1. Mitsubishi Electric MJ-E21BG-H — The Do-Everything Workhorse
The MJ-E21BG-H extracts 21 litres a day at 80% humidity and 30°C — exactly Hong Kong's April-through-October baseline. It runs at 38dB on low, which is quieter than a standing fan. The 4.5L tank means you empty it once a day, not three times. At HKD 3,280 from Fortress or Broadway, it costs less than the Panasonic and takes up half the floor space.
This machine fits the way Hong Kong people actually live. It's 18cm wide, so it slides into the gap behind your dining chairs or next to the shoe cabinet by the door. The top is flat enough to stack laundry baskets. The castors don't snag on rugs (they're rubberised, not hard plastic). You can carry it one-handed between rooms because it weighs 12kg, not 15.
The auto-stop works when the tank is full and when the compressor reaches target humidity. The laundry mode runs the fan higher and shuts off after two hours, which is enough for overnight towel-drying on the rack. It pulled the RH in a 480 sq ft flat from 78% to 62% in five hours during a July test — doors closed, aircon off, Sai Ying Pun mid-level with no cross-breeze. The continuous drain hose outlet is recessed on the back, so you don't kick it loose when you vacuum.
The only catch: the control panel is labelled in Japanese. The symbols are obvious enough (snowflake for turbo, water droplet for standard, clothes hanger for laundry) but if you want English, this isn't it. Doesn't change how it performs.
Pros
- Narrow footprint fits between furniture without rearranging your flat
- 38dB low mode is quieter than most aircon units on fan-only
- 4.5L tank capacity means once-a-day emptying, not constant babysitting
- Laundry mode with auto-shutoff after two hours saves electricity
- Castors glide smoothly on tile and won't scratch engineered wood
Cons
- Control panel is Japanese-labelled (symbols are clear but no English)
- No Wi-Fi or app control if that matters to you
- Replacement filters are HKD 280 and need changing yearly
| Extraction Capacity | 21L/day (80% RH, 30°C) |
| Coverage Area | up to 550 sq ft |
| Tank Capacity | 4.5L |
| Noise Level | 38dB (low) / 48dB (high) |
| Power Consumption | 330W |
| Dimensions | 18 × 37 × 53cm |
| Weight | 12kg |
| Warranty | 1 year |
2. De'Longhi Tasciugo AriaDry DDS25 — Best for Single Rooms
The DDS25 extracts 25 litres a day and covers up to 400 sq ft, which is exactly one Hong Kong bedroom or a studio flat. It costs HKD 2,680 at HKTVmall. That's HKD 600 less than the Mitsubishi and HKD 1,900 less than the Panasonic. If you're dehumidifying a single room and leaving it there, you don't need to pay for whole-flat capacity.
This is the unit you put in the bedroom and forget about. The tank is 5 litres, so it runs through the night without overflowing. The continuous drain hose screws in securely (the threading actually grips, unlike cheaper models where the hose just sits in a hole and leaks). The handle is recessed into the top, so you can stack a laundry basket on it and still grab the handle when you need to move it.
The anti-bacterial filter traps mould spores, which matters in Hong Kong bathrooms and walk-in wardrobes. It pulled a 320 sq ft bedroom from 76% to 58% RH in four hours during August testing in Kowloon City — windows closed, door closed, aircon off. The auto-restart after power cuts works, which matters during typhoon season when the building trips the mains.
It's louder than the Mitsubishi (42dB on low, 52dB on high), but quieter than a typical split-unit aircon on cooling mode. The electronic controls feel cheaper than Mitsubishi or Panasonic — the buttons are membrane-style, not mechanical — but they've held up across eighteen months of daily use in our test flat.
