Asked Questions
Does the Xiaomi S40 or H40 have better navigation?
The S40 uses LiDAR for smart mapping and room‑by‑room cleaning. The H40 uses gyroscope navigation that follows a random zigzag pattern and cannot create persistent maps. For precise cleaning, choose the S40.
Can the Xiaomi H40 handle pet hair?
Yes, but it may struggle on carpets. With 2500Pa suction, it picks up surface hair on hard floors but can leave embedded fur on rugs. The S40’s 4000Pa suction and rubber brush roll are better for pet owners.
Is one model quieter than the other?
Both are around 55‑60 dB on standard mode. The S40’s rubber brush tends to be slightly less noisy on carpets. If noise is a top concern, consider dedicated quiet models like the Eufy X10 Pro Omni or Dreame L10s Ultra.
Which Xiaomi vacuum is better for hard floors?
Both work well on hard floors, but the H40 is sufficient since it doesn’t need high suction. The S40 offers more precise mopping with electronic water control. For hard floors only, the H40 saves money.