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What is Dehumidifier Size / capacity ?
When people talk about a dehumidifier’s size, they usually don’t mean its physical dimensions. Instead,
the size or capacity is how many litres of water it’s able to extract per day. In practice, larger
capacity models tend to be physically bigger too, but this isn’t always the case.
Capacity is not the same as the water tank size. This is listed separately by manufacturers and is usually
between 2-6 litres. As you’ll notice, most machines have a tank that’s considerably smaller than the
daily capacity. This doesn’t mean you’ll need to empty it multiple times per day though, as it’s rare for a
dehumidifier to extract its full capacity each day (extraction varies depending on temperature and
How to Choose a Size
Every brand provides a capacity for their machines. This is a useful figure for comparing machines, but is
usually the maximum extraction in ideal conditions.
If you go to a manufacturer’s website, they often provide the humidity and temperature the capacity
was measured at.
In reality, a dehumidifier will rarely reach these numbers, so it’s not the only factor affecting a machine’s
extraction effectiveness. This is because extraction varies greatly depending on the temperature and
humidity of the air.
That doesn’t mean capacity should be ignored though. As a general rule, bigger capacity dehumidifiers
can deal with larger spaces and higher levels of moisture.
A low capacity model that can manage humidity in a small room with mild damp may struggle with
multiple rooms. And if you want a whole house dehumidifier, it’s essential to choose one with a large
To clarify this further, there are three main considerations when choosing a dehumidifier size:
1. The size of the environment you want to dehumidify. This should be measured in square
metres or in cubic metes as that’s the unit quoted by manufacturers.
2. The level of moisture in the environment. This is a more subjective measure, unless you
use a humidity monitor. But you should have an idea of how damp a space is by noticing where
moisture is accumulating.
3. The temperature of the environment
It’s probably obvious that the larger the room(s), the greater capacity you’ll need. Rooms with severe
damp problems also require larger capacities. Signs of severe damp include stains on walls,
condensations on walls and, in the worst cases, wet floors.