WDH-520EB (Akto 521) dehumidifier - the test winner

The Swiss bestseller among dehumidifiers!

For many years, this WDH-520HB (or Akto 521) dehumidifier has been one of the best-selling devices in Switzerland. A multiple test winner, it reliably keeps basements and hobby rooms dry and is a great helper for drying laundry. Now this popular classic is back: completely redesigned and state-of-the-art , it offers the same uncompromising reliability.

Comfortable operation & flexibility

Weighing only 13 kg , equipped with four casters and a convenient carrying handle, this unit is extremely mobile. Regulate humidity in your basement or simply move it to the drying room on laundry day. Thanks to the new digital control, you can intuitively set the target humidity, fan speed, and timer at the touch of a button.

The device operates fully automatically: it only switches on when the air is too humid and pauses completely (including the fan) as soon as the target humidity level is reached. This effectively saves energy.

Environmentally friendly & High-performance

Thanks to state-of-the-art technology and the natural refrigerant R290 , you protect the environment. With a Global Warming Potential (GWP) of only 3, the climate impact has been reduced by 99.85% compared to previous models. Despite its compact design, it reliably dehumidifies rooms up to 50 m² (125 m³) even at a cool 10 °C.

Dehumidification performance at a glance

Approximate daily liter output under various conditions:

Top Features & Benefits

• Automatic function (the device switches off automatically when the target humidity is reached and also switches back on automatically when it gets more humid)
  
• The fan also stops when the target humidity is reached. This saves energy and distinguishes WDH devices from most commercially available devices on the market.
  
• Memory function: Restarts automatically with the same settings after a power outage (SmartHome-enabled via WLAN socket).
• Laundry drying: Significantly speeds up the drying of 1-2 washing machine loads per day.
• Transparent tank: 5-liter condensate tank with water level indicator and auto-stop when full.
• Continuous operation possible: Includes connection for a drain hose (12 mm).
• Antibacterial filter: Washable air filter for clean indoor air.

Technical data