Our editorial score
Derived from a five-factor rubric, not laboratory testing. How scoring works
HEAPETS P358 Review
An A4-sized unit with a washable pre-filter and a 25 dB sleep mode — but the 2,500 sq ft coverage claim sits awkwardly against the 176 CFM CADR the same listing publishes, and it carries the lowest owner rating here.
- Footprint about the size of an A4 sheet of paper
- H13 HEPA with a washable electrostatic pre-filter
- 25 dB sleep mode with display lights switched off
Best for: Small rooms where floor space is tight · Specifications last checked September 24, 2026
Overview
The P358 is built around one clear idea: a purifier small enough that you will actually leave it out. Its footprint is about the size of an A4 sheet of paper, it runs at 25 dB in sleep mode with the display lights off, and it offers five fan speeds, a timer and a filter-life reminder. The dual-sided air inlets are designed to draw air in from two directions so that airborne pet hair is captured before it settles, and the replacement filter uses electrostatic pre-filter pads plus a composite filter — the listing claims those pads extend the main HEPA filter’s life from three months to six, which it frames as a saving of about 50% on replacement costs.
Its certifications cover safety and emissions rather than performance: ETL, EPA, FCC and CE, plus CARB compliance. That is worth having, but it is not a cleaning-performance guarantee.
The honest assessment is that this is the weakest model in our comparison, for two reasons. It carries the lowest owner rating here at 4.1 out of 5, and its 2,500 square foot coverage claim is not supported by the 176 CFM CADR the same listing publishes: 176 CFM is 10,560 cubic feet per hour, and one air change per hour across 2,500 square feet only closes at a ceiling height of about four feet. The coverage figure assumes one air change per hour at maximum fan speed, which is not a setting you would live with. Buy it as a genuinely compact purifier for a small room, and judge it on that.
More angles
More from the manufacturer's product listing. These include the brand's own annotated graphics as well as plain product shots. We reproduce them unaltered, so any performance figure printed inside an image is the manufacturer's claim — it is not a measurement of ours, and it is not why a model ranks where it does here.
Key specifications
As published by HEAPETS, cross-checked September 24, 2026.
| Certification | ETL, EPA, FCC, CE; CARB compliant and California-compliant for indoor cleaning equipment |
|---|---|
| Stated coverage | Up to 2,500 sq ft once per hour (1 air change per hour) — manufacturer claim; CADR is published at 176 CFM but does not support this area |
| Footprint | About the size of an A4 sheet of paper |
| Sleep-mode noise | 25 dB with display lights turned off |
| Filter | H13 HEPA with a dual-sided electrostatic pre-filter |
| Air inlets | Dual-sided U-shaped inlets |
| Controls | Five fan speeds, timer, filter-life reminder, Pet Lock |
| Claimed running cost | About 50% less on filters — the manufacturer's basis is that its electrostatic pre-filter pads extend main-filter life from 3 months to 6 months, not annual replacement |
| CADR figure | 176 CFM (295 m³/h) — self-reported; absent from the AHAM Verifide directory (searched 24 September 2026) |
| Owner rating (listing) | 4.1 out of 5 — lowest in this comparison |
Pros
- A4-sized footprint means it can sit out without dominating a room
- 25 dB sleep mode with lights off is genuinely unobtrusive
- Dual-sided inlets target airborne pet hair from two directions
- Washable electrostatic pre-filter pads reduce running costs
- Lowest purchase price in this comparison
Cons
- Lowest owner rating here at 4.1 out of 5
- Absent from the AHAM Verifide directory — the published 176 CFM CADR is self-reported
- The 2,500 sq ft coverage claim is not supported by the machine’s own CADR figure, let alone its physical size
- Newer brand with a shorter reliability record
Who it's for
- Small rooms and apartments where floor space is the binding constraint
- Buyers who want a purifier quiet enough to run overnight in a small bedroom
- Anyone prioritising low upfront price and low filter running costs
Who should skip it
- Large rooms — the coverage claim should not be relied on
- Buyers who want certified, independently measured cleaning performance
- Anyone who weights owner-reported reliability heavily, given the 4.1 rating
How it compares with similar models
Sources & verification
- Manufacturer-published specification and feature copy on the HEAPETS P358 US listing, cross-checked 24 September 2026 — HEAPETS publishes no brand-site page for this model
- Self-reported CADR of 176 CFM (295 m³/h) as published on the manufacturer listing, cross-checked 24 September 2026 — neither this model nor the HEAPETS brand appears in the AHAM Verifide directory (queried directly 24 September 2026)
- Certification claims (ETL, EPA, FCC, CE, CARB) as stated on the listing, cross-checked 24 September 2026
- Owner rating as published on the Amazon US listing for this ASIN, read 24 September 2026
Our recommendations are based on independent research and are not sponsored. Specifications last checked September 24, 2026.