Coway Mighty vs Levoit Core 400S UK: Which Wins at £200?
Updated: October 2026 · Mid-range comparison · Prices checked 18 Oct 2026
The Question
The Coway Airmega Mighty (£219.99) and the Levoit Core 400S (£174.99) are the two most-recommended purifiers in the UK £150–£230 bracket. They cover similar room sizes — the Mighty at 27 m² (408 m³/h CADR, converted from AHAM 240 CFM × 1.699) and the 400S at 25 m² (374 m³/h, converted from AHAM 220 CFM × 1.699) at 3 ACH. They both run at 24 dB in sleep mode. The differences come down to certification, filter cost, and running cost.
See the full Coway Airmega Mighty review and the Levoit Core 400S review for complete specs and independent assessments.
3-Year TCO Head-to-Head
| Metric | Coway Airmega Mighty | Levoit Core 400S |
|---|---|---|
| UK street price | £219.99 | £174.99 |
| Electricity/yr (12h/day, 24.5p/kWh) | £21.46 | £12.88 |
| Filter/yr | £39.99 | £49.98 |
| Annual running cost | £61.45 | £62.86 |
| 3-year total (TCO) | £404.34 | £363.57 ▲ saves £40.77 |
| CADR | 408 m³/h | 374 m³/h |
| Room coverage (3 ACH) | 27 m² | 25 m² |
| Noise (sleep mode) | 24 dB | 24 dB |
| Power draw (watts) | ~48W | 12W |
3-yr TCO = unit price + (annual running cost × 3). Electricity at Ofgem Q1 2026 rate of 24.5p/kWh. Filter costs based on UK replacement prices at time of writing.
TCO verdict: On 3-year total cost of ownership, the Core 400S costs £40.77 less than the Coway Mighty (£363.57 vs £404.34). This is driven almost entirely by the Mighty's higher electricity draw (~48W vs 12W for the 400S), which adds roughly £8.58/year in electricity costs. The 400S's higher filter cost (£49.98/yr vs £39.99/yr for the Mighty) partially offsets this — but the electricity gap wins out over three years.
What Coway Wins
The Coway Airmega Mighty carries the Allergy UK Seal of Approval — an independent UK certification confirming the unit is suitable for allergy and asthma sufferers. For households with diagnosed allergies or asthma, this certification carries real weight and is something the Levoit Core 400S does not have.
The Mighty also has a 12-month filter interval vs the 400S's 6-month interval. While the Mighty's annual filter cost is slightly lower at £39.99/yr vs £49.98/yr, the main practical advantage is convenience: one filter change per year rather than two. If filter maintenance is something you are likely to forget or delay, the Mighty's annual cycle is meaningfully simpler.
The Coway also slightly edges the 400S on CADR (408 m³/h vs 374 m³/h) and covers 27 m² vs 25 m² at 3 ACH — a marginal difference for most rooms but worth noting for larger spaces. Read more on the best air purifiers for allergies UK.
What Levoit Wins
The Core 400S wins on running cost and smart features. At 12W vs roughly 48W for the Mighty, the 400S uses approximately 75% less electricity at max fan speed. Over three years at 12 hours/day, that produces a meaningful gap in electricity cost.
The 400S also integrates with the Levoit VeSync app for scheduling, air quality monitoring, and remote control. The Coway Mighty does not have Wi-Fi or app connectivity — you operate it manually. For households that want to automate schedules or check filter life remotely, the 400S's smart ecosystem is a genuine advantage.
The 400S is also £45 cheaper at point of purchase (£174.99 vs £219.99), which matters if budget is a constraint. See the best air purifiers for smoke UK for context on how these models compare in smoke removal scenarios.
Filter Comparison
| Filter detail | Levoit Core 400S | Coway Airmega Mighty |
|---|---|---|
| Filter price (per unit) | £24.99 | £39.99 |
| Replacement interval | 6 months | 12 months |
| Annual filter cost | £49.98 | £39.99 |
| Filter changes per year | 2 | 1 |
| Where to buy (UK) | Amazon UK, Levoit UK | Coway UK, Amazon UK |
The Coway's 12-month interval is lower hassle, but the annual cost is £10 cheaper. If you are price-sensitive on ongoing filter cost, the Mighty narrowly wins; if you prefer fewer disruptions, the Mighty also wins. The 400S costs £10 more per year in filters but has the benefit of app reminders that tell you exactly when to change.
Verdict
The Levoit Core 400S wins this comparison on 3-year TCO by £40.77, and it wins on smart features and electricity efficiency. The Coway Airmega Mighty wins on Allergy UK certification and annual filter convenience. Neither model is the wrong choice — the decision is yours based on which advantages you actually need.
If you have clinically diagnosed allergies or asthma and want certification you can point to, spend the extra £40.77 over three years for the Mighty. If you want the lowest long-term cost and app control, the Core 400S is the better buy.
Coway Airmega Mighty
Wins on: Allergy UK certification, filter convenience
Check UK Price — Coway MightyRelated: Best air purifiers for smoke UK — Best for allergies UK