How much water should a dehumidifier collect in a day?

All dehumidifiers extract water from the air, but how much should your device be collecting?

The answer depends on several factors such as the air humidity, the size of your machine as well as the size of its water tank, and the setting you use.

This post examines in detail how much water your dehumidifier should be extracting and what you can do to impact the performance.

Let’s get started.

Quantity Of Water Collected In A Day

If we were to look at the average dehumidifier you could expect it to collect roughly between 2 and 5 gallons of water in a day. 

However, there are a few other factors that will affect the quantity of water collected such as the length of time that it is running, as well as when during the day, the weather, the size of the space, and the amount of humidity in the air.

Dehumidifier Size

These can be purchased in a range of sizes to suit the needs of your home or office space. For most homes, one that can remove around 2 gallons of water should be adequate for removing small amounts in a day. For those living in an area of high humidity or a larger space then you may want to look at one that removes closer to 5 gallons of water.


The average humidity level in your home should be between 30-50% according to the Mayo clinic. Meaning that the air in your home holds 30-50% of the maximum moisture it can hold.

Running Time

If you are running your dehumidifier continuously for long periods of time it will affect how much water the unit will collect. There is no real need for your dehumidifier to be running for extended periods of time as it should only really be needed once the humidity level goes over 50%. If the humidity level drops below 30% it can impact your quality of life as it provides the perfect conditions for certain bacteria and mold to grow.

Weather Conditions

Dehumidifiers are designed to be used when the air temperature is warm. If it is cooler then they will collect far less water from the atmosphere than on warmer days.

Required Space 

If you are looking for a dehumidifier for your entire house then they will of course remove far more than one that is designed to be used in a single room. These entire house units are on a much bigger scale and can remove far larger quantities of water from the air than the smaller single-room ones.


How Quickly Should A Dehumidifier Fill UP?

Dehumidifiers will normally start collecting water as soon as they are turned on. However, it can take around 6-7 hours for it to be full.

How Much Water Should My Dehumidifier?

Typically a dehumidifier will collect between 2 – 5 gallons of water a day. This will depend on the humidity level in the air and other factors such as running time, water capacity, and weather.


The average dehumidifier should collect between 2-5 gallons of water in a day but there are a few factors that can affect this quantity. Things such as the water capacity of the unit, the size of the space, weather, humidity level, and running time.