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Bosch Air 4000 Review | 45 Data compared

Avg. price:~£180Max. CADR:300 m³/hMaximum room area:62.5 m²Maximum noise level:49 dBHEPA filter:yesWeight:4 kg

Bosch Air 4000 Review: Compare 45 technical specifications and user reviews to see how this product ranks in the Air Purifiers category and whether it is worth buying.

Bosch Air 4000
7.3/10

Overall score

Score
7.3/ 10
✕
What it is
An overall evaluation of products in the Air Purifiers category, based on technical analysis and user reviews.
When it matters
When you need a quick reference for identifying the best products in the Air Purifiers category.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 63% of models
Score components

80%

6.9

Technical score

20%

8.6

User score

â–²Better than 63% of air purifiers
7.9

Value for money

Value for money
7.9/ 10
✕
What it is
An indicator that combines the overall score of products in the Air Purifiers category with their prices.
When it matters
When you are comparing products in the Air Purifiers category and want a good balance between quality and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 70% of models
Score components

70%

7.3

Overall score

30%

9.2

Price

â–²Better than 70%
6.9

Technical score

Technical score
6.9/ 10
✕
What it is
An assessment of technical performance for products in the Air Purifiers category across these key areas: Performance, Features, Design.
When it matters
When you want to compare products in the Air Purifiers category by technical performance, specifications, and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 60% of models
Score components

50%

6.0

Performance

40%

8.2

Features

10%

6.9

Design

â–²Better than 60%
8.6

User score

User score
8.6/ 10
✕
What it is
A rating that combines user reviews with the total review volume for products in the Air Purifiers category.
When it matters
When you want to know how products in the Air Purifiers category perform in everyday use and how reliable owners find them over time.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 77% of models
Score components

70%

9.1

User ratings

30%

7.5

Number of reviews

Based on 838 buyer reviews from online shops.
Read buyer reviews on Amazon →
How we calculate this
User ratings – average star rating across all shop listings, weighted by how many reviews each has, on a 1–10 scale.
Number of reviews – how many buyer reviews the product has, on a logarithmic scale; the 8% most-reviewed models in the category get 10.
â–²Better than 77%
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Best prices
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Best rankings
Available: ranking among products currently available (including other versions of this product).All: ranking among all products in the database.
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Technical Specifications of air purifier Bosch Air 4000

Technical score
Technical score
6.9/ 10
✕
What it is
An assessment of technical performance for products in the Air Purifiers category across these key areas: Performance, Features, Design.
When it matters
When you want to compare products in the Air Purifiers category by technical performance, specifications, and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 60% of models
Score components:

50%

6.0

Performance

40%

8.2

Features

10%

6.9

Design

6.9
User score
User score
8.6/ 10
✕
What it is
A rating that combines user reviews with the total review volume for products in the Air Purifiers category.
When it matters
When you want to know how products in the Air Purifiers category perform in everyday use and how reliable owners find them over time.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 77% of models
Score components

70%

9.1

User ratings

30%

7.5

Number of reviews

Based on 838 buyer reviews from online shops.
Read buyer reviews on Amazon →
How we calculate this
User ratings – average star rating across all shop listings, weighted by how many reviews each has, on a 1–10 scale.
Number of reviews – how many buyer reviews the product has, on a logarithmic scale; the 8% most-reviewed models in the category get 10.
8.6
Popularity
Popularity
7.5/ 10
✕
What it is
An indicator based on the number of reviews received by products in the Air Purifiers category.
When it matters
When you prefer products in the Air Purifiers category that have been chosen and reviewed by many other buyers.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 65% of models
Popularity:
Bosch Air 4000 has a popularity score of 7.5 points, which is higher than 65% of products in this category.
7.5
Value for money
Value for money
7.9/ 10
✕
What it is
An indicator that combines the overall score of products in the Air Purifiers category with their prices.
When it matters
When you are comparing products in the Air Purifiers category and want a good balance between quality and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 70% of models
Score components:

