Coway Air Purifiers UK: Airmega Mighty & Airmega 150 (2026)
Updated: October 2026 · Coway UK range · Prices checked 18 Oct 2026
Coway UK range — price, CADR and 3-year cost
Mighty CADR figures are AHAM-verified (the gold standard). Airmega 150 CADR is manufacturer-stated. 3-year total at Ofgem 24.5p/kWh, 12 h/day. Room coverage at 3 ACH (2.4 m ceiling).
| Model | Certification | Unit price | CADR | Covers (3 ACH) | Sleep noise | 3-yr TCO | Buy |
|---|---|---|---|---|---|---|---|
| Coway Airmega Mighty (AP-1512HH) | Allergy UK Seal | £219.99 | 418 m³/h (AHAM) | 27 m² | 24 dB | £404.34 | Buy → |
| Coway Airmega 150 | ECARF | £149.99 | 277 m³/h (mfr) | 18 m² | 20 dB | £287.15 | Buy → |
3-year TCO: unit price + 3 yr electricity at 12 h/day at 24.5p/kWh (Q1 2026) + 3 yr filter cost.
Allergy UK Seal vs ECARF — what each certification means
Both certifications are independent third-party endorsements. Neither is trivially earned — each requires testing and formal review. But they test different things and are awarded by different organisations.
Awarded by Allergy UK, the leading UK allergy charity. Products undergo independent evaluation; the seal confirms the product has been assessed as suitable for allergy sufferers. The Airmega Mighty's AHAM-verified CADR data (246 CFM for dust) supported the application. Recognised by UK allergists and GPs as a meaningful indicator.
European Centre for Allergy Research Foundation — a German-founded non-profit, now pan-European. Tests products for suitability for allergy and asthma sufferers. Recognised across the EU and UK. The Airmega 150's ECARF certification was awarded based on allergen capture testing; the seal is valid across all EU-conformant products including UK market versions.
Neither certification is "better" — they test to different protocols and represent independent validation of different scopes. If you are in the UK and specifically want a certification your GP or Allergy UK consultant would recognise, the Allergy UK Seal on the Mighty has more direct UK provenance. If ECARF is specifically referenced by your health provider (common in EU-country expatriates and Irish buyers), the Airmega 150 covers you.
Coway Airmega Mighty (AP-1512HH) — UK data
The Mighty is the only purifier in the Phase-1 dataset with AHAM-verified CADR figures. AHAM (Association of Home Appliance Manufacturers) is the US accreditation body for CADR testing; results appear on the AHAM Verifide registry. The Mighty's dust CADR of 246 CFM converts to 418 m³/h — placing it among the strongest performers for rooms up to 27 m² at 3 ACH.
- CADR (dust, AHAM-verified): 246 CFM = 418 m³/h
- Room coverage at 3 ACH: 27 m²
- Sleep mode noise: 24 dB — comparable to a quiet whisper
- Filter: Coway AP-1512HH Filter — £39.99 every 12 months (£39.99/yr)
- Certification: Allergy UK Seal of Approval
- HEPA note: True HEPA (AHAM-tested); not formally EN 1822 rated
- 3-year total cost: £404.34 (unit + electricity + filters)
- Annual running cost split: 65% filters, 35% electricity
Coway Airmega 150 — UK data
The Airmega 150 is the quieter, smaller, and cheaper Coway option. At 20 dB in sleep mode, it is one of the quietest air purifiers in the UK market — the Coway website cites this as the quietest mode. ECARF certified. CADR is manufacturer-stated at 163 CFM (277 m³/h) — not AHAM-verified, but Coway's internal testing protocols are considered credible.
- CADR (manufacturer): 163 CFM = 277 m³/h
- Room coverage at 3 ACH: 18 m²
- Sleep mode noise: 20 dB — exceptionally quiet
- Filter: Coway Airmega 150 Filter — £34.99 every 12 months (£34.99/yr)
- Certification: ECARF Quality Seal
- HEPA note: True HEPA; ECARF certified — not EN 1822 formally graded
- 3-year total cost: £287.15 (unit + electricity + filters)
- Annual running cost split: 77% filters, 23% electricity
Which Coway model to pick
- Room up to 18 m², certified reassurance needed, noise is critical: Airmega 150. ECARF certified, 20 dB sleep mode, £287.15 over three years. The quieter and cheaper long-term option for smaller rooms.
- Room up to 27 m², AHAM-verified CADR needed, Allergy UK Seal preferred: Airmega Mighty. The strongest CADR data in this price band, Allergy UK endorsed, suitable for UK bedrooms and living rooms up to 27 m².
- Over 27 m²: Neither Coway model covers this space at 3 ACH. The Philips 2200 AC2220 (58 m², H13 claimed) or Blueair 211i Max (97 m²) are the alternatives to consider.
Coway in our best-picks guides
- Full Coway Airmega Mighty review — detailed testing notes, Allergy UK Seal explanation, AHAM data analysis
- Full Coway Airmega 150 review — ECARF certification, quiet mode testing, bedroom pick
- Best air purifier for allergies UK — Coway Mighty is a core recommendation
- Best air purifier for bedroom UK — Airmega 150 noise profile noted
- Quietest air purifier UK — 20 dB Airmega 150 is among the quietest in the dataset
- Best air purifier for smoke UK — Mighty's 246 CFM AHAM smoke CADR
- HEPA filter grades explained — understanding True HEPA vs EN 1822, and what Coway's certifications mean
Prices checked 18 October 2026. CADR converted from CFM at ×1.699 where applicable. 3-year TCO at Ofgem 24.5p/kWh (Q1 2026), 12 h/day. This page contains Amazon UK affiliate links. Affiliate disclosure.