Best Air Purifier Under £100 UK (2026): What You Can (and Can’t) Get

Last updated: 8 June 2026

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🥇 Best overall: Levoit Core 300

🥈 Best for running costs / auto mode: Winix A231

🥉 Best CADR for larger rooms: Coway AP-1512HH

💰 Best step-up (c.£130): Levoit Core 300S

✅ Key Takeaways The best air purifier under £100 UK buyers can find in 2026 offers genuine True HEPA filtration — not HEPA-type — rated to capture 99.97% of particles down to 0.3 microns. If the listing does not say True HEPA, do not buy it. The Levoit Core 300 (CADR 187 m³/h, 24 dB sleep mode, 45W) is the strongest all-round pick at this price — compact, quiet, and ioniser-free. The Winix A231 (CADR 250 m³/h, 12-month filter, auto mode) has the lowest long-term running costs and is the better choice for anyone who wants set-and-forget operation. Its PlasmaWave ioniser should be disabled for bedroom use. The Coway AP-1512HH (CADR 396 m³/h, 24 dB sleep mode, auto mode) has the highest CADR in this guide and covers rooms up to 34 m² — but its ioniser is on by default and must be switched off. £100 is a legitimate budget for a single bedroom up to 20–34 m². What you give up at this price is app control, Wi-Fi, and large-room coverage. If those matter, the Levoit Core 300S at c.£130 is the natural step up.Running a purifier continuously on its lowest setting is more effective than running it intermittently on high. According to Asthma + Lung UK, indoor air pollutants including mould spores, dust mite debris, and pollen are leading triggers of asthma and allergic respiratory disease.

The best air purifier under £100 UK buyers can find in 2026 is better than ever — but this price bracket comes with trade-offs worth understanding before you buy. This guide covers the strongest options currently available, what they do well, where they fall short, and exactly when it makes sense to spend a little more.

The honest answer is that £100 is a genuinely useful budget for a single bedroom. You can get true HEPA filtration, reasonable room coverage, and quiet overnight operation at this price. What you largely give up is smart app control, large-room coverage, and the energy efficiency of newer DC motor models. Knowing that upfront stops you from being disappointed.

What £100 Actually Gets You

At the £100 mark in 2026, you should expect:

• True HEPA filtration — not HEPA-type (see below)
• CADR of 150–400 m³/h depending on model — suitable for bedrooms up to 20–34 m²
• Quiet operation on low settings — 24–40 dB, suitable for overnight use
• Basic to mid-range controls — fan speeds, sleep mode, and on some models an air quality sensor with auto mode
• Annual filter replacement costs of around £30–40

What you do not typically get at this price:

• Smartphone app or voice control
• Wi-Fi connectivity
• Coverage for rooms reliably over 35 m²
• DC motor efficiency — newer motors draw considerably less power for the same CADR

If app control and automated response to air quality matter to you, the jump to £130–150 is worth making. We cover the best step-up option at the end of this guide.

The HEPA-Type Trap: What to Avoid

The single biggest mistake buyers make in the under-£100 category is buying a purifier with a HEPA-type or HEPA-style filter. These are marketing terms with no guaranteed particle capture rate. They can perform dramatically worse than genuine True HEPA, which is certified to capture 99.97% of particles down to 0.3 microns.

Every model in this guide uses genuine True HEPA filtration. If a purifier you are looking at does not explicitly state True HEPA and reference a particle capture rate of 99.97% at 0.3 microns, treat it as HEPA-type and avoid it.

🥇 Levoit Core 300 — Best Overall Under £100

The Levoit Core 300 is the standout pick at this price point. It uses a genuine three-stage filtration system — pre-filter, True HEPA, and activated carbon — in a compact cylindrical body that draws air in from 360 degrees. That 360° intake means placement is flexible: you do not need to position it against a wall or worry about directional airflow. At 24 dB in sleep mode it is quiet enough to run overnight without noticing, and at around £80–85 on Amazon UK it sits comfortably within the £100 budget.

