Bosch Air 4000 Purifier vs Bosch Air Smart Purifier
We compare the Bosch Air 4000 Purifier and the Bosch Air Smart Purifier across every dimension that matters - our scores, the key specs, and how each performs on the things you will actually notice day to day.
At a glance
| Bosch Air 4000 Purifier | Bosch Air Smart Purifier | |
|---|---|---|
| Our score | 8.8/10 | 7.1/10 |
| Best for | Everyday home use with allergy, dust and odour concerns | Everyday home use with allergy, dust and odour concerns |
| Not ideal for | Buyers wanting smart-home, app or voice control | Buyers on the tightest budget |
| Brand | Bosch | Bosch |
Design and Build Quality
Bosch Air 4000 Purifier
With its clean, white casing and a compact footprint of 29.1 cm by 29.1 cm by 50 cm (29.1D x 29.1W x 50Hcm), this air purifier (Air 4000) is designed to suit common rooms without drawing attention. Weighing 5.8 kg, it feels solid for its size. The front panel is built for simple handling, and controls include an app option. The 3-in-1 filter stack is housed neatly. Overall, the Bosch prioritises practical, clean-room styling over complex design.
Bosch Air Smart Purifier
Sleek and compact, the air purifier (7733703375) is designed to fit easily on shelves or floors. It measures 23.5 D x 23.5 W x 38.8 H cm, weighs 2.25 kg, and has a white finish for everyday home spaces. The Bosch Air Purifier UK features a minimal, tidy casing and an LED segment display for quick status checks. The build is practical, with a stable footprint and easy handling due to its light mass.
CADR and Room Coverage
Bosch Air 4000 Purifier
CADR, which stands for Clean Air Delivery Rate, is rated at 300 m³/h for the air purifier (Air 4000), indicating a fairly high air-moving and cleaning capability for a compact unit. The manufacturer states purification in rooms up to 62.5 m², which suits typical living rooms, bedrooms, kitchens, and offices. In automatic mode, the purifier adjusts performance based on air quality and room size, allowing it to increase output when conditions worsen. Actual results still depend on room layout, whether doors are kept open, and how consistently the air purifier runs.
Bosch Air Smart Purifier
With a Clean Air Delivery Rate (CADR) of 180 m³/h, the air purifier (7733703375) is designed to move a meaningful amount of air through its filtration system, which is why it is marketed for rooms up to 37.5 m². This CADR indicates it can refresh air more quickly in smaller spaces, with real-world performance depending on room height, layout and the level of airborne pollution. During Auto Mode, the guidance for the Bosch Air 2000i and The Bosch claims it adjusts continuously for air quality and room size. For larger rooms, faster fan use may be needed.
HEPA Filtration Performance
Bosch Air 4000 Purifier
HEPA filtration performance is a key part of how the Bosch handles airborne particles, focusing on more than just circulating air. In the Bosch Air 4000 air purifier, a HEPA filter stage works with a pre-filter and an activated carbon filter as part of a 3-in-1 setup. The HEPA stage targets fine and ultra-fine particles such as pollen, dust and dander, and it is described as capturing particles down to 2.5 microns.
Bosch Air Smart Purifier
The air purifier uses a 3-in-1 filter that combines a pre-filter, a HEPA filter layer and an activated carbon filter, targeting different contaminants as air passes through. The pre-filter captures larger debris such as dust and pet hair first, while the HEPA filter layer focuses on smaller particles including pollen and viruses. The activated carbon stage adsorbs odours as they pass through, supporting everyday home filtration depending on what pollutants are present and circulating in the room.
Noise Level and Sleep Mode
Bosch Air 4000 Purifier
Quiet Night mode is designed to keep the Bosch Air 4000 quieter during sleep, and it can reduce the noise level to under 25 dB(A). This matters because background sound stays low, and the unit also switches off its light to limit distractions. The main limitation is that Quiet Mode reduces airflow performance compared with normal operation, so cleaning may be slower. Still, for bedtime use, the quieter night setting is straightforward and effective.
Bosch Air Smart Purifier
Noise level and sleep comfort are important for any air purifier. The Bosch includes a Quiet Mode that reduces sound to < 25 dB(A) and switches off the light. For the bosch 7733703375, this is relevant because bedrooms typically require low, steady noise and the light can disrupt sleep. In day use, the unit can run in other modes, although the quiet-night setting is the most suitable option at night. The bosch air 2000i smart air purifier pros and cons note clear support for quieter operation.
Smart Features and App Control
Bosch Air 4000 Purifier
After looking at how Quiet Night helps keep background sound low, it makes sense to examine how the Bosch is controlled during the day and when people are away. The air purifier uses an app for control, and it also supports an automatic mode that adjusts performance based on air quality and room size. For day-to-day use, the owner can switch modes and monitor operation through the app, rather than relying solely on the unit. Smart home compatibility is not supported, so voice assistants and automation routines are not available.
Bosch Air Smart Purifier
Beyond quieter nighttime operation, smart control is a key part of how the air purifier (model 7733703375) can be used day to day. This air purifier supports smartphone control, and settings can be adjusted on the LED segment display. Through the Smarthome Eco system, voice control is supported, allowing changes to be made without reaching the unit. In Auto Mode, the purifier continuously adjusts performance to air quality and room size, while timers help schedule operation. The Bosch smart air purifier Amazon listing highlights this app workflow.
