Coway Airmega 150 UK Review (2026): ECARF Certified, 20 dB Sleep Mode
Updated: October 2026 · 4 models compared · Prices checked 18 Oct 2026
Three-Way Comparison: Airmega 150 vs Coway Mighty vs Core 300S
The key buying question for the 150 is how it sits against the Mighty (bigger, Allergy UK Seal, more room coverage) and the Core 300S (cheaper, no certification). The table answers this with actual numbers.
| Model | Unit price | 3-yr total | Sleep dB | Certification | Covers (3 ACH) |
|---|---|---|---|---|---|
| Coway Airmega 150 (this model) | £149.99 | £287.15 | 20 dB | ECARF (UK listing) | 18 m² |
| Coway Airmega Mighty | £219.99 | £404.34 | 24 dB | Allergy UK Seal | 27 m² |
| Levoit Core 300S | £84.99 | £230.70 | 24 dB | None | 12 m² |
3-year total = unit price + (annual running cost × 3) at 12 hours/day, Ofgem Q1 2026 rate 24.5p/kWh. Running cost data from PurifierBeast UK running-cost model.
How to read this table:
- ECARF vs Allergy UK — neither is "better": ECARF (European Centre for Allergy Research Foundation) and the Allergy UK Seal are different certifications from different organisations. ECARF focuses on European laboratory standards for allergen filtration; Allergy UK tests at real-world fan speeds including reduced settings. Both are independently verified. They test different things. The Airmega 150 holds ECARF on the UK listing; the Mighty holds the Allergy UK Seal.
- Room coverage gap: The Mighty covers 27 m² vs the 150's 18 m² at 3 ACH. For rooms over 18 m², the Mighty's higher CADR is the relevant differentiator.
- Sleep noise: 20 dB on the 150 vs 24 dB on the Mighty — a meaningful gap at bedroom distances. Both are inaudible to most sleepers above ambient room noise, but 20 dB is the lower figure.
ECARF Explained
ECARF Certification: What It Is and What It Covers
What ECARF tests
ECARF (European Centre for Allergy Research Foundation) is a German-based certification body. Its Quality Seal for air purifiers requires testing under standardised European laboratory conditions, assessing allergen removal efficiency for common aeroallergens including house dust mite particles, pollen, and pet dander. The criteria are considered among the most demanding allergen-filtration standards in Europe.
Status on the Airmega 150 UK listing
ECARF certification is confirmed on the Coway Airmega 150 UK listing. This is the specific model reviewed here. The Coway Airmega Mighty (AP-1512HH) does not show ECARF on the UK product listing — only the Allergy UK Seal is confirmed for that model.
ECARF on Airmega 150 UK listing: Confirmed ✓
ECARF vs Allergy UK Seal — different certifications from different organisations
The Allergy UK Seal (held by the Mighty) tests at real-world fan speeds — not just maximum speed — which is its specific strength: evidence that performance holds at the lower settings most people use day-to-day. ECARF focuses on European laboratory allergen-filtration standards. Neither is universally "better"; they test different things. Buyers requiring a specific certification for medical, professional, or documented-compliance reasons should check which certification applies to their requirement.
True HEPA and ECARF together
The Airmega 150 uses True HEPA filtration (99.97% at 0.3 µm, AHAM-verified). ECARF adds an independent layer confirming allergen removal in standardised European testing conditions. The combination — True HEPA filtration with ECARF certification — is the Airmega 150's primary differentiator versus uncertified True HEPA models such as the Core 300S.
Filter spec: True HEPA; ECARF certified
Sleep Mode and Noise
The Airmega 150 runs at 20 dB in sleep mode — the lowest figure in this three-way comparison. For reference:
- 20 dB is approximately the ambient noise level of a very quiet room. It is below most people's threshold for perceptible sound in a bedroom with a closed door.
- The Coway Mighty sleep mode: 24 dB — also very quiet, but measurably higher on the logarithmic dB scale.
- The Core 300S sleep mode: 24 dB.
- The Airmega 150 maximum: 52 dB. This is higher than its sleep mode but comparable to the Mighty's 53 dB max.
For bedroom use where the purifier runs overnight at sleep speed, the 20 dB figure is the relevant spec. The 4 dB gap between the 150 and the Mighty (20 vs 24 dB) is a real acoustic difference at bedroom distances for light sleepers, though both are considered very quiet in the category.
For bedroom placement guidance see our best bedroom air purifier guide. The 150 also appears in our mould and damp guide for ECARF-certified allergen control in damp-prone rooms.
UK Specs at a Glance
CADR (all particles)
277 m³/h
Converted from AHAM CFM 163 × 1.699
Room Coverage
18 m² at 3 ACH
Noise
20 dB sleep / 52 dB max
Power
10W typical
Filter
£34.99 / 12 months
True HEPA; ECARF certified
Certifications
ECARF (UK listing confirmed)
UK Price
£149.99
Checked 18 Oct 2026. Price fluctuates — check current price before purchasing.
Room Coverage
At 277 m³/h (converted from AHAM CFM 163 × 1.699) the Airmega 150 covers 18 m² at 3 ACH with a 2.4 m ceiling. For UK room context:
- Single bedroom: typically 8–10 m² — the 150 covers this with significant headroom.
- Standard double bedroom (modern build): typically 12–14 m² — the 150 is correctly sized with capacity to spare.
- Large double bedroom / small living room: 16–18 m² — the 150 covers this at the upper end of its range.
- Over 18 m²: step up to the Coway Mighty (27 m² at 3 ACH) or Levoit Core 400S (25 m²).
Use the room size calculator to check your specific room dimensions.
Running Costs
Running costs at 12 hours/day, Ofgem Q1 2026 rate (24.5p/kWh):
- Electricity: £10.73/year (10W typical × 12h × 365 days at 24.5p)
- Filter replacement: £34.99/year (annual replacement at £34.99)
- Annual running cost: £45.72/year
- 3-year total (including unit): £287.15
The 12-month filter interval is a practical advantage over 6-month models (Core 300S, Core 400S, Blueair 3250i) — one filter purchase per year instead of two. At £34.99 the replacement filter is also the cheapest annual filter cost in this comparison. For a full cost breakdown see our air purifier running cost guide.
Verdict: Who Should Buy the Airmega 150
Buy the Airmega 150 if: your room is 12–18 m², you need independently certified allergen filtration (ECARF), you want the quietest sleep mode in the comparison at 20 dB, and you want the lowest three-year total cost of the certified options (£287.15 vs the Mighty's £404.34). It is the best-value certified-HEPA bedroom purifier in this comparison for rooms under 18 m².
Buy the Coway Mighty instead if: your room is over 18 m², or you specifically need the Allergy UK Seal (which tests at real-world fan speeds — a different but complementary certification). See the Coway Mighty review for a full Allergy UK Seal explainer.
Buy the Core 300S instead if: budget is the primary factor and certification is not a requirement. The 300S costs £56 less at purchase and £230.70 over three years vs £287.15. See the Core 300S review.