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Bosch Air 4000 Review | 46 Data compared

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  • Avg. price in UK: ~£180
  • Avg. price in US: ~$250
  • Max. CADR: 300 m³/h
  • Maximum room area: 62.5 m²
  • Maximum noise level: 49 dB
  • HEPA filter: yes
  • Weight: 4 kg

Bosch Air 4000 review. Compare 46 technical specifications and user reviews to see how this product ranks in the Air Purifiers category and whether it is worth buying.

7.4

Overall score

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 components:

80.0%

6.9

Technical Score

20.0%

9.1

User score

Very good
6.9

Technical Score

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 components:

50.0%

5.9

Performance

40.0%

8.2

Features

10.0%

6.9

Design

Good
9.1

User score

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 components:

70.0%

9.1

User reviews

30.0%

9.1

Popularity

User score:
United Kingdom
amazon
4.6
(705)
amazon
4.4
(88)
United States
Amazon_logo.png
4.4
(45)

(Reviews last updated: August 2026)

Exceptional
  • 7.2
    Bedroom use

    Score components:

    35.0%

    5.8

    Maximum noise level

    30.0%

    10

    Night mode

    20.0%

    5.3

    Maximum room area

    15.0%

    7.4

    Weight

  • 7.0
    Allergy relief

    Score components:

    35.0%

    6.7

    Max. CADR

    30.0%

    10

    HEPA filter

    20.0%

    5.5

    Number of filtration stages

    15.0%

    4.0

    Washable prefilter

  • 8.1
    Smoke removal

    Score components:

    35.0%

    10

    Activated carbon filter

    30.0%

    6.7

    Max. CADR

    20.0%

    5.5

    Number of filtration stages

    15.0%

    10

    Air quality indicator

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Best prices in UK

Best rankings

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Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

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.

Technical Specifications of air purifier Bosch Air 4000

Technical Score

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 components:

50.0%

5.9

Performance

40.0%

8.2

Features

10.0%

6.9

Design

6.9
Bosch Air 4000 has a technical score of 6.94 points, which is higher than 65% of products in this category.
User score

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 components:

70.0%

9.1

User reviews

30.0%

9.1

Popularity

User score:
United Kingdom
amazon
4.6
(705)
amazon
4.4
(88)
United States
Amazon_logo.png
4.4
(45)

(Reviews last updated: August 2026)

9.1
Bosch Air 4000 has a user score of 9.13 points, which is higher than 77.1% of products in this category.
Popularity
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.
9.1
Bosch Air 4000 has a popularity of 9.1 points, which is higher than 66.7% of products in this category.
Ratio quality/price

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 components:

60.0%

7.4

Overall score

40.0%

9.2

Price

7.9
Bosch Air 4000 has a quality-to-price ratio of 7.9 points, which is higher than 72.7% of products in this category.
Power
What it is: The electrical power consumption of the air purifier during operation, measured in watts (W).
When it matters: Helpful for estimating long-term electricity costs, particularly when running the unit continuously day and night.

Importance: HIGH

26 W
Bosch Air 4000 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
What it is: The Clean Air Delivery Rate (CADR), measuring the volume of purified air delivered per hour in cubic metres.
When it matters: Crucial for determining how rapidly the purifier circulates and cleans room air, especially for severe allergies or larger spaces.

Importance: HIGH

300 m³/h
Bosch Air 4000 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
What it is: The maximum recommended floor area (in square metres) that the air purifier can effectively treat.
When it matters: Essential for matching the purifier's airflow capacity to your room size so all air is filtered thoroughly.

Importance: HIGH

62.5 m²
Bosch Air 4000 covers up to 62.5 m², which is larger than 62.6% of air purifiers.
N. of speeds
What it is: The number of manual airflow speed levels available to choose on the air purifier.
When it matters: Provides flexible control between whisper-quiet low speeds for sleeping and powerful high speeds for fast room clearing.

Importance: MEDIUM

3
Bosch Air 4000 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
What it is: The sound level emitted by the air purifier when running at its highest fan speed, measured in decibels (dB).
When it matters: Important if you plan to use the purifier in bedrooms, nurseries, or home offices where loud fan noise causes disturbance.

Importance: HIGH

49 dB
Bosch Air 4000 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
What it is: An optical or laser sensor system displaying real-time indoor pollution levels via color rings or numerical values.
When it matters: Provides immediate visual feedback on air cleanliness and confirms that the purifier is working effectively.

Importance: MEDIUM

yes
Bosch Air 4000 has an air-quality indicator. This feature is present on 65.4% of air purifiers.
Continuous purification
What it is: Engineered motor and filter architecture designed for safe, uninterrupted 24/7 operation without thermal degradation.
When it matters: Essential for maintaining permanently low allergen and dust concentrations in polluted urban areas or high-pollen seasons.

Importance: LOW

yes
Bosch Air 4000 supports continuous purification. This feature is present on 86.3% of air purifiers.
Auto mode
What it is: An intelligent operating mode that automatically increases or decreases fan speed based on live sensor pollution readings.
When it matters: Maximizes convenience and saves electricity by running quietly on low speed and ramping up only when pollution is detected.