70%

7.3

Overall score

30%

9.2

Price

7.9
Power
26 W
Market range: <10 W – >68 W
This air purifier has a power output of 26 W, which is lower than that of 71.3% of air purifiers and the same as that of 1.7% of air purifiers.
Max. CADR
300 m³/h
Market range: <100 m³/h – >515 m³/h
This air purifier delivers a CADR of 300 m³/h, which is higher than that of 60.9% of air purifiers and the same as that of 2.5% of air purifiers.
Maximum room area
62.5 m²
Market range: <20 m² – >130 m²
This air purifier covers up to 62.5 m², which is larger than 62.6% of air purifiers.
N. of speeds
3
Market range: <3 – >5
This air purifier offers 3 fan speeds, which is more than 6.7% of air purifiers and the same as 48.6% of air purifiers.
Maximum noise level
49 dB
Market range: <32 dB – >61 dB
This air purifier reaches 49 dB at maximum speed, which is quieter than 73.8% of air purifiers and the same as 7.3% of air purifiers.
Show more
Air quality indicator
yes
This air purifier has an air-quality indicator. This feature is present on 65.4% of air purifiers.
Continuous purification
yes
This air purifier supports continuous purification. This feature is present on 86.3% of air purifiers.
Auto mode
yes
This air purifier has auto mode. This feature is present on 67% of air purifiers.
Timer
yes
This air purifier has a timer. This feature is present on 75% of air purifiers.
Maximum timer
12 hours
Market range: <8 hours – >24 hours
This air purifier features a maximum timer of 12 hours, which is longer than that of 67.2% of air purifiers and the same as that of 17.2% of air purifiers.
Show more
Color
white
Material
plastic
Display
yes
This air purifier has a display. This feature is present on 51.1% of air purifiers.
Display position
top
Control type
touch
Show more

Bosch Air 4000 vs the average air purifier

246810TotalPerformanceFeaturesDesign
  • Has a child lock
    This air purifier has a child lock; the average air purifier does not.
  • Supports 360° purification
    This air purifier supports 360° purification; the average air purifier does not.
  • 4 dB lower maximum noise level
    This air purifier runs quieter at maximum speed than the average air purifier (49 dB vs 53 dB).
    49 dB vs 53 dB
  • 0.02 % percentage points higher bacteria elimination
    This air purifier achieves higher certified bacteria elimination than the average air purifier (100 % vs 99.97 %).
    99.99 % vs 99.97 %
  • 25% higher CADR
    This air purifier provides a higher clean air delivery rate than the average air purifier (300 m³/h vs 240 m³/h).
    300 m³/h vs 240 m³/h
  • 13.5 m² larger room area
    This air purifier covers a larger room area than the average air purifier (62.5 m² vs 49 m²).
    62.5 m² vs 49 m²
  • Has a handle
    This air purifier has a handle; the average air purifier does not.
  • 4 hours longer timer
    This air purifier offers a longer timer duration than the average air purifier (12 hours vs 8 hours).
    12 hours vs 8 hours
  • 7.3% higher user score
    User score
    8.6/ 10
    ✕
    What it is
    A rating that combines user reviews with the total review volume for products in the Air Purifiers category.
    When it matters
    When you want to know how products in the Air Purifiers category perform in everyday use and how reliable owners find them over time.
    Score distribution
    â–¼
    â–¼
    <55-66-77-88-99-10
    Bosch Air 4000
    the average air purifier
    Bosch Air 4000 has a higher user score than the average air purifier (8.64 vs 8.048).
    8.64 vs 8.05
  • 4.6% better value for money
    Bosch Air 4000 offers better value for money than the average air purifier (7.86 vs 7.5).
    7.86 vs 7.52
  • 12.1% more popular
    Bosch Air 4000 is more popular than the average air purifier (7.47 vs 6.7).
    7.47 vs 6.67
  • Supports 360° purification
    This air purifier supports 360° purification; the average air purifier does not.
  • 4 dB lower maximum noise level
    This air purifier runs quieter at maximum speed than the average air purifier (49 dB vs 53 dB).
    49 dB vs 53 dB
  • 25% higher CADR
    This air purifier provides a higher clean air delivery rate than the average air purifier (300 m³/h vs 240 m³/h).
    300 m³/h vs 240 m³/h
  • 13.5 m² larger room area
    This air purifier covers a larger room area than the average air purifier (62.5 m² vs 49 m²).
    62.5 m² vs 49 m²
  • Has a child lock
    This air purifier has a child lock; the average air purifier does not.
  • 0.02 % percentage points higher bacteria elimination
    This air purifier achieves higher certified bacteria elimination than the average air purifier (100 % vs 99.97 %).
    99.99 % vs 99.97 %
  • 4 hours longer timer
    This air purifier offers a longer timer duration than the average air purifier (12 hours vs 8 hours).
    12 hours vs 8 hours
  • Has a handle
    This air purifier has a handle; the average air purifier does not.
  • 0.05 m longer power cord
    This air purifier features a longer power cord than the average air purifier (1.9 m vs 1.8 m).
    1.85 m vs 1.8 m
  • 12.5% lower weight
    This air purifier is lighter than the average air purifier (4 kg vs 4.57 kg).
    4 kg vs 4.57 kg
  • No washable prefilter
    This air purifier does not have a washable prefilter; the average air purifier does.
  • 11.5 W lower power
    This air purifier has a lower power output than the average air purifier (26 W vs 37.5 W).
    26 W vs 37.5 W
  • 7.1 cm greater depth
    This air purifier is deeper than the average air purifier (29.1 cm vs 22 cm).
    29.1 cm vs 22 cm
  • 1.8 cm wider width
    This air purifier is wider than the average air purifier (29.1 cm vs 27.3 cm).
    29.1 cm vs 27.3 cm
  • 28.6% more expensive
    Bosch Air 4000 is more expensive than the average air purifier (£180 vs £140).
    £180 vs £140
  • 37.9% larger external volume
    This air purifier has a larger overall volume than the average air purifier (42340.5 cm³ vs 30700.8 cm³).
    42,340.5 cm³ vs 30,700.8 cm³
  • 28.6% more expensive
    Bosch Air 4000 is more expensive than the average air purifier (£180 vs £140).
    £180 vs £140
  • 11.5 W lower power
    This air purifier has a lower power output than the average air purifier (26 W vs 37.5 W).
    26 W vs 37.5 W
  • No washable prefilter
    This air purifier does not have a washable prefilter; the average air purifier does.
  • 7.1 cm greater depth
    This air purifier is deeper than the average air purifier (29.1 cm vs 22 cm).
    29.1 cm vs 22 cm
  • 1.8 cm wider width
    This air purifier is wider than the average air purifier (29.1 cm vs 27.3 cm).
    29.1 cm vs 27.3 cm
  • 37.9% larger external volume
    This air purifier has a larger overall volume than the average air purifier (42340.5 cm³ vs 30700.8 cm³).
    42,340.5 cm³ vs 30,700.8 cm³