Specification	Detail
Filter	3-stage: pre-filter, True HEPA, activated carbon
CADR	187 m³/h — covers up to 20 m² at 4 air changes/hr
Noise	24 dB (sleep mode); 50 dB (maximum)
Power	45W
Running cost	~1p/hr at 24p/kWh; ~£44/year continuous
Auto mode	No — manual fan speed settings only
Ioniser	No — ioniser-free; safe for all environments
Filter life	6–8 months; four specialist filter types available
Annual filter cost	~£30–40
Warranty	2 years

Pros

Cons

No ioniser — completely safe for bedrooms, nurseries, and allergy sufferers without any settings adjustment 24 dB in sleep mode — among the quietest air purifiers at this price 360° intake allows flexible placement anywhere in the room Four filter types available — including pet allergy, toxin absorber, and mould/bacteria variants Compact and lightweight — easy to move between rooms2-year warranty

No auto mode or air quality sensor — you set the speed and leave it CADR 187 m³/h — lower than the Winix A231 and Coway at this price 45W power draw — higher than newer DC motor purifiers at the same price No app or Wi-Fi

🟦 Verdict: Levoit Core 300For a standard UK bedroom where you want to run a quiet, effective air purifier overnight without managing settings or connecting to an app, the Levoit Core 300 is the clear starting point. It is ioniser-free, straightforward, and genuinely quiet at 24 dB. If you want auto mode and lower long-term running costs, step up to the Winix A231.

🥈 Winix A231 — Best for Running Costs and Auto Mode

The Winix A231 (also sold as the Winix Zero Compact in some UK listings) stands out in this price bracket for two reasons: its 12-month filter life — the longest of any model in this guide — and its auto mode, which adjusts fan speed based on detected particle levels. Both meaningfully reduce the ongoing cost and effort of ownership. Its CADR of 250 m³/h also beats the Levoit Core 300, covering rooms up to 21 m² at 4 air changes per hour.

⚠️ Ioniser Warning: Disable PlasmaWave for Bedroom UseThe Winix A231 includes PlasmaWave ioniser technology, which produces trace amounts of ozone — a respiratory irritant at elevated levels. For bedroom use, disable PlasmaWave via the dedicated button on the unit. With PlasmaWave off, the A231 is a clean, effective True HEPA purifier. The button is clearly labelled and the setting is remembered between uses.

Specification	Detail
Filter	4-stage: pre-filter, True HEPA, activated carbon, PlasmaWave (disable for bedroom)
CADR	250 m³/h — covers up to 21 m² at 4 air changes/hr
Noise	40 dB (low speed); 58 dB (maximum)
Auto mode	Yes — built-in air quality sensor adjusts fan speed automatically
Ioniser	PlasmaWave included — disable for bedroom use
Filter life	12 months — longest in this guide
Annual filter cost	~£40 — one replacement per year
Warranty	2 years

Pros	Cons
12-month filter life — one replacement per year keeps long-term costs lower than most competitors Auto mode with air quality sensor — adjusts fan speed automatically; set-and-forget operation CADR 250 m³/h — higher than the Levoit Core 300 for the same budget 2-year warranty Compact 360° design; easy to position	PlasmaWave ioniser must be disabled for bedroom use — adds a step the Levoit Core 300 does not require 40 dB on low — louder than the Levoit Core 300 and Coway AP-1512HH sleep modes No app or Wi-FiFibre-based carbon filter — slightly less effective on odours than pelletised carbon alternatives

🟦 Verdict: Winix A231The Winix A231 is the smartest long-term buy in this guide. The 12-month filter and auto mode mean lower annual running costs and less manual management. Remember to disable PlasmaWave before placing it in a bedroom — it is a one-time step that takes five seconds and makes the unit safe for overnight use.

