Expert Guide
Best Air Purifiers Under £100 UK (2026)
Best Air Purifiers Under £100 UK (2026)
Written By
James D.
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What £100 Actually Buys You in 2026
The under-£100 air purifier market has improved significantly in recent years, largely driven by competition from Chinese brands now available on Amazon UK and from retailers like Argos and John Lewis. However, it remains a minefield. For every genuinely capable unit at this price point, there are ten with "HEPA-type" filters (not real HEPA), inadequate fan motors that cannot cycle air fast enough to matter, and laughably inflated room-size claims. What you should realistically expect for under £100: True HEPA filtration for rooms up to 20 m², app control or at least basic auto mode, reasonably quiet operation (under 45 dB on high), and filter replacements available in the UK. What you should not expect: VOC or gas sensing, a heavy activated carbon stage, or coverage of large rooms. Use an under-£100 purifier in a bedroom or small office, not in a 40 m² open-plan kitchen. Temper expectations accordingly and you will be pleasantly surprised.
Best Air Purifiers Under £100 UK
Verified True HEPA models with UK filter availability.
| Model | CADR | Smart? | Filter Cost | Coverage | Price | Score |
|---|---|---|---|---|---|---|
| Levoit Core 200S | 170 m³/h | Yes | £29/6mo | 35 m² | £99 | 8.5 |
| Xiaomi Smart 4 Lite | 360 m³/h | Yes | £35/yr | 43 m² | £89 | 8.7 |
| Philips Series 800 | 190 m³/h | No | £30/6mo | 49 m² | £75 | 8.0 |
| Levoit Core Mini | 110 m³/h | Yes | £19/6mo | 17 m² | £49 | 7.8 |
Best Value Under £100
Xiaomi Smart Air Purifier 4 Lite
The Xiaomi Smart Air Purifier 4 Lite is the best pure performance-per-pound at this price bracket. Its 360 m³/h CADR is extraordinary for sub-£100 — it is more powerful than some £200 units from established Western brands. The Mi Home app is solid, and filter replacements are genuinely affordable.
Coverage
43 m²
Running Cost
£35 / 6-12mo
Best Smart Budget Pick
Levoit Core 200S Smart Air Purifier
The Levoit Core 200S sits right at the £99 ceiling but offers the polished VeSync app ecosystem, quiet sleep mode, and H13 HEPA. It lacks the raw power of the Xiaomi but is quieter, better looking, and the Levoit brand has excellent UK customer support.
Coverage
35 m²
Running Cost
£29 / 6mo
The Filter Trap: Check Before You Buy
The single most important secondary check when buying a budget air purifier is filter availability and cost. Several brands sell cheap units and then make their money on proprietary replacement filters that are expensive, hard to find, or both. Before purchasing any unit, search for "replacement filter for [model name] UK" and verify that they are readily available on Amazon UK, John Lewis, or the manufacturer's UK site, and that the cost is under £40 per replacement. If the filter is over £40 or only available direct from the manufacturer with a long lead time, look elsewhere. Our picks above all have affordable, widely available UK filter supplies.
Budget Air Purifier FAQs
Are cheap air purifiers any good?expand_more
What is the best air purifier under £100 for a bedroom?expand_more
How long do budget air purifiers last?expand_more
Summary
For raw power under £100, the **Xiaomi Smart 4 Lite** wins convincingly. For a more polished experience with better app integration, the **Levoit Core 200S** is worth the extra few pounds.
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