The Ionmax Leone Pro ION626 is a 25 L/day compressor dehumidifier with integrated H13 HEPA air purification, suited to medium-sized spaces up to 80 m² — large bedrooms, living areas, home offices and apartments. WiFi app control, PM2.5 air-quality indicator, and a 2.9 L tank with continuous-drain option.

Who it's for

Australian households needing solid moisture-removal capacity for medium-sized rooms — main bedrooms, living rooms, home offices, apartments and townhouse upper levels. Best suited to warmer climates and heated rooms, where the compressor cycle is most efficient. For unheated cool spaces below ~10°C, a desiccant unit such as the Ionmax Vienne ION630 will keep working where compressor models slow down. The Leone Pro sits between the Shinco SDZ-10L (small rooms, 12 m²) and the Rhine Pro ION650 (large open-plan, 120 m²) in our range.

Key features and specifications

Type: Compressor (refrigerant) dehumidifier with integrated H13 HEPA air purifier
Capacity: 25 L/day at 30°C / 80% RH without HEPA filter; 20 L/day with HEPA filter fitted
Coverage: up to 80 m² (200 m³ at 2.5 m ceiling height)
H13 HEPA filter — manufacturer-stated 99.95% capture of fine airborne particles (test conditions on Ionmax datasheet)
PM2.5 sensor with colour-changing air-quality indicator (clean / fair / poor)
WiFi app control (remote monitoring, scheduling, humidity setpoint)
Auto pause/restart at target humidity
Water tank: 2.9 L with overflow protection
Continuous drainage option (hose supplied)
Noise: ≤47 dB
Power: 400 W; 220–240 V AC, 50 Hz
Dimensions: 360 × 265 × 569 mm (W × D × H)
Weight: 14.8 kg
Modes: Dehumidify + Purify, or Air Purify only
Warranty: 2 years

How it works

Uses a refrigeration cycle to cool incoming air below its dew point
Moisture condenses on cold coils and drips into the tank
Dry air is then circulated back into the room through the HEPA filter
Most efficient in warmer conditions; performance drops below ~15°C
The HEPA filter sits in the airflow path, so the same fan drives both dehumidification and filtration — useful for combined moisture and particle control, but filter loading slightly reduces moisture-removal capacity (25 L/day drops to 20 L/day with HEPA fitted, per Ionmax's specifications)
A HEPA-equipped dehumidifier is not a substitute for a dedicated HEPA air purifier sized for the room — the airflow rate is optimised for dehumidification first

The research behind humidity control

The key research findings for indoor humidity and dust mite control:

Arlian et al. (JACI, 1999) — keeping mean daily indoor RH below 50% restricted dust mite population growth by more than 97%, even when humidity briefly spiked above 50% for a few hours.
Cabrera et al. (JACI, 2001) — homes maintaining indoor RH below 51% across a humid summer had mite allergen levels more than 10× lower than humid homes after 17 months.
For a medium-capacity unit like the Leone Pro, the goal is sustained humidity control across a whole room rather than peak moisture-removal numbers.

Why a multi-faceted approach works better than any single tool

Reviews of dust mite intervention studies consistently find that single interventions deliver modest results, but combined approaches deliver meaningful reductions. The 2024 review The Prevention of House Dust Mite Allergies in Pediatric Asthma (Children, MDPI) concluded that most benefits come from combining several interventions rather than relying on one. A multi-faceted approach typically combines:

Reducing humidity — what this dehumidifier does. Aim for 40–50% RH year-round.
Tracking humidity — pair with an air quality monitor or hygrometer so you can confirm the room is actually staying in range.
Encasing bedding — dust mite covers for mattress, pillows and quilt are the single most-evidenced bedroom intervention.
Filtering airborne allergens — the Leone Pro's integrated HEPA filter covers airborne particles in this room; a dedicated HEPA air purifier is appropriate where you want filtration in a separate room.
Neutralising allergens on textiles — an allergen-neutralising spray treats sofas, rugs and other soft surfaces that aren't easily encased.
Removing settled allergens — regular vacuuming and washing bed linens in hot water.

A dehumidifier on its own helps, but the research is clear: it works best as part of a layered approach.

Sources: Arlian, L.G. et al. (1999) "Reducing relative humidity to control the house dust mite Dermatophagoides farinae", J Allergy Clin Immunol 104(4 Pt 1): 852–6. Cabrera, P. et al. (2001) "Reducing relative humidity is a practical way to control dust mites and their allergens in homes in temperate climates", J Allergy Clin Immunol 107: 99–104. Calabria, C. et al. (2024) "The Prevention of House Dust Mite Allergies in Pediatric Asthma", Children (MDPI) 11(4): 469.

What it doesn't do

The Leone Pro is a dehumidifier with HEPA filtration, not a medical device:

HEPA capture percentage (99.95%) is the manufacturer's stated figure; test conditions are on the Ionmax datasheet
Doesn't remove existing mould — reduces the conditions that favour new mould growth; if you have visible mould, treat the affected surface and identify the moisture source first
Reduces airborne particles in a single room — doesn't sanitise air, kill viruses, or replace mechanical ventilation in a damp building
Not a medical device. We don't make claims about treating asthma, allergies or any other health condition

FAQs

What room size is the Leone Pro suited to? Up to 80 m² — main bedrooms, medium-to-large living areas, home offices and small apartments. For a single small room, a 10–12 L/day unit is more cost-effective; for large open-plan spaces (>80 m²), step up to the Rhine Pro ION650.

How much water will it actually remove per day in my home? The 25 L/day figure is rated at 30°C and 80% RH — very warm, very humid conditions. At more typical Australian indoor conditions (around 27°C, 60% RH) you'll see meaningfully less. With the HEPA filter fitted the rated maximum drops to 20 L/day. The rated figure is a maximum, not a daily average.

Compressor or desiccant for my situation? The Leone Pro is a compressor — efficient in warm conditions, less so when ambient temperatures fall below ~15°C. For unheated cool spaces, a desiccant such as the Ionmax Vienne ION630 (works down to 1°C) is the better choice.

How loud is it? ≤47 dB — about the level of a quiet conversation or a refrigerator hum. Suitable for living areas and large bedrooms; some users find higher fan speeds noticeable overnight.

Can it run continuously? Yes — connect the supplied hose to the drain outlet for gravity drainage to a floor drain or sink. Otherwise the 2.9 L tank fills up and the unit shuts off; overflow protection prevents spills.

Does the HEPA filter need replacement? Yes — H13 HEPA filters are consumable and need periodic replacement; refer to the Ionmax datasheet for recommended interval based on usage. The dehumidifier's particle pre-filter is washable.

Care notes

Empty the 2.9 L water tank as needed (or use continuous drainage)
Wash the pre-filter monthly
Replace the H13 HEPA filter per the Ionmax recommended interval
Wipe the cabinet with a dry cloth
Don't operate the unit immediately after moving it from cold storage — let it equalise to room temperature first
Use on a level surface

Warranty: 2 years.

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