🥉 Coway AP-1512HH — Best CADR for Larger Rooms

The Coway AP-1512HH is a True HEPA purifier that regularly dips below £100 on Amazon UK, particularly during sales events. Its CADR of 396 m³/h is the highest of any model in this guide and enables coverage of rooms up to 34 m² at 4 air changes per hour — meaningfully more than the Levoit or Winix at equivalent pricing. It also includes an air quality indicator light and auto mode, giving real-time feedback on particle levels and automatic fan speed adjustment.

⚠️ Ioniser Warning: Switch Off Before Use The Coway AP-1512HH includes a Vital Ion ioniser that is switched on by default. For bedroom use, switch it off immediately. Ionisers produce trace amounts of ozone — a known respiratory irritant — and add no meaningful benefit when you already have True HEPA filtration. The switch is clearly labelled on the unit. With the ioniser off, the Coway is a clean, high-performance True HEPA purifier.

Specification	Detail
Filter	4-stage: pre-filter, deodorisation filter, True HEPA, Vital Ion (switch off)
CADR	396 m³/h (dust 246 / pollen 240 / smoke 233 cfm AHAM verified)
Coverage	Up to 34 m² at 4 air changes/hr — highest in this guide
Noise	24 dB (sleep mode); 54 dB (maximum)
Power	77W (maximum); Eco mode: ~5W
Running cost	~2p/hr at 24p/kWh on medium; Eco mode uses minimal power
Auto mode	Yes — air quality sensor with coloured LED indicator
Eco mode	Yes — fan stops when no pollution detected for 30 minutes
Ioniser	Vital Ion — on by default; must be switched off for bedroom use
Filter life	Deodorisation: 6 months; HEPA: 12 months
Annual filter cost	~£35–45
Warranty	1 year (motor and electronics: 3 years)

Pros	Cons
CADR 396 m³/h — the highest in this guide; covers rooms up to 34 m² AHAM-verified CADR — independently tested, not just a manufacturer claim24 dB in sleep mode — as quiet as the Levoit Core 300 Auto mode with air quality sensor and coloured LED indicator Eco mode stops the fan when air is clean — lowest running costs in active usePrice regularly dips below £100 on Amazon UK	Ioniser is on by default — must be switched off before bedroom use 77W power draw at maximum — highest in this guide Shorter warranty at 1 year (3 years motor/electronics only) Price fluctuates — confirm it is under £100 before purchasing No app or Wi-Fi

🟦 Verdict: Coway AP-1512HHIf your bedroom or living space is above 20 m², the Coway AP-1512HH is the only model in this guide with the CADR to cover it properly. Switch off the ioniser immediately and you have a high-performing True HEPA purifier at a price the Levoit and Winix cannot match for larger spaces. Check the Amazon UK price before buying — it is not always under £100.

Quick Comparison: Best Air Purifiers Under £100 UK

Feature	Levoit Core 300	Winix A231	Coway AP-1512HH
Filter	3-stage True HEPA + carbon	4-stage True HEPA + carbon	4-stage True HEPA + carbon
CADR	187 m³/h	250 m³/h	396 m³/h
Coverage	Up to 20 m²	Up to 21 m²	Up to 34 m²
Noise (low)	24 dB (sleep mode)	40 dB	24 dB (sleep mode)
Power	45W	Not specified	77W
Auto mode	No	Yes — air quality sensor	Yes — air quality sensor
Ioniser	No — ioniser-free	⚠️ PlasmaWave — disable for bedroom	⚠️ On by default — must disable
Filter life	6–8 months	12 months	6 months (carbon) / 12 months (HEPA)
Annual filter cost	~£30–40	~£40	~£35–45
Warranty	2 years	2 years	1 year (motor: 3 years)
Best for	Simple bedroom use; first purifier	Lowest running costs; auto mode	Larger rooms; air quality monitoring
Buy	Core 300 →	Winix A231 →	Coway AP-1512HH →

Understanding Running Costs: The Number Everyone Ignores

The purchase price is only part of what you will spend. A purifier running continuously has two ongoing costs: electricity and filter replacements. Based on the Ofgem unit rate of 24p/kWh:

Model	Power draw	Cost/hr at 24p/kWh	Annual electricity*	Annual filter cost
Levoit Core 300	45W	~1p/hr	~£44	~£30–40
Winix A231	n/a	—	—	~£40 (12-month filter)
Coway AP-1512HH	77W	~2p/hr	~£76	~£35–45

*Annual electricity cost based on 8 hours per day overnight use. Running 24 hours costs proportionally more.

