DEHUMIDIFIER SIZE GUIDE
Choose between our 30L, 50L and 70L commercial dehumidifiers based on how wet the space is, how the rooms connect and where the collected water will go.
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These are practical starting points, not fixed room-size limits. A small soaked room may need more drying capacity than a larger room with light condensation.
Everyday damp and smaller drying jobs
Best for condensation, excess humidity and localised damp after the source has been fixed. Uses a 7L tank or optional gravity drainage.
Leaks and renovation drying
A strong choice for wetter walls or flooring after a repaired leak, or an affected area that needs more capacity. Includes a removable 7L tank.
Heavy drying with pumped drainage
For substantial moisture loads, larger connected areas or demanding flood drying after standing water has been removed. Requires a suitable drain.
The number describes the machine’s rated water extraction over 24 hours. For these models, that rating is measured at 30°C and 80% relative humidity. A cooler or drier room will usually produce less water.
Collecting less than the headline figure does not, on its own, mean the machine is underperforming. The real drying rate depends on temperature, airflow and how readily moisture can leave the materials.
IMPORTANT DISTINCTION
Tank size is separate
The 30L and 50L both have a 7L removable tank. The 70L has no tank: its built-in pump sends collected water through a hose to a suitable drain.
The right machine depends on the job around it. These four details make the biggest difference to a practical setup.
Straight answers to the questions that matter most when choosing a commercial dehumidifier.
Will a bigger dehumidifier always dry things faster?
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More capacity can help with a heavy moisture load, but drying also depends on airflow and how readily water can leave the materials. Moisture beneath floors or inside cavities may need specialist drying rather than simply a larger machine.
Can I use a dehumidifier after flooding?
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Yes, once standing water has been removed and the area is safe for electrical equipment. The 70L pump only removes water collected by the dehumidifier; it does not pump floodwater from the floor.
How long will I need to hire it for?
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It depends on how much moisture is present and where it has soaked in. Check progress during the hire and use material moisture readings after significant water damage rather than relying only on a dry-looking surface.
Which size is cheapest to run?
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Compare hire price and electricity use over the whole job. A lower-power machine can cost less per hour but may need longer. Multiply the machine’s power in kilowatts by operating hours and your electricity price per kWh for a simple estimate.
What size dehumidifier do I need for my room?
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Room dimensions are a useful starting point, but floor area alone is not enough. Tell us what caused the moisture, what is wet and whether other rooms are affected so we can help you choose a practical setup.
Tell us what you’re drying, the affected area, whether you have a drain nearby and if access is difficult. A few photos can help us recommend a practical setup.