Video reviews

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Expert reviews

In-depth analysis and verdict from leading tech publications

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Summary of the review
Bosch Air 4000 Air Purifier Review

Third-party reviews

Based on 838 buyer reviews from online shops.
Reviews last updated: August 2026 · How we calculate this
Read buyer reviews on Amazon →

What we like about Bosch Air 4000

  • Extremely quiet operation, especially in night/silent mode (< 25 dB)
  • Easy to use with straightforward touchscreen controls on the display
  • Highly efficient automatic mode that dynamically adjusts to ambient air quality
  • No mobile app or internet connection required for standard operation, appealing to privacy-conscious users
  • Excellent filtration performance for pollen, dust, and general allergens
  • Completely darkens display panel and LED indicators during night mode
  • Low energy consumption

What we don't like about Bosch Air 4000

  • High replacement cost for the 3-in-1 integrated filters
  • Loud and noticeable fan noise when operating at maximum speed
  • Lacks smart features, mobile app integration, or voice control (unlike the 4000i model)
  • Physical footprint can feel a bit too large or bulky for smaller rooms
  • Less effective at completely neutralizing strong tobacco smoke odors

Verdict

The Bosch Air 4000 is a compact, floor-standing air purifier measuring 500 mm x 291 mm x 291 mm and weighing 5.8 kg, designed to clean rooms up to 62.5 m² (or up to 1,345 sq ft for single air exchanges). It features a 3-in-1 filtration system comprising a pre-filter, an activated carbon filter, and a HEPA H13 layer that eliminates 99.95% of airborne pollutants such as dust, pollen, pet dander, viruses, and odors. Key pros include its efficient Clean Air Delivery Rate (CADR) of 300 m³/h (177 CFM), a low energy consumption of 26 watts, an automated smart mode driven by a PM2.5 particle sensor, a color-coded LED air quality ring, and an ultra-quiet sleep mode that drops noise levels to 25 dB(A) while extinguishing all display lights. On the downside, this specific model lacks built-in Wi-Fi or app connectivity (which requires upgrading to the Air 4000i model), has a relatively loud maximum noise level of 49 dB(A) on its highest speed, and carries high ongoing costs due to required proprietary replacement filters every 6 to 12 months.

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