How much water should a dehumidifier collect in a day?


When deciding on the best dehumidifier to buy, it’s a good idea to think about how much water should a dehumidifier collect in a day. This will help you work out whether the dehumidifier you’re thinking of purchasing will be the right one for the area you’re going to dehumidify.

And if you’ve already bought a dehumidifier but you’re not sure if it’s working properly, knowing how much water a dehumidifier should collect in a day is helpful.

In this article, we look at the different factors to think about when it comes to dehumidifiers and how much water they collect, and what can influence the water capacity and amount of moisture that is removed from the air in a room.

How much water should a dehumidifier collect in a day?

A dehumidifier can collect up to 70 pints of water in a day, which is equal to 1.3 gallons or 5.9 liters.

How fast should my dehumidifier fill up?

A dehumidifier can fill up in about 6 to 7 hours if it has a 2 liter water tank, or in about 12 hours if the tank holds around 5.9 liters.

This depends on the size of the room and the desired humidity level as well as the temperature of the room.

Here is a table that outlines how long it takes to dehumidify a 50 square foot room at a temperature of around 80 degrees Fahrenheit, for a humidity range of 30% to 70%:

Dehumidifier Capacity30-70%
30 Pint45 mins
50 Pint24 mins
70 Pint13 mins

There are factors that play a role in how quickly a dehumidifier fills up and how much water it can collect in a day. Let’s explore these in more detail.

How a dehumidifier works

A dehumidifier is used to remove the moisture in the air in a room or space, to bring down the humidity level to an optimal range. This helps with preventing mold, mildew, allergies, asthma, colds and other issues that arise when the moisture level in a room is too high.

The dehumidifier turns air vapor into water droplets using the condensation process, and stores the water droplets in a water tank, ready for you to empty or for your drain hose to continuously empty throughout the day.

When working out how much water a dehumidifier should collect in a day, there are three main points to consider- how much moisture is in the air, your dehumidifier’s water tank capacity and how powerful your dehumidifier is.

How many pints of water a dehumidifier can remove

Shopping for a dehumidifier, you may have noticed that they are advertised in terms of how many pints of water they can remove from the air in a day. Dehumidifiers are usually advertised as either 30, 50 or 70 pint dehumidifiers.

A 70 pint dehumidifier means that the dehumidifier can remove up to 70 pints of water from the air in a room in 24 hours. 70 pints is approximately 39 liters. To convert the pints into liters, divide the pints by 1.76.

A 30 pint dehumidifier means that the dehumidifier can remove up to 30 pints of water in a day, which equates to around 17 liters.

A 50 pint dehumidifier means that the dehumidifier can remove up to 50 pints of water in a day, which equates to around 28 liters.

Water tank capacity of a dehumidifier

The amount of water that a dehumidifier can remove is only one part of the equation. Even though a dehumidifier can remove a certain amount of moisture in one day, how much the actual water tank in the dehumidifier can hold is a different story.

The water tank inside a dehumidifier can hold anywhere from 1.5 liters of water (around 0.32 gallons) to 5.9 liters of water (around 1.3 gallons).

If we look at the capacity of the water tank and compare this with how many pints or liters of water a dehumidifier can remove in a day, it’s easy to see that the water tank may need to be emptied during the day, or a continuous drain hose attached to the dehumidifier so that the process is done for you.

But, there are still other things to consider!

Temperature, humidity level, room size and dehumidifier power

The temperature in a room, humidity level, room size and the power of the dehumidifier also play an important role in determining how much water a dehumidifier should collect.

The warmer the air in a room, the higher the moisture level, and if a dehumidifier is used, the more moisture it removes than if it was being used in a room with a lower temperature and humidity level.

If you live in a tropical and humid location such as Florida, your moisture levels are higher and your dehumidifier will collect more moisture than if you were living in New York City.

The ideal humidity level should be between 30% and 50%, however it’s normal to have a higher humidity level in bathrooms and kitchens. Anywhere up to 70% can still be ok.

You’ll find that a bathroom dehumidifier may collect more water than a dehumidifier used in a living room, for example, because a bathroom is more damp and has a higher humidity level than a living room.

And if you have a large family and your bathroom is often used (especially if you have teenagers!), then your bathroom dehumidifier could be working in overdrive.

Finally, we should also consider the power of the dehumidifier. A small dehumidifier would have a smaller tank capacity and would not have as much power as a large dehumidifier. For a bathroom or ensuite, a small dehumidifier could be suitable. But if the room is large or the humidity level is high, then a larger dehumidifier may be more appropriate.

Some dehumidifiers have more than one power setting- if you use a lower power setting, then the dehumidifier will collect less water in a day than if you had the dehumidifier operating at a high power setting.

One final word

How much water should a dehumidifier collect in a day? Knowing this will help you decide which dehumidifier to buy and if you’ve already bought one, you will know if it is working properly or not.

The dehumidifier’s water tank capacity, power, current and desired humidity level and room temperature all impact how much water is collected in a day.

Even though these variables all play a role, looking at a dehumidifier’s power capacity and its water tank capacity is a good start.

By Christine Carlisle

Christine is a freelance senior writer for Home Health Living and has been writing for us for 4 years. She's a health copywriter with over 10 years experience as a writer. Christine lives alone in a cabin in Maine and was once a hand model while living in New York City. She's a dog person.