Total cost of ownership over three years for a typical unit in this guide: approximately £80–95 (unit) + £90–120 (filters) + £30–60 (electricity at 8 hrs/day) = £200–275. That context matters when comparing a £90 unit to a £150 unit with lower annual running costs.

The Winix A231’s 12-month filter is the standout here for long-term savings. One filter replacement per year at around £40 versus two replacements at £30–40 each for the Levoit adds up meaningfully over three to five years of ownership.

When £100 Is Not Enough: Honest Advice

There are situations where spending more is the right call. Being clear about this makes the guide more useful and stops you buying twice.

• Your room is over 35 m². The Coway AP-1512HH at 396 m³/h CADR covers the largest spaces in this guide, but for open-plan living rooms or whole-floor coverage you need something larger. See our full guide to the best air purifier for asthma UK which covers the Levoit Core 400S and Winix 5500-2.
• You have asthma or severe allergies. Auto mode — available on both the Winix A231 and Coway AP-1512HH in this guide — responds to detected particle levels automatically. If you need a unit that also monitors and reacts in real time via an app, the Levoit Core 300S at c.£130 is the step up.
• You want app and voice control. No model under £100 offers these. The Levoit Core 300S at c.£130 adds a laser PM2.5 sensor, auto mode, VeSync app, and Alexa/Google Home integration with the same True HEPA filtration as the Core 300.
• You want to treat multiple rooms. Two budget units covering two small rooms will cost more in filters annually than one mid-range unit with a larger CADR. Run the numbers for your situation before buying two.

Ready to Spend a Little More? The Best Step-Up

If your budget stretches to around £130, the Levoit Core 300S is the natural upgrade from the Core 300. It adds a laser air quality sensor, auto mode that adjusts fan speed in response to detected particles, VeSync app control, and Alexa and Google Home compatibility — all with the same True HEPA filtration in a near-identical form factor. At 26W versus 45W it is also considerably more energy-efficient. For anyone with allergies or asthma where automated response to air quality matters, the extra outlay is justified.

How to Get the Most From a Budget Air Purifier

• Run it continuously on the lowest setting rather than intermittently on high. Constant low-level filtration produces better results than occasional bursts.
• Put it in the bedroom. This is where you spend the most passive time and where air quality has the most direct impact on sleep, breathing, and long-term health.
• Keep doors and windows closed when it is running. Purifying air that is constantly refreshed from outside is a losing battle.
• Replace filters on schedule. A clogged HEPA filter has sharply reduced efficiency. Most units have a filter life indicator — use it.
• Position it away from walls. Most units need at least 20–30 cm of clearance on all sides for proper airflow. The Levoit Core 300 and Winix A231’s 360° intakes give more placement flexibility than directional units.
• For overnight bedroom use, switch ionisers off. The Winix A231’s PlasmaWave and the Coway AP-1512HH’s Vital Ion should both be disabled before use in any sleeping environment.

Frequently Asked Questions

Is £100 enough for a decent air purifier?

Yes, for a single bedroom up to 20–34 m². At £100 you can get genuine True HEPA filtration, a CADR of 187–396 m³/h, and noise levels as low as 24 dB. What you give up is app control, Wi-Fi, and the coverage needed for large open-plan spaces. For a bedroom, £100 is a legitimate and effective budget.

What is the difference between True HEPA and HEPA-type?

True HEPA is a certified standard: 99.97% particle capture at 0.3 microns. HEPA-type is an unregulated marketing term with no guaranteed performance. In practice, HEPA-type filters can capture significantly fewer particles. Every model in this guide uses True HEPA. If a listing does not state True HEPA explicitly with a 99.97% capture rate, treat it as HEPA-type and avoid it.

