6Rank 06 of 10 · Air Purifiers
Xiaomi Smart Air Purifier 4 Lite
The cheapest clean air here: 360 m³/h from about €121. Stiftung Warentest tested it in 2024 and gave 2.8, a middling result, and Xiaomi does not publish the noise at full speed.
7.3BPR score
- €121Price
- 360 m³/h — published by Xiaomi; TÜV Rheinland Allergy Care certificateParticle CADR in m³/h, as published by the manufacturer
- 6 of 10in Air Purifiers
- 7.3BPR score 0–10
Review
What this product is
Written after the analysis, from the same sources the score is built on: the manufacturer's documentation, available studies and verified owner feedback.
The 4 Lite is the budget pick for rooms up to about 30 m². Xiaomi publishes a particle CADR of 360 m³/h, and German shops listed on geizhals.de sell it from €120.80. That is about €0.34 per m³/h, by far the lowest in this ranking. The stated coverage of 25 to 43 m² corresponds to 3.5 to 6 air changes per hour, so the lower end of the range is realistic.
Unlike most budget units it has been through a consumer test. Stiftung Warentest graded it 2.8 in its 2024 round, according to geizhals.de and raumluft-helden.de: behind the Bosch Air 4000 (2.3) but a pass. We could not read the paywalled details.
The specification has gaps. Xiaomi quotes 33.4 dB(A) for night mode only; the noise at the speed where 360 m³/h is reached is not on the pages we opened. The filter is described as combining electrostatic charging with mechanical filtration for 99.97 % at 0.3 µm, with no EN 1822 class and no ozone statement. Power is 33 W, or 0.8 kWh over 24 hours. Filter life is 6 to 12 months, so costs can be double those of a 12-month filter.
No owner rating was visible on the pages we opened; the owner score is therefore a cautious placeholder.
Technical data
Specification
Figures from the manufacturer's documentation, verified against available outside sources. Values we could not confirm are marked as declared.
- Particle CADR
- 360 m³/h
- Room size claimed
- 25–43 m²
- Room size at 5 air changes/h (2.4 m ceiling)
- about 30 m² (our calculation)
- Filter
- 3-in-1; electrostatic charging plus mechanical filtration; 99.97 % at 0.3 µm
- EN 1822 class
- not published
- Noise
- 33.4 dB(A) in night mode; full speed not published
- Power
- 33 W; 0.8 kWh per 24 h
- Weight
- 4.8 kg (geizhals.de listing)
- Dimensions
- 240 × 533 × 240 mm (geizhals.de listing)
- Filter interval
- 6–12 months
- Certification
- TÜV Rheinland Allergy Care
- Stiftung Warentest
- 2.8 in the 2024 test (second-hand)
Component scores
Where the score
comes from.
Four components, equal weight, each on a 0–10 scale and each resting on a named source. The overall score is their mean — the full procedure is in the methodology.
What we liked
- 360 m³/h from €120.80: about €0.34 per m³/h, the lowest here
- Tested by Stiftung Warentest in 2024: 2.8 (second-hand source)
- TÜV Rheinland Allergy Care certificate
- 33 W maximum; 0.8 kWh per 24 hours
- Realistic lower room figure of 25 m², about six air changes per hour
Worth knowing
- Noise published for night mode only (33.4 dB(A)); full-speed figure missing
- Electrostatic charging, no EN 1822 class, no ozone statement on the page
- Filter life only 6–12 months
- Price is the lowest shop offer on geizhals.de, not Xiaomi's own store price
Comparison
How it compares
within the category
All values come from the same analysis and are comparable only within the category Air Purifiers.
| Product | Score | Particle CADR in m³/h, as published by the manufacturer | Price |
|---|---|---|---|
| Air 4000Top score | 8.4 | 300 m³/h — published by Bosch; not independently certified on the product page | €198 |
| Smart Air Purifier 4 LiteThis product | 7.3 | 360 m³/h — published by Xiaomi; TÜV Rheinland Allergy Care certificate | €121 |
| Category average10 products analysed | 7.4 | — | — |
FAQ
Frequently asked questions
Why is the price not from Xiaomi's own store?
Xiaomi's German product page showed no price when we opened it. €120.80 was the lowest of the shop offers listed on geizhals.de in October 2026; other shops there asked up to about €139.
How did the 4 Lite do at Stiftung Warentest?
It received 2.8 in the 2024 test, according to geizhals.de and raumluft-helden.de. The test winner, the Bosch Air 4000, scored 2.3. We could not see the sub-grades behind the paywall.
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