Winix Zero-S Air Purifier review
By Tom Calder
A capable, quiet HEPA purifier that steps in cleanly for the discontinued original Zero — strong coverage for bigger rooms, though the front cover is fiddly if you plan to move it between rooms.
- Best for
- Large bedrooms or living rooms up to 100m², and hay fever/allergy sufferers.
- Skip it if
- You need to shift a purifier room to room daily
as of 4 Nov 2026, 19:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.We earn a commission if you buy through the retailer links on this page. It doesn't change our verdict. How we make money →
Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- True HEPA H13 filter traces 99.999% of fine particles down to 0.1 microns
- Manufacturer-rated 27dB sleep mode with dimmed lights
- Auto mode plus a large 100m² coverage suits open-plan living spaces
Worth knowing
- Front cover comes off easily when carrying it, so it's best left in one spot
- Replacement filter sets add a meaningful yearly running cost
- Listed at 27dB in sleep mode but up to 51dB at top speed, so expect to hear it when it's working hard — and the 100m² rating assumes gentle air changes, not rapid cleaning
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Our review
Winix's successor to the discontinued Zero is a four-stage HEPA purifier with a 410 m³/h clean air delivery rate, a particle sensor driving an auto mode, and a Wi-Fi app. The figure that decides it is the noise span, 27 to 51 dB, because the quiet end is what you live with at night and the loud end is what clears a room. It suits a large bedroom or living room where it can stay put.
What the numbers mean
CADR is the volume of cleaned air the fan delivers each hour. Winix rates the ZERO-S at 410 m³/h and its UK manual lists a verified room size of 100 m². Under a 2.4 m ceiling that is roughly 1.7 complete air changes an hour across 100 m², and more than eight an hour in a 20 m² bedroom, which is where the rating does real work. The filter stack is a washable pre-filter, an active carbon pellet layer for smells, an H13 HEPA filter and PlasmaWave, Winix's plasma stage, which the manual says can be switched off from the panel. HEPA deals with pollen, dust mite debris, pet dander and smoke particles; carbon deals with cooking and pet odours.
In a British home
The practical case is a hay fever or asthma household, a home beside a busy road, or the few days a year when wildfire smoke or Saharan dust lifts outdoor particulates, which our air quality tracker shows live. Auto mode reads a particle sensor and shows blue, amber or red; the manual says the sensor needs about four minutes after switch-on to settle. Sleep mode, triggered by a light sensor after dark or by hand, drops the fan below the normal low speed with the lights off. Winix says not to point it into a draught, to leave 30 to 45 cm clear around it, and to keep it out of bathrooms. It removes particles and odours only: it does nothing for carbon monoxide, which still needs a proper alarm.
How it compares
Philips's 2200 Series (AC2210), in the comparison, is the current rival: Philips publishes 420 m³/h and a lowest setting of 13 dB(A), which makes it the better fit if the purifier shares a bedroom, though its two published room sizes do not agree, so compare it on airflow. The Levoit Core 400S claims 166 m² and lists 24 to 52 dB in its manual, but gives its 433 m³/h CADR only in an image caption. The outgoing Winix Zero is the same design a generation back: 390 m³/h, a 99 m² rating and a published 40.8 dB.
Living with it
Winix quotes 3 to 70 W across the speeds and the UK manual rates it at 65 W, which at the Ofgem price cap unit rate of 26.32p per kWh for October to December 2026 is about 1.7p an hour flat out and a fraction of a penny on sleep. The replacement Filter H (part 116130) bundles the carbon and HEPA layers and is rated at around 12 months; the pre-filter is permanent and wants a vacuum every three months. The UK manual gives 384 by 220 by 594 mm and 7.6 kg, and it is controlled from the top panel, the WINIX Smart app, Alexa or Google. The manual gives a two-year warranty and Winix's site offers a third year on registration. Buying direct, Winix delivers to mainland Britain but not Northern Ireland, and a change-of-mind return has 14 days with the return postage at your cost.
Our verdict
Buy it for a large, fixed room where you want HEPA plus carbon with a sensible auto mode and a genuinely quiet night setting, and you can budget for one filter set a year. Look elsewhere if it will share a bedroom with a light sleeper, where the Philips 2200's lower noise floor counts for more than headline airflow, or if you plan to carry it between rooms daily. If the problem in the house is damp rather than dust, a dehumidifier does far more.
A researched review, built from the maker's specs, manual and UK listings; facts checked 21 Oct 2026. Sources: Winix Europe — ZERO-S air purifier product page (specifications, filter, shipping); Winix — ZERO-S WIFI UK user manual, AZSU350-JWB (specifications, modes, maintenance, warranty); Winix Europe — manuals index; Winix Europe — returns policy; Ofgem — energy price cap unit rates and standing charges (1 October to 31 December 2026).
Who shouldn't buy this
Skip it if you need to shift a purifier room to room daily — the loose front panel makes that awkward; a compact model is better suited.
Key specs
| Room size | Up to 100m² m² |
| CADR | 410 m³/h |
| Filter | 4-stage: H13 HEPA, carbon, PlasmaWave |
| Noise (min) | 27dB (sleep mode) dB |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the UK price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for A large living room or open-plan space where filtering speed and a quiet night setting both matter.
as of 4 Nov 2026, 19:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for A small-to-medium bedroom or home office on a budget
as of 4 Nov 2026, 19:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for A small bedroom or home office on the tightest budget
as of 4 Nov 2026, 19:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Questions
How loud is the Winix Zero-S?
Winix publishes a span of 27 to 51 dB. The low end is sleep mode, which the manual says runs below the normal low speed with the panel lights off; the top end is the highest of the four manual speeds.
How often do the Winix Zero-S filters need replacing?
The HEPA and carbon layers come as one set, Filter H (116130), and Winix says they last about 12 months; a check-filter light comes on when it is due. The pre-filter is never replaced, only vacuumed.
Can the Winix Zero-S run without PlasmaWave?
Yes. The manual says PlasmaWave is on by default, a press of its button disables it, and an indicator shows which state you are in. Winix also says a faint chirping sound from the unit is normal and not a fault.
Does the Winix Zero-S connect to Wi-Fi?
Yes. Winix's UK manual covers the ZERO-S WIFI, model AZSU350-JWB, which pairs with the WINIX Smart app and works with Alexa and Google Home; a three-second press of the Wi-Fi button starts pairing.
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