Winix Air Purifier for Home Bedroom
Best for everyday dust and pollen in a single room.
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.
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At a glance
| Bosch Air 4000 Purifier | Bosch Air Smart Purifier | |
|---|---|---|
| Our score | 8.8/10 | 7.1/10 |
| Best for | large living rooms and open-plan spaces, and light sleepers, as it runs from 25 dB | living rooms and large bedrooms, and light sleepers, as it runs from 25 dB |
| Not ideal for | buyers who want app or voice control | buyers who want the lowest running cost, as smart models usually cost more to buy |
| Brand | Bosch | Bosch |
Specifications compared
| Bosch Air 4000 Purifier | Bosch Air Smart Purifier | |
|---|---|---|
| Room size | Up to 62.5 m² | Up to 37.5 m² |
| CADR | 300 m³/h | 180 m³/h |
| Filter | HEPA + activated carbon | HEPA + activated carbon |
| Filter stages | 3 | 3 |
| Quietest setting | 25 dB | 25 dB |
| App control | Not listed | Yes |
| Auto mode | Yes (air quality sensor) | Yes (air quality sensor) |
| Weight | 5.8kg | 2.3kg |
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 Bosch (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 2000i 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
The Bosch is rated for rooms up to 62.5 m², so it suits a large living room or open-plan space. Its clean air delivery rate (CADR) is 300 m³/h, so in a 62.5 m² room with 2.4 m ceilings it can filter the whole volume of air about 2.0 times an hour.
Bosch Air Smart Purifier
The Bosch is rated for rooms up to 37.5 m², so it suits a typical living room or a large bedroom. Its clean air delivery rate (CADR) is 180 m³/h, so in a 37.5 m² room with 2.4 m ceilings it can filter the whole volume of air about 2.0 times an hour.
HEPA Filtration Performance
Bosch Air 4000 Purifier
The Bosch uses a HEPA filter, so it traps pollen, dust and pet dander, and an activated carbon layer helps with cooking smells and odours.
Bosch Air Smart Purifier
The Bosch uses a HEPA filter, so it traps pollen, dust and pet dander, and an activated carbon layer helps with cooking smells and odours.
Noise Level and Sleep Mode
Bosch Air 4000 Purifier
The Bosch runs from 25 dB on its lowest setting, so it is quiet enough to leave on overnight in a bedroom.
Bosch Air Smart Purifier
The Bosch runs from 25 dB on its lowest setting, so it is quiet enough to leave on overnight in a bedroom.
Smart Features and App Control
Bosch Air 4000 Purifier
An air quality sensor drives its automatic mode, so the fan speeds up when it detects dust or smoke and slows down when the air is clean.
Bosch Air Smart Purifier
The Bosch can be controlled from a phone app, so you can check air quality and change settings when you are away from it. An air quality sensor drives its automatic mode, so the fan speeds up when it detects dust or smoke and slows down when the air is clean.
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 this air purifier 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 Bosch and Bosch Air 2000i 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 Air 2000i'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. This air purifier 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 Bosch 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 Bosch 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 premium air purifier for rooms up to 62.5 m², with a CADR of 300 m³/h and a HEPA filter. The Bosch Air Smart Purifier is still worth it if it is cheaper when you check, or if it better matches your specific needs.
Neither quite right? Also worth considering
Levoit Air Purifiers for Home Bedroom With HEPA & Carbon
Best for large living rooms and open-plan spaces, and light sleepers, as it runs from 24 dB.