How big a room can a £100 air purifier handle?

It depends on the model. The Levoit Core 300 covers up to 20 m² at 4 air changes per hour. The Winix A231 covers up to 21 m². The Coway AP-1512HH covers up to 34 m² — the largest in this guide. For open-plan spaces above 35 m², you need a higher CADR than £100 typically buys.

Should I leave my air purifier on all the time?

Yes, ideally. Air quality in a sealed room degrades within one to two hours without active filtration. Running on the lowest, quietest setting continuously produces better results than running at high speed for short periods. All three models in this guide are designed for continuous use, and at low settings the electricity cost at 24p/kWh is minimal — around 1–2p per hour.

Do I need to disable the ioniser?

Yes, for the Winix A231 (PlasmaWave) and Coway AP-1512HH (Vital Ion). Ionisers produce trace amounts of ozone — a respiratory irritant — and add no meaningful benefit alongside True HEPA filtration. On both models, the off switch is clearly labelled and takes seconds. The Levoit Core 300 has no ioniser and requires no adjustment.

Do I need both an air purifier and a dehumidifier?

In many UK homes, yes. An air purifier removes particles already airborne — mould spores, dust mite debris, pollen. A dehumidifier removes the excess moisture that causes mould and dust mites to proliferate in the first place. If you have condensation on windows or visible damp, a dehumidifier addresses the root cause; the air purifier handles what is already in the air. See our guide to the best dehumidifier for mould UK for the full picture.

What CADR do I need for my bedroom?

CADR — Clean Air Delivery Rate, measured in m³/h — tells you how much clean air the purifier delivers per hour. As a rule of thumb, aim for a CADR equal to at least twice your room volume for adequate air changes. A standard UK double bedroom (14 m² at 2.4 m ceiling height) has a volume of around 34 m³ — a CADR of 68 m³/h covers 2 air changes per hour; 187 m³/h gives you over 5. All three models in this guide comfortably exceed the minimum for standard UK bedrooms.

How often do I need to replace the filter?

The Levoit Core 300 filter typically lasts 6–8 months; replacement costs around £30. The Winix A231 filter lasts 12 months at around £40 — the best value in this guide. The Coway AP-1512HH has two filter stages: the deodorisation filter every 6 months and the HEPA filter every 12 months. All three models have filter replacement indicators that tell you when to change.

The Bottom Line

The best air purifier under £100 UK buyers should consider in 2026 is the Levoit Core 300 — genuine True HEPA filtration, compact 360° design, 24 dB in sleep mode, and no ioniser to worry about. It is the simplest, safest pick for a bedroom.

For buyers where long-term running costs matter most, the Winix A231‘s 12-month filter and auto mode make it the smarter financial choice over three-plus years. Disable PlasmaWave before bedroom use and it is an excellent, low-maintenance purifier.

For rooms above 20 m² where the Levoit and Winix cannot cover the space adequately, the Coway AP-1512HH‘s CADR of 396 m³/h is in a different league at this price. Switch off the ioniser immediately, check the Amazon UK price before buying, and you have the most powerful True HEPA purifier available in this guide.

Whatever you choose: make sure it says True HEPA, put it in your bedroom, disable any ioniser, and run it continuously on the lowest setting. The rest is detail.

Related Reading

For more on air quality in UK homes, see our guides on the best air purifier for asthma UK, the best air purifier for hay fever UK, the best air purifier for a baby room UK, the best dehumidifier for mould UK, and dehumidifier vs air purifier UK — which do you need?.

About This Article Written by the editorial team at UK Air Quality, a specialist site covering air purifiers, dehumidifiers, and home climate products for UK buyers. All CADR figures are cross-referenced against AHAM-verified data where available. Running cost estimates are based on the Ofgem unit rate of 24p/kWh. External sources: Asthma + Lung UK — indoor air quality and respiratory health | NHS — air quality and health | AHAM — CADR verification standard