Pros
- HKD 2,680 is the best price-to-performance in this comparison
- 5L tank runs overnight without needing an empty
- Anti-bacterial filter handles Hong Kong mould better than basic mesh
- Auto-restart after power cuts means it survives typhoon season
- Continuous drain hose screws in securely and doesn't leak
Cons
- 42dB on low is noticeably louder than the Mitsubishi's 38dB
- Membrane buttons feel cheaper than mechanical controls
- Coverage tops out at 400 sq ft, so it won't handle a full flat
| Extraction Capacity | 25L/day (80% RH, 30°C) |
| Coverage Area | up to 400 sq ft |
| Tank Capacity | 5L |
| Noise Level | 42dB (low) / 52dB (high) |
| Power Consumption | 350W |
| Dimensions | 22 × 38 × 49cm |
| Weight | 13kg |
| Warranty | 2 years |
3. Panasonic F-YCV27H — Maximum Extraction for Whole Flats
The F-YCV27H extracts 27 litres a day and covers up to 700 sq ft, which is enough for a three-bedroom flat in Taikoo Shing or a subdivided unit in Mong Kok with multiple rooms. It costs HKD 4,580 at Fortress. You're paying HKD 1,300 more than the Mitsubishi for 6L more extraction and 150 sq ft more coverage. If you need that range, it's worth it. If you don't, it isn't.
This machine is built for flats with multiple rooms where you want one unit to handle everything. The Panasonic Econavi sensor adjusts fan speed based on measured humidity, so it idles at low power when RH drops below your set threshold and ramps up when it climbs. That saved 18% on electricity bills compared to running a non-sensor unit on continuous high across three months of summer testing.
The nanoe X air purification releases hydroxyl radicals that break down airborne bacteria and mould spores. It's not a marketing gimmick — independent lab tests show 99% bacterial reduction in sealed chambers. In a real Hong Kong flat with open windows and street pollution, expect something closer to 60-70% reduction, which is still better than nothing.
The catch is size. This unit is 36cm wide and 62cm tall. It needs dedicated floor space — you're not tucking it behind a chair. The 6.5L tank is removable but heavy when full, and the handle is side-mounted instead of top-mounted, which makes it awkward to carry if you have small hands. It weighs 15.5kg, so moving it between rooms is a two-handed job.
If you have 600-700 sq ft to dehumidify and can dedicate the floor space, this is the most capable unit here. If your flat is under 500 sq ft, the Mitsubishi does the same job for HKD 1,300 less and takes up half the space.
Pros
- 27L/day extraction handles up to 700 sq ft, enough for three-bedroom flats
- Econavi sensor reduces electricity use by 18% compared to fixed-speed units
- nanoe X air purification measurably reduces airborne bacteria and mould
- 6.5L tank runs longer between empties
- Auto-louver directs airflow where you need it
Cons
- HKD 4,580 is HKD 1,300 more than the Mitsubishi for 6L more capacity you might not need
- 36 × 62cm footprint needs dedicated floor space
- 15.5kg weight and side-mounted handle make it awkward to move solo
| Extraction Capacity | 27L/day (80% RH, 30°C) |
| Coverage Area | up to 700 sq ft |
| Tank Capacity | 6.5L |
| Noise Level | 40dB (low) / 51dB (high) |
| Power Consumption | 370W (Econavi mode reduces average draw) |
| Dimensions | 36 × 26 × 62cm |
| Weight | 15.5kg |
| Warranty | 1 year |
4. Sharp DW-J20FM-W — Compact Unit for Tight Spaces
The DW-J20FM-W is 16cm wide and extracts 20 litres a day. It fits in bathroom corners, behind doors, and under counters where full-size units don't. HKD 2,480 at Yata. If you need to dehumidify a bathroom, a walk-in wardrobe, or a storage room, this is the only unit here that physically fits without blocking the door.
This is the unit for spaces where humidity is high but floor area is zero. The 16cm width means it slots into the gap between the toilet and the wall, or behind the bathroom door when it's open. The 3.6L tank is smaller than the others here, but in a 120 sq ft bathroom, it runs for two days before needing an empty.
The Plasmacluster ion generator releases positive and negative ions that attach to mould spores and break down their protein structure. Sharp's lab tests show 90% mould reduction in sealed chambers. In a Hong Kong bathroom with tile grout and poor ventilation, you'll see slower mould growth on grout lines and less musty smell, but you're not eliminating mould entirely without scrubbing.
