Honeywell 20L/Day Review UK 2026
Quick verdict
Score: 6.9/10
Best for: Tackling damp, condensation and drying laundry around the home
Not for: Cold, unheated spaces below about 15°C, where a desiccant model copes better
Bottom line: A practical dehumidifier (20 litres/day, 3.4L tank) for keeping humidity down and preventing mould and condensation.
Overall, the Honeywell 20L/day dehumidifier is designed for home use where moisture control matters. It is rated for extracting 20 litres of water per day and includes a 3.4L water tank for collected water. It suits damp rooms and for drying clothes, since it can help reduce humidity. The 3.4L tank capacity means it will need emptying before it fills, and power use, noise, and performance limits are not stated, so expectations should be kept cautious.
Key specifications
| Spec | Value Notes |
|---|---|
| Capacity | 20 L/day From title |
| Tank size | 3.4 L From title |
| Timer | 24 hour From title |
Pros
- Removes up to 20 litres/day
- 3.4L tank
Cons
- The water tank needs regular emptying unless you plumb in the drainage hose
- Running it adds to electricity use, so a humidistat or timer helps keep costs down
- Compressor models are less effective in cold rooms below about 15°C
Extraction Rate and Performance
How well this dehumidifier unit performs in real wet-room conditions is centred on its extraction rate of 20 litres per day, which indicates the amount of moisture it is designed to remove under stated capacity conditions. In use, extraction rate can vary because humidity levels and airflow can change day to day. Wet-room walls can also release moisture more slowly after drying. The 3.4L tank collects condensate until it needs emptying, so continuous use can require frequent emptying. Stable performance is most likely when the room remains consistently humid and the unit runs on schedule.
Room Size and Coverage
Room size and coverage depend largely on how much dampness is being produced in the space. The Honeywell's 20L/day capacity indicates it is intended for fairly damp homes where moisture builds up from everyday use. For best results, run it in the room that needs drying, since dehumidifiers draw moisture from the air within the spaces they can access. In larger open-plan areas, coverage may feel uneven, so relocating the unit or using it in key zones can help. Assess the impact by monitoring how quickly the air feels drier, rather than assuming performance remains the same across all rooms.
Tank Capacity and Drainage
A 3.4L tank helps the dehumidifier/day dehumidifier manage everyday moisture without needing constant attention, but it also sets a clear limit on how long it can run before the tank fills. With a rated collection of 20 litres per day, the tank capacity is 3.4 litres, so draining may be needed when damp levels are high. This means monitoring the tank during longer drying sessions and emptying it promptly to keep performance steady. If the tank is full, collection must stop until the water is removed, which can interrupt drying schedules.
Noise Level
Noise level matters because a damp dehumidifier can run for hours, especially when drying clothes, and the sound it makes can affect sleep, work, or quiet time. The company's listing does not specify a decibel (dB) rating, so exact loudness is not verifiable from the product title. In use, the device's operation will be continuous as moisture is removed, and that steady cycling may be noticeable in bedrooms or living rooms. Users may prefer placing it in a utility area, or using a 24Hr Timer, if available.
Energy Use and Running Costs
Energy Use and Running Costs depend on how long the dehumidifier runs. Since the earlier noise point shows it can be noticeable during extended use, such as drying clothes, electricity cost is tied to daily run time rather than to any single sound-related factor. The Honeywell's 20L/Day output targets moisture removal for home use, so heavy damp conditions may lead to longer operation and therefore higher bills. With a 3.4L water tank, frequent stops for emptying can slightly disrupt continuous drying. Buyers should plan for typical household schedules, because cost rises mainly with runtime.
Modes and Controls
The dehumidifier's 20L/day dehumidifier is designed for everyday home humidity control, with modes and controls focused on simple operation for tasks such as drying clothes. A digital display helps monitor settings. The unit includes a 24-hour timer, enabling it to be set before work or overnight and then switched off automatically. A washable dust filter supports routine cleaning, which may help maintain airflow consistency. The 3.4L water tank requires regular emptying as it fills, and if humidity remains high, repeated cycles may be needed. Overall, the controls support straightforward use.
Compressor or Desiccant
Choosing between a compressor-type and a desiccant-type dehumidifier changes how the unit removes dampness. A compressor unit works by cooling air so water condenses, then collecting it in a tank such as the 3.4L capacity noted for the Honeywell 20L/Day. A desiccant unit absorbs moisture, which can help in colder or less stable rooms, though it may need more frequent recovery. For drying clothes and typical home wet conditions, compressor models usually feel steady, whereas desiccant models can suit edge cases.
Who Is This Dehumidifier For?
Who is this dehumidifier most suitable for? It fits households that regularly battle damp air, especially when drying clothes, because the unit is rated to remove up to 20 litres per day and includes a 3.4L water tank. It also suits people who want a simple, controlled routine, with a digital display and a 24-hour timer for scheduling. However, with a 3.4L tank capacity, more frequent checks are needed if humidity is high. It can also be used for general home drying, with washable dust filtration helping maintain airflow.
Where to Buy in the UK
Buyers typically check major UK retailers such as Amazon UK, John Lewis, Currys, AO and Argos, then compare the listing accuracy and included parts before checkout. They should verify that the product title matches the exact bundle and specifications, since pricing and included items can vary, and warranty terms are often not set out in detail online. For certainty, shoppers can read the returns policy, confirm delivery locations, and then look for clear instructions on filter washing. If key information is missing from the listing, they should contact the seller before purchasing.
Frequently Asked Questions
Is the Honeywell/Day worth it?
If you have damp, condensation on windows, or laundry that will not dry, the dehumidifier/Day earns its place by pulling moisture out of the air at up to 20 litres/day. It tackles the cause of mould and musty smells rather than masking them - check the current Amazon UK price, as it changes often.
Is the Honeywell/Day powerful enough for my home?
The dehumidifier/Day is rated to remove up to 20 litres/day. The headline figure is measured in warm, very humid lab conditions, so real-world extraction is usually lower - size up if your problem is severe.
What does this dehumidifier/Day cost to run?
Running cost depends on its wattage, how long it runs and your electricity tariff, so it is best checked against the stated power rating rather than a fixed figure. Using it on a timer or with a humidistat keeps running costs down.
Is the Honeywell/Day a compressor or desiccant dehumidifier?
Compressor models are most efficient in heated rooms; desiccant models cope better in cold spaces like garages. Check which type this is before buying for an unheated area.
How often do you empty the Honeywell 20L/Day?
The dehumidifier/Day has a 3.4L tank, so how often you empty it depends on how damp the air is. For continuous running, look for a model with a drainage hose option.
Will this dehumidifier/Day stop damp and mould?
By holding the room's humidity down, the Honeywell/Day removes the moisture that mould and dust mites need, which helps prevent condensation on windows and musty smells. Existing mould should still be cleaned off; the dehumidifier stops it coming back.