Importance: MEDIUM

yes
Bosch Air 4000 has auto mode. This feature is present on 67% of air purifiers.
Timer
What it is: A programmable shut-off countdown timer that turns off the air purifier automatically after a set number of hours.
When it matters: Convenient for running the unit for a specific duration before leaving home or going to bed without wasting electricity.

Importance: LOW

yes
Bosch Air 4000 has a timer. This feature is present on 75% of air purifiers.
Maximum timer
What it is: The longest selectable countdown duration available on the air purifier's timer, expressed in hours.
When it matters: Relevant if you prefer setting extended automated operating cycles, such as a full 8-hour workday or 12-hour overnight window.

Importance: LOW

12 hours
Bosch Air 4000 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
What it is: The primary exterior color and aesthetic finish of the air purifier housing.
When it matters: Important for ensuring the appliance blends harmoniously into your room decor and furniture style.

Importance: LOW

white
Material
What it is: The primary manufacturing material used for the outer casing, such as ABS plastic, polycarbonate, or aluminum.
When it matters: Influences structural rigidity, scratch resistance, premium appearance, and ease of wiping clean.

Importance: LOW

plastic
Display
What it is: An integrated digital screen showing active fan speed, particulate pollution numbers, filter health, and active timers.
When it matters: Enables quick visual checks of air metrics and purifier settings directly on the device without picking up your phone.

Importance: LOW

yes
Bosch Air 4000 has a display. This feature is present on 51.1% of air purifiers.
Display position
What it is: The physical placement of the display screen on the body of the air purifier (e.g., top panel or front facade).
When it matters: Affects viewing convenience: top displays are easiest to read while standing, while front displays are visible from across the room.

Importance: LOW

top
Control type
What it is: The user interface mechanism for operating the device, such as capacitive touch keys, push buttons, or rotary dials.
When it matters: Determines tactile responsiveness, ease of operation in dark rooms, and durability over years of regular use.

Importance: LOW

touch
Show more

Bosch Air 4000 vs the average air purifier

  • Has a child lock
    Bosch Air 4000 has a child lock; the average air purifier does not.
    What it is: A safety lock feature that disables the on-device control panel buttons to prevent unintended changes.
    When it matters: Essential in households with curious toddlers or pets who might accidentally switch off the purifier or alter speed settings.

    Importance: MEDIUM

    Bosch Air 4000 has a child lock; the average air purifier does not.
  • Supports 360° purification
    Bosch Air 4000 supports 360° purification; the average air purifier does not.
    What it is: A cylindrical or multi-directional intake design that draws in polluted room air from all surrounding angles.
    When it matters: Improves airflow circulation and offers versatile room placement without needing to position the intake toward open space.

    Importance: MEDIUM

    Bosch Air 4000 supports 360° purification; the average air purifier does not.
  • 4 dB lower maximum noise level
    Bosch Air 4000 runs quieter at maximum speed than the average air purifier (49 dB vs 53 dB).
    What it is: The sound level emitted by the air purifier when running at its highest fan speed, measured in decibels (dB).
    When it matters: Important if you plan to use the purifier in bedrooms, nurseries, or home offices where loud fan noise causes disturbance.

    Importance: HIGH

    Bosch Air 4000 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
    Bosch Air 4000 achieves higher certified bacteria elimination than the average air purifier (100% vs 99.97%).
    What it is: The certified laboratory efficiency percentage demonstrating the purifier's ability to eliminate airborne bacteria and microbes.
    When it matters: Reassuring for hygiene-focused households, medical offices, or homes with infants where airborne pathogen reduction is a priority.

    Importance: MEDIUM

    Bosch Air 4000 achieves higher certified bacteria elimination than the average air purifier (100% vs 99.97%).99.99 % vs 99.97 %
  • 25% higher CADR
    Bosch Air 4000 provides a higher clean air delivery rate than the average air purifier (300 m³/h vs 240 m³/h).
    What it is: The Clean Air Delivery Rate (CADR), measuring the volume of purified air delivered per hour in cubic metres.
    When it matters: Crucial for determining how rapidly the purifier circulates and cleans room air, especially for severe allergies or larger spaces.

    Importance: HIGH

    Bosch Air 4000 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
    Bosch Air 4000 covers a larger room area than the average air purifier (62.5 m² vs 49 m²).
    What it is: The maximum recommended floor area (in square metres) that the air purifier can effectively treat.
    When it matters: Essential for matching the purifier's airflow capacity to your room size so all air is filtered thoroughly.

    Importance: HIGH

    Bosch Air 4000 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
    Bosch Air 4000 has a handle; the average air purifier does not.
    What it is: An integrated carry handle or recessed hand grip built into the chassis for lifting.
    When it matters: Makes transporting the air purifier between bedrooms, living areas, or up and down stairs safer and effortless.

    Importance: LOW

    Bosch Air 4000 has a handle; the average air purifier does not.
  • 4 hours longer timer
    Bosch Air 4000 offers a longer timer duration than the average air purifier (12 hours vs 8 hours).
    What it is: The longest selectable countdown duration available on the air purifier's timer, expressed in hours.
    When it matters: Relevant if you prefer setting extended automated operating cycles, such as a full 8-hour workday or 12-hour overnight window.

