Guide · Checked 18 October 2026
Levoit Core 300S vs 400S: which Levoit air purifier should you buy?
Match the purifier to the room size. A bigger model on a low setting is quieter than a small one flat out.
Levoit Core 300S vs 400S comes down to room size. The Core 300S suits a bedroom or a small living room, and the Core 400S suits a large living room or an open-plan space: Levoit rates the 400S at 433 cubic metres of clean air an hour against 258 for the 300S. Both have an air quality sensor, an auto mode and app control. The Core Mini and 200S are for small bedrooms, and the 600S is for very large rooms. Here is the full Levoit Core range from its Amazon UK listings on 18 October 2026.
We have not tested these products. This guide is based on the manufacturers' Amazon UK listings and buyer demand, checked on 18 October 2026. We do not show prices because they change constantly. As an Amazon Associate I earn from qualifying purchases. How we choose.
Levoit Core 300S vs 400S: the differences
- Power. Levoit quotes a clean air delivery rate (CADR) of 258m³ an hour for the Core 300S and 433m³ for the Core 400S. Higher CADR means the air in a room is cleaned more often.
- Room size. Levoit rates the 300S for rooms up to 108m² (once an hour, or 54m² twice an hour) and the 400S for up to 180m². For allergies, aim for the air to be cleaned several times an hour, so a smaller room than the maximum.
- Both have a 3-stage HEPA filter, a PM2.5 air quality sensor, an auto mode that changes the fan speed, a quiet sleep mode and the VeSync app.
- Filters. The 300S takes four filter types: Original, Pet Allergy, Toxin Absorber and Mould. Check which filters are sold for the 400S on its listing.
How to choose the right size
- Measure the room: length times width in metres gives the floor area. A 4m by 3.5m bedroom is 14m².
- For hay fever or allergies, choose a purifier rated for at least twice your room size, so it cleans the air several times an hour on a quiet setting.
- Running a larger purifier on a low speed is quieter than running a small one on high.
Levoit Core air purifiers compared
| Model | Clean air delivery rate | Room size (Levoit's rating) | Smart app and sensor |
|---|---|---|---|
| Levoit Core Mini | Not stated in title | Up to 34m² | No |
| Levoit Core 200S | Not stated in title | Up to 64m² | App and voice control |
| Levoit Core 300 | 187m³/h | Up to 80m² | No |
| Levoit Core 300S | 258m³/h | Up to 108m² | Yes, PM2.5 sensor |
| Levoit Core 400S | 433m³/h | Up to 180m² | Yes, PM2.5 sensor |
| Levoit Core 600S | 697m³/h | Up to 294m² | Yes |
Figures are Levoit's own, from the Amazon UK listings on 18 October 2026. Levoit's room sizes assume the air is cleaned about once an hour.
Which Levoit air purifier to buy
Best for bedrooms and small living rooms
Levoit Core 300S
CADR 258m³ an hour, a PM2.5 laser sensor with auto mode, app control and four filter options. It was one of the best-selling air purifiers on Amazon UK when we checked.
Read our full guide to the Levoit Core 300S →
Paid link · opens Amazon.co.uk
Best for large rooms
Levoit Core 400S
CADR 433m³ an hour. Levoit says it cleans a 36m² room in 12 minutes and 90m² in 30 minutes. 3-stage HEPA filter, PM2.5 sensor with auto mode and a 24dB sleep mode with the lights off.
Paid link · opens Amazon.co.uk
Best for open-plan homes
Levoit Core 600S
Levoit's biggest Core purifier: CADR 697m³ an hour for rooms up to 294m². Only worth it for a large open-plan space; for a normal living room the 400S is enough.
Paid link · opens Amazon.co.uk
Best non-smart option
Levoit Core 300
The same four filter options as the 300S with a 3-stage HEPA filter, a timer and four fan speeds, but no app or air quality sensor, and a lower CADR of 187m³ an hour.
Paid link · opens Amazon.co.uk
Best for a small bedroom
Levoit Core 200S
Rated for rooms up to 64m², with app and voice control (Alexa and Google Assistant), a 24dB sleep mode, a night light and 2, 4 and 8 hour timers.
Paid link · opens Amazon.co.uk
Cheapest Levoit
Levoit Core Mini
A small purifier rated for rooms up to 34m² with a 3-layer HEPA filter. The best-selling purifier in Levoit's range on Amazon UK when we checked, at over five thousand a month. Good for a desk or bedside.
Paid link · opens Amazon.co.uk
Filters
- Genuine Core 300 and 300S replacement filter
- Levoit Core 300S Toxin Absorber filter (smoke and odours)
- Levoit Core 400S replacement filter
Filters are model-specific. Levoit recommends replacing them every 6 to 8 months, or sooner with pets or smoke. Paid links to Amazon.co.uk.
Air purifier for smokers
A HEPA filter traps smoke particles, but the smell comes from gases that HEPA does not catch. For tobacco smoke, look for a filter with a lot of activated carbon, such as Levoit's Toxin Absorber filter for the Core 300 and 300S.
Choose a purifier rated for well above the room size and run it on a higher speed while smoking and for a while afterwards. Filters fill faster with smoke, so budget for replacements.
No air purifier makes second-hand smoke safe. Opening a window or smoking outside does more.
For pets, allergies and mould
Pets: the Pet Allergy filter is aimed at dander and fur. Run the purifier in the room where the pet sleeps.
Hay fever: keep windows closed on high-pollen days and run the purifier in the bedroom overnight on sleep mode.
Mould: a purifier catches spores in the air but does not fix damp. Pair it with a dehumidifier in a damp room.
Questions people ask
Levoit Core 300S vs 400S: which is better?
The 400S is more powerful, with a CADR of 433m³ an hour against 258 for the 300S, so it suits larger rooms. For a bedroom or small living room, the 300S is enough and costs less.
What size room is the Levoit Core 300S for?
Levoit rates it for rooms up to 108m² once an hour, or 54m² twice an hour. For allergies, it works best in rooms up to about 25 to 30m².
Is the Levoit Core 400S worth it?
If your living room is large or open-plan, yes. It cleans the air faster, so it can run on a quieter setting and still keep up.
What is the best air purifier for smokers?
One with a large activated carbon filter for the smell as well as HEPA for the particles, sized well above your room. For the Core 300 and 300S, Levoit's Toxin Absorber filter is the one aimed at smoke.
Are Levoit air purifiers good?
Levoit is one of the best-selling air purifier brands on Amazon UK, with tens of thousands of buyer ratings across the Core range. Choose the model by room size.
How often should you change a Levoit filter?
Levoit suggests every 6 to 8 months with normal use. Pets, smoke or running it all day mean replacing it sooner.
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