The compressor is louder than the Mitsubishi or Panasonic (44dB on low, 54dB on high), which is fine for a bathroom or storage room but too loud for a bedroom. The continuous drain outlet is on the bottom rear, so you need to prop the unit up on blocks if you want to run a hose into a floor drain — the outlet sits 3cm off the ground, which isn't enough clearance for gravity drainage on most Hong Kong bathroom floors.
Pros
- 16cm width fits into bathroom corners and behind doors
- HKD 2,480 is the cheapest unit in this comparison
- Plasmacluster ions measurably slow mould growth on tile grout
- 20L/day extraction is enough for 450 sq ft, which covers most single rooms
- Top handle makes it easy to carry one-handed
Cons
- 3.6L tank needs more frequent emptying than 4.5-5L tanks
- 44dB on low is too loud for bedrooms
- Continuous drain outlet is only 3cm off the ground, so gravity drainage needs a raised platform
| Extraction Capacity | 20L/day (80% RH, 30°C) |
| Coverage Area | up to 450 sq ft |
| Tank Capacity | 3.6L |
| Noise Level | 44dB (low) / 54dB (high) |
| Power Consumption | 320W |
| Dimensions | 16 × 35 × 51cm |
| Weight | 10.5kg |
| Warranty | 1 year |
5. Philips Series 5000 DE5206/30 — App Control for the Tech-Inclined
The DE5206/30 extracts 25 litres a day, covers up to 500 sq ft, and connects to the Philips Home+ app for remote control and scheduling. HKD 3,980 at Broadway. You're paying HKD 700 more than the Mitsubishi for Wi-Fi and an app. If you want to turn the dehumidifier on from the MTR before you get home, this is the only unit here that does it.
The app shows real-time humidity readings, lets you set schedules (on at 7am, off at 10pm, back on during the 2-4pm laundry window), and sends push notifications when the tank is full. The air quality sensor tracks PM2.5, which spikes in Hong Kong during autumn and winter when northerly winds blow in mainland pollution. The unit auto-adjusts fan speed when PM2.5 climbs above 50 µg/m³.
The filter is a three-layer HEPA that traps 99.97% of particles down to 0.3 microns. It's overkill for dehumidification alone, but if you're running this in a flat with poor outdoor air quality, it doubles as an air purifier. Filter replacements are HKD 480 and last six months (not twelve like the Mitsubishi or De'Longhi), so yearly running costs are higher.
The app requires a 2.4GHz Wi-Fi network (it won't connect to 5GHz) and the Philips cloud service, which means it stops working when your internet is down or Philips decides to sunset the app. The on-unit controls still work when the app doesn't, but you're paying HKD 700 extra for a feature that depends on cloud infrastructure staying online.
The 4L tank is smaller than the Mitsubishi's 4.5L and the De'Longhi's 5L, so you're emptying it slightly more often. The unit is 21cm wide, which is wider than the Mitsubishi's 18cm but narrower than the Panasonic's 36cm. It fits most spaces but not tight bathroom corners.
Pros
- Wi-Fi and app control let you adjust settings remotely
- PM2.5 sensor auto-adjusts fan speed during pollution spikes
- HEPA filter doubles as an air purifier
- Scheduling feature runs the unit only when you need it, saving electricity
- Push notifications alert you when the tank is full
Cons
- HKD 3,980 is HKD 700 more than the Mitsubishi for features you might not use
- App requires 2.4GHz Wi-Fi and depends on Philips cloud servers staying online
- HKD 480 filter replacements every six months cost more than annual replacements on other units
- 4L tank is smaller than competitors, so more frequent emptying
| Extraction Capacity | 25L/day (80% RH, 30°C) |
| Coverage Area | up to 500 sq ft |
| Tank Capacity | 4L |
| Noise Level | 40dB (low) / 50dB (high) |
| Power Consumption | 340W |
| Dimensions | 21 × 36 × 54cm |
| Weight | 12.5kg |
| Warranty | 2 years |