    Importance: LOW

    Bosch Air 4000 offers a longer timer duration than the average air purifier (12 hours vs 8 hours).12 hours vs 8 hours
  • Supports 360° purification
    Bosch Air 4000 supports 360° purification; the average air purifier does not.
  • 4 dB lower maximum noise level
    Bosch Air 4000 runs quieter at maximum speed than the average air purifier (49 dB vs 53 dB).
  • 25% higher CADR
    Bosch Air 4000 provides a higher clean air delivery rate than the average air purifier (300 m³/h vs 240 m³/h).
  • 13.5 m² larger room area
    Bosch Air 4000 covers a larger room area than the average air purifier (62.5 m² vs 49 m²).
  • Has a child lock
    Bosch Air 4000 has a child lock; the average air purifier does not.
  • 0.02 % percentage points higher bacteria elimination
    Bosch Air 4000 achieves higher certified bacteria elimination than the average air purifier (100% vs 99.97%).
  • 4 hours longer timer
    Bosch Air 4000 offers a longer timer duration than the average air purifier (12 hours vs 8 hours).
  • Has a handle
    Bosch Air 4000 has a handle; the average air purifier does not.
  • 0.05 m longer power cord
    Bosch Air 4000 features a longer power cord than the average air purifier (1.9 m vs 1.8 m).
  • 12.5% lower weight
    Bosch Air 4000 is lighter than the average air purifier (4 kg vs 4.57 kg).

Total
Overall
Performance
Features
Design
  • 11.5 W lower power
    Bosch Air 4000 has a lower power output than the average air purifier (26 W vs 37.5 W).
  • No washable prefilter
    Bosch Air 4000 does not have a washable prefilter; the average air purifier does.
  • 7.1 cm greater depth
    Bosch Air 4000 is deeper than the average air purifier (29.1 cm vs 22 cm).
  • 1.8 cm wider width
    Bosch Air 4000 is wider than the average air purifier (29.1 cm vs 27.3 cm).
  • 11083.48 cm³ larger external volume
    Bosch Air 4000 has a larger overall volume than the average air purifier (42340.5 cm³ vs 31257.025 cm³).
  • No washable prefilter
    Bosch Air 4000 does not have a washable prefilter; the average air purifier does.
    What it is: A reusable outer mesh screen that traps hair, pet fur, and coarse dust, and can be rinsed clean under running water.
    When it matters: Substantially extends the lifespan of expensive inner HEPA and carbon filters by stopping large debris from clogging them.

    Importance: MEDIUM

    Bosch Air 4000 does not have a washable prefilter; the average air purifier does.
  • 11.5 W lower power
    Bosch Air 4000 has a lower power output than the average air purifier (26 W vs 37.5 W).
    What it is: The electrical power consumption of the air purifier during operation, measured in watts (W).
    When it matters: Helpful for estimating long-term electricity costs, particularly when running the unit continuously day and night.

    Importance: HIGH

    Bosch Air 4000 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
    Bosch Air 4000 is deeper than the average air purifier (29.1 cm vs 22 cm).
    What it is: The front-to-back depth measurement of the air purifier, in centimetres (cm).
    When it matters: Determines how far the purifier protrudes outward into walkways or away from walls.

    Importance: LOW

    Bosch Air 4000 is deeper than the average air purifier (29.1 cm vs 22 cm).29.1 cm vs 22 cm
  • 1.8 cm wider width
    Bosch Air 4000 is wider than the average air purifier (29.1 cm vs 27.3 cm).
    What it is: The horizontal width across the front of the air purifier, measured in centimetres (cm).
    When it matters: Essential for confirming the unit fits neatly between furniture, in tight corners, or on compact bedside tables.

    Importance: LOW

    Bosch Air 4000 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).
    Bosch Air 4000 is more expensive than the average air purifier (£180 vs £140).£180 vs £140
  • 11083.48 cm³ larger external volume
    Bosch Air 4000 has a larger overall volume than the average air purifier (42340.5 cm³ vs 31257.025 cm³).
    What it is: This attribute shows the approximate external volume of the air purifier in cubic centimetres.
    When it matters: It matters when comparing how much physical space different air purifiers occupy.

    Importance: LOW

    Bosch Air 4000 has a larger overall volume than the average air purifier (42340.5 cm³ vs 31257.025 cm³).42340.5 cm³ vs 31257.025 cm³
Total
Overall
Performance
Features
Design

Graphic comparison of Bosch Air 4000 and other products in the Air Purifiers category

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Third-party reviews

United Kingdom
amazon
4.6
705 Reviews
amazon
4.4
88 Reviews
United States
Amazon_logo.png
4.4
45 Reviews

(Reviews last updated: August 2026)

What customers 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 customers dislike 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

Expert reviews

C
consumerreports.org
N/A
Summary of the review
Bosch Air 4000 Air Purifier Review - Consumer Reports

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