# Bosch Air 4000 Air Purifier, CADR 300 m3/h, 3-in-1 Filter, 62.5 m2

Source: https://www.ranked10.co.uk/home/best-air-purifier/bosch-air-4000-air-purifier
Ranked #3 in "Best Air Purifier 2026: 10 Ranked on Real Air Changes": https://www.ranked10.co.uk/home/best-air-purifier

- Price: £189.99 (checked on Amazon UK on 2026-09-10)
- Amazon rating: 4.6 from 711 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0B5D7H7VP?tag=ranked10-21

The Air 4000 is the appliance-brand option here, and the listing is precise about filtration: a HEPA filter with a pre-filter and an activated carbon layer, quoted at a CADR of 300 cubic metres per hour for rooms up to 62.5 square metres, with a 25 decibel noise figure, 178 watts of draw and touch and app control, in a 5.8 kilogram white body.

That 178 watt figure is the standout number, and not in a good way: it is the highest power draw in this ranking by a wide margin, which matters if the purifier runs all day. A sleep mode and a smart sensor are named. At the time of collection it carried 711 ratings at 4.6 stars. Everything here comes from the Amazon listing rather than our own testing.

## Specification

| Field | Value |
|---|---|
| Power Source | Electric |
| Control Method | App |
| Filter Type | HEPA filter with pre-filter and activated carbon filter |
| Floor Area | 62 Square Meters |
| Noise Level | 25 Decibels |
| Particle Retention Size | 2.5 Micron |
| Controller Type | Touch control |
| Wattage | 178 watts |
| Contaminant Filtration Capability | dust, pollen, viruses |
| Special Features | HEPA filter, smart sensor, sleep mode |
| Filter Class | HEPA |
| Item Dimensions D x W x H | 29.1D x 29.1W x 50H centimetres |
| Item Weight | 5.8 kg |
| Colour | White |
| Brand Name | Bosch Thermotechnik |
| Model Number | 7733701943. |
| Number of Packs | 1 |
| Item Highlight | With 3-in-1 Air Filter, Smart Sensor, Auto Mode, Quiet Mode (< 25 dB(A)), CADR: 300 m³/h |
| Unit Count | 1.0 count |
| Manufacturer | Bosch Thermotechnik GmbH |

## Questions people ask

**What CADR is listed?**

300 cubic metres per hour.

**What filter does it use?**

A 3-in-1 HEPA filter with pre-filter and activated carbon.

**What room size is listed?**

Up to 62.5 square metres.

**What is the listed power draw?**

178 watts, the highest in this ranking.

**How many ratings does it have?**

711 at the time of collection, averaging 4.6 stars.