Filter Life and Cost
Bosch Air 4000 Purifier
Filter life and running cost for the Bosch (7733701943) depend on how long the purifier stays on and on the amount of dust and pollen in the home. The manufacturer describes a 3-in-1 filter made from a pre-filter plus a HEPA filter layer and an activated carbon filter. In Bosch 7733701943, the pre-filter traps larger debris first, while the HEPA layer targets particles down to 2.5 microns and the activated carbon stage handles odours from gases. Cleaner room air slows the build-up of filter loading, whereas heavy pollen seasons can reduce usable filter life.
Bosch Air Smart Purifier
Filter life and ongoing cost matter most with the Bosch Air 2000i because it uses a 3-in-1 filter system (pre-filter, HEPA and activated carbon) designed to target dust, pollen, viruses, pet hair and odours. Filter replacement will therefore depend on how quickly those contaminants build up in the home, since particles need to pass through the filtration stages to be captured. The air purifier and This air purifier smart air purifier are described as running best when filter changes are not delayed, because trapped particles can clog the airflow. However, the review could not confirm replacement intervals or filter prices.
Energy Use
Bosch Air 4000 Purifier
Energy use for the air purifier (7733701943) is largely driven by how long it is used each day and the fan setting selected, with the manufacturer listing a power use of 178 watts for the model. If the unit runs for longer periods or at higher performance levels, total electricity use will increase. The appliance includes an automatic mode that adjusts performance based on air quality and room size, which can help avoid unnecessary high output. Because it is controlled via an app, scheduling can reduce runtime for this air purifier.
Bosch Air Smart Purifier
Energy use is the next practical factor to evaluate because the Bosch's cleaning power and fan settings determine how much electricity it draws over time, not just how quickly it clears the air. For the air purifier, the manufacturer highlights Auto Mode, which continuously adjusts performance to the air quality and room size. In day-to-day use, higher fan demand can increase running costs, while Quiet Mode lowers noise to under 25 dB(A), which may reduce power needs. The Bosch smart air purifier price also needs to be considered alongside expected daily use patterns.
Cleaning and Maintenance
Bosch Air 4000 Purifier
Cleaning and maintenance for the Bosch (7733701943) mainly involve checking the air intake area and keeping the 3-in-1 filter system working as designed, which includes a HEPA filter layer, a pre-filter, and an activated carbon filter. The Bosch Air 4000 should be wiped around the intake, and the outer casing kept dust-free so airflow does not slow down. When the filters appear loaded, the pre-filter is typically handled first, then the HEPA and activated carbon media are addressed in sequence.
Bosch Air Smart Purifier
Cleaning and maintenance are straightforward, with the main effort depending on how frequently the purifier runs and how dusty the room is. Basic care starts with checking the pre-filter for dust buildup, then gently cleaning or vacuuming it as needed. The HEPA and activated carbon layers should not be washed, so replacements are required when airflow drops or odours persist. The LED display can help track status, while app monitoring adds reminders. Keeping the unit dry, wiping the casing, and using Auto Mode when conditions change helps reduce neglected maintenance.
Who Is This Air Purifier For?
Bosch Air 4000 Purifier
The air purifier (7733701943) is a good fit for people who want straightforward help with everyday indoor air problems, and it suits households that want to reduce dust, pollen, and dander. It is intended for particles up to 2.5 microns, and it uses a 3-in-1 filter system that includes a pre-filter, a HEPA filter layer, and an activated carbon filter. With CADR 300 m³/h, it is designed for rooms up to 62.5 m², so it works well in bedrooms, living rooms, offices, and kitchens. This air purifier prioritises comfort over smart automation, because it is not smart home compatible.
Bosch Air Smart Purifier
The air purifier suits people who want smart, room-focused air cleaning without complex upkeep, and it pairs well with regular maintenance such as checking the pre-filter and replacing the HEPA and activated carbon layers when performance drops or odours remain. It suits households with allergies or pets, as the 3-in-1 filter targets pollen, dust, pet hair and odours, plus viruses. With a CADR of 180 m³/h, it is suitable for rooms up to 37.5 m². Buyers comparing The Bosch Air 2000i with pricier options may value quieter operation for bedrooms, with quiet mode below 25 dB(A).
Bosch Air 4000 Purifier: pros
- CADR of 300 m³/h
- HEPA filter with pre-filter and activated carbon filter filtration
- Quiet operation (25 dB(A))
- Independently certified (HEPA)
- Modest 178 watts power draw
Cons
- No smart-home, app or voice control
- Filter replacement intervals not stated by the manufacturer
Bosch Air Smart Purifier: pros
- CADR of 180 m³/h
- HEPA filtration
- Quiet operation (25 dB(A))
- Independently certified (AHAM)
Cons
- Filter replacement intervals not stated by the manufacturer
Our verdict
Our pick is the Bosch Air 4000 Purifier (our score 8.8/10) - A capable multi-stage air purifier with a CADR of 300 m³/h, held back mainly by the lack of smart-home features. The Bosch Air Smart Purifier is still worth it if it is cheaper when you check, or if it better matches your specific needs.