Levoit Core 300S vs Core 400S UK: Is the £90 Upgrade Worth It?

Updated: October 2026 · Core range comparison · Prices checked 18 Oct 2026

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Short answer: For rooms under 12 m², the Core 300S at £84.99 wins outright. For rooms over 20 m², the Core 400S at £174.99 is actually cheaper per m² covered over three years. The break-even is around 12–20 m² — at that size the 300S can stretch, but the 400S is better matched. The break-even table below makes the maths concrete.

The Question Answered Up Front

The Core 300S and Core 400S share the same Levoit filter ecosystem and nearly identical features (Wi-Fi, app, sleep mode at 24 dB). The only meaningful differences are CADR and room coverage: the 300S delivers 246 m³/h (converted from AHAM 145 CFM × 1.699) and covers 12 m² at 3 ACH; the 400S delivers 374 m³/h (converted from AHAM 220 CFM × 1.699) and covers 25 m² at 3 ACH. The £90 price gap and the higher filter cost of the 400S mean the real question is whether you actually need to clean more than 12 m².

See the full Levoit Core 300S review and the Levoit Core 400S review for complete specs and UK pricing detail.

Break-Even Table: 3-Year Cost Per m² Covered

This table uses pre-calculated 3-year totals at 12 hours/day and the Ofgem Q1 2026 rate of 24.5p/kWh. The Core 200S is included for context — it is the entry point below the 300S.

Model	3-yr TCO	Covers (3 ACH)	3-yr cost per m² covered	Best for
Levoit Core 200S	£179.25	8 m²	£22.41/m²	Rooms under 8 m²
Levoit Core 300S	£230.70	12 m²	£19.23/m²	Rooms under 12 m²
Levoit Core 400S	£363.57	25 m²	£14.54/m²	Rooms over 20 m²

3-yr TCO = unit price + (annual running cost × 3). Electricity at 24.5p/kWh. Filter cost based on Levoit UK 6-month replacement cycle.

The conclusion from this table:

Rooms under 12 m²: the Core 300S wins on every metric. It costs £19.23 per m² covered over three years vs £14.54 for the 400S, but you are not buying 25 m² of coverage — you only need 12 m², and the 300S delivers that at lower total cost.
Rooms 12–20 m²: the 300S may stretch (at reduced ACH) but the 400S is better matched. The extra £133 in three-year cost buys you the headroom to run at 3 ACH across the full room.
Rooms over 20 m²: the 400S is the more economical choice per m² covered. At £14.54/m², it beats the 300S (£19.23/m²) and the 200S (£22.41/m²).

Filter Ecosystem: Same Parts, Different Price

Both models use Levoit's proprietary H13 HEPA + activated-carbon combination filter. The 300S filter (H13, replacement approximately every 6 months) costs around £19.99 per unit — two per year at £39.98/yr. The 400S filter is slightly larger and costs around £24.99 per unit — two per year at £49.98/yr. Both filters are available directly from Levoit UK and Amazon UK.

Neither model uses a pre-filter you can wash separately. Both have a basic fabric pre-filter layer built into the main filter unit. The 6-month replacement interval applies to both at typical 12-hour-per-day use. If you run either model in a heavy-pollution environment (pets, smokers, urban road-facing flat), Levoit recommends inspecting at 4 months.

There is no meaningful filter ecosystem advantage between the two models — the Levoit VeSync app monitors filter life for both identically.

When to Pick Each Model

Choose the Core 300S if…

Your room is 12 m² or smaller
Budget is a genuine constraint — £84.99 vs £174.99
You want the lowest 3-year total (£230.70)
You are buying a second unit for a spare room
You want proven bedroom use at 24 dB sleep mode

Check UK Price — Core 300S

Choose the Core 400S if…

Your room is 15 m² or larger
You want the best cost-per-m² over three years (£14.54/m²)
You plan to move the unit between a larger living room and bedroom
You want future-proofing for a first flat with an open-plan living area
You are treating smoke or pet dander in a mid-size room

Check UK Price — Core 400S

Verdict

The Core 300S is not a budget compromise — it is the right tool for rooms up to 12 m². Its 3-year total of £230.70 is £133 less than the 400S, and it covers a standard UK double bedroom at full 3 ACH. If your room is larger than 15 m², or if you want a single unit that can handle a semi-open lounge, the 400S earns its price through a lower cost per m² covered and a significantly higher 374 m³/h CADR. The two models are not rivals — they are different-sized tools for different rooms.