5 Best Dehumidifiers for Cellars (UK 2026)

Why Humidity Control is Crucial for Cellars

Cellars are particularly prone to high humidity levels due to their location below ground. This environment can cause several issues:

• Mould and Mildew Growth: These fungi thrive in damp conditions and can cause health problems as well as damage to stored items.

• Structural Damage: Prolonged exposure to moisture can weaken walls, floors, and foundations.

• Unpleasant Odours: Musty smells often accompany high humidity and can permeate stored items, making them unpleasant to use.

• Pest Infestation: Many pests are attracted to moist environments, leading to further damage and hygiene issues.
• Dehumidifier for Wine Cellar: Wine requires a stable environment to age correctly, with ideal humidity levels between 50-70%. Too much moisture can cause labels to peel and mould to grow, while too little can dry out corks, allowing air to spoil the wine.

What to Look for in a Cellar Dehumidifier

A cellar can be colder and less ventilated than the rest of the house, so choosing by the biggest litres-per-day figure alone can be misleading. Check the temperature range, extraction method and how you will get rid of the collected water before looking at extra features.

Check the Cellar Temperature

This is one of the most important things to get right. Refrigerant dehumidifiers generally work better in warmer rooms and can lose performance as temperatures fall. Desiccant models are better suited to cold spaces, making them worth considering if your cellar remains chilly for much of the year.

Choose the Right Extraction Capacity

Think about the size of the cellar and how damp it actually gets. A small storage cellar with occasional condensation does not necessarily need the same capacity as a large space with persistently high humidity. If the cellar is divided into separate areas, air circulation between them can also affect how well one machine works.

Look for Continuous Drainage

A full water tank can stop the dehumidifier when you need it running most. If there is a suitable drain nearby, a model with continuous drainage lets collected water leave through a hose instead of relying on the internal tank. The hose needs a suitable downhill route for gravity drainage.

Check Humidistat Controls

A built-in humidistat is useful in a cellar because you can set a target humidity rather than leaving the machine running unnecessarily. The dehumidifier can then switch itself on and off as conditions change.

Consider Noise and Running Costs

A cellar used purely for storage gives you more freedom with noise, but a converted cellar, utility room or living space is different. Also check power consumption if the machine will be running for long periods. A cheaper-to-run model is not necessarily the better option if it struggles in the temperature of your cellar.

Where should I place a dehumidifier in a cellar?

Give the unit enough space for air to circulate around it and avoid pushing it tightly against a wall or into a corner. If using continuous drainage, position it where the hose can reach the drain without kinks or an upward section.

What humidity should a cellar be?

There is no single setting that suits every cellar, but keeping relative humidity around 50–60% is a practical target for many storage spaces. A cheap hygrometer can show whether the cellar is actually staying too humid rather than relying on how damp it feels.

Can I leave a dehumidifier running in a cellar overnight?

Many models are designed for extended operation, but check the manufacturer’s instructions before leaving one unattended. Continuous drainage can also be useful if you expect the machine to collect a lot of water.