

20L Dehumidifier for Home and Basement
A 20 L/day dehumidifier with 3 modes, 3-colour indicator and a 24-hour timer for homes and basements up to 25 m².
● In stock
Free delivery · 2–4 working days
Free to UK mainland (DHL/DX/DPD), in-stock items ship within 24h. Excludes Channel Islands, Isle of Man, Scilly Isles & Scottish Islands; a surcharge may apply to some remote areas.
30-day returns
Change your mind within 30 days. Sold & shipped via Costway.
Manufacturer warranty included
Covered against manufacturing defects. Real UK aftercare.
This Costway 20L/day dehumidifier UK buy is a versatile pick for homes and basements up to 25m², covering damp bedrooms, lounges, utility rooms and cellars. It removes up to 20 litres of moisture a day (at 30°C, 80% RH), enough to clear condensation, dry laundry and keep black mould in check in mid-sized rooms. At a quiet 41dB it's comfortable to leave running in a bedroom, and a sleep mode keeps it discreet overnight. Three modes – continuous drying, auto and sleep – let you match the job, while a clear front LED display and 3-colour humidity indicator show conditions at a glance. As a compressor model it runs economically, typically only a few pence per hour at 26p/kWh on lower settings. The 4L tank can be emptied by hand, or you can connect the included 1m hose for continuous drainage; when the tank fills, an alarm sounds and the unit shuts off automatically to prevent overflow. A 24-hour timer schedules operation, and at 12kg it's easy to reposition. In the box: the dehumidifier, drain hose and instruction manual. Best results come in warmer, humid conditions rather than unheated outbuildings.
Highlights
- Removes up to 20 L of moisture per day
- Covers spaces up to 25 m²
- 3 modes: continuous, auto and sleep
- LED display and 3-colour humidity indicator
- 24-hour timer and quiet operation
- Manual and continuous drainage with auto shut-off
Description
This Costway 20 L dehumidifier manages humidity in spaces up to 25 m², making it a solid choice for homes and basements. It removes up to 20 litres of moisture per day (at 30°C, 80% RH) and offers three modes — continuous drying, auto and sleep — for customised comfort.
A clear front LED display and 3-colour humidity indicator let you check conditions at a glance, while the 24-hour timer schedules operation and quiet running keeps things peaceful.
Two drainage options are available: manual tank emptying or continuous drainage via the included hose. When the tank fills, an alarm sounds and the unit shuts off automatically.
What's in the box
- Dehumidifier
- Drain hose
- Instruction manual
Specifications
- Dehumidification
- 20 L/day (30°C, 80% RH); 10 L/day (27°C, 60% RH)
- Coverage area
- 25 m²
- Power source
- 220-240V / 50Hz
- Water tank
- 4 L
- Humidity range
- 30% - 80%
- Drain hose length
- 1 m
- Power cord length
- 150 cm
- Noise level
- 41 dB
- Net weight
- 12 kg
- Dimensions
- 30 x 23 x 49 cm (L x W x H)
Ideal for
20L Dehumidifier for Home and Basement — FAQs
What size space does the 20L Dehumidifier cover?
It's rated for homes and basements up to 25m², suiting mid-sized bedrooms, lounges, utility rooms and small cellars.
Is the 20L Dehumidifier quiet enough for a bedroom?
Yes. It runs at 41dB with a sleep mode, making it quiet enough to leave on overnight in a bedroom.
What happens when the tank is full?
When the 4L tank fills, an alarm sounds and the unit shuts off automatically to prevent overflow. You can also fit the included 1m hose for continuous drainage.
Should I leave the 20L Dehumidifier on all night?
You can. Use sleep mode and the 24-hour timer, and either empty the tank beforehand or connect the hose for continuous drainage so it runs uninterrupted.
Does it help with damp and mould in a basement?
Yes. By extracting up to 20L/day and lowering relative humidity, it helps dry damp basements and discourage black mould.
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