Will a dehumidifier work after being submerged in water?

Author: Norris Lakin  |  Last update: Monday, February 9, 2026

Yes, a dehumidifier works well to dry out a damp area after a flood.

How long to run a dehumidifier after water damage?

Dehumidifiers are essential for maximizing drying effectiveness and reducing damage. However, since every case is unique and depends on several variables, there is no set period for how long you should operate a dehumidifier following a water leak. The suggested usage period, though, is between 24 and 48 hours.

How to use a dehumidifier after flood?

Tips for how to get the best out of a dehumidifier after a flood:
  1. Place the dehumidifier on a level surface.
  2. Drain the water away using a hose, preferably into a sink. ...
  3. Use as little hose as possible and don't leave excess curled up in the sink.

Will a dehumidifier dry up a puddle of water?

Yes – dehumidifiers do work for water leaks by removing excess moisture from the air, but they have limits. They are extremely helpful when you need to dry an area with minor damage. However, it will not help with severe water damage or if you have mold growing.

How to fix a dehumidifier not turning on?

Confirm that the circuit breaker and/or fuse that serves the dehumidifier is not tripped or a fuse is not blown. Confirm that the controls are on the ON position. Verify that the humidistat is set between 50 and 60 percent relative humidity. If the dehumidifier still does not operate call a competent HVAC servicer.

How Long To Run Dehumidifier After Water Leak 💨 | HVAC Training 101

How do I reset my dehumidifier?

If the relative humidity is below or close to the minimum setting than water will not collect in the bucket or drain hose. If the operating conditions and filter have been checked unplug the dehumidifier for 3 minutes and then plug back in. This will reset the device.

How do I know if my dehumidifier is broken?

Signs Of A Broken Dehumidifier
  1. Not Collecting Water. A dehumidifier that's not draining is usually due to one of two reasons related to the drain hose. ...
  2. Leaking Water Onto The Floor. ...
  3. Noisy Or Rattling While On. ...
  4. Staying On Permanently. ...
  5. Collecting Frost. ...
  6. No Longer Turns On Or Does Not Stay On Long.

How to dry out a dehumidifier?

Therefore, the trick is to dry the interior out before storing. Run the dehumidifier on a high fan and select the highest humidity setting possible on your dehumidifier for several hours. The idea is to run the dehumidifier on fan mode only without extracting moisture so that it dries out the internal parts.

Will a dehumidifier dry out a flooded basement?

A: To speed up the drying process in your flooded basement, ensure proper ventilation and air circulation. Move water-damaged items to well-ventilated areas, open doors and windows, and set up fans to promote airflow. Additionally, using a dehumidifier can help reduce humidity levels and expedite the drying process.

How long should a dehumidifier last?

The lifetime of dehumidifiers usually ranges from five to 10 years. To maximize the lifetime, it's important to care for your dehumidifier. Be sure to regularly change the air filters, clean the condensing coils and exhaust grilles, and empty and clean the water bucket.

How to dry out a house after water damage?

Accelerate drying by opening windows and doors. Use fans to move air around the damp walls. Dehumidifiers can help remove moisture from the air, which indirectly removes it from the walls, too. To speed up evaporation, remove molding and baseboards to prevent moisture from entering behind them.

How long does it take for a dehumidifier to dry?

How long does a dehumidifier take to dry clothes? The exact amount of time will vary a lot, depending on factors like how wet your clothes are and how well ventilated the room is. But a rule of thumb, you should expect clothes to dry in around 4-5 hours.

Where should you not use a dehumidifier?

'For the best results, the dehumidifier should always be placed at least 20 centimetres away from every wall,' says Chloe King, Duux brand manager. 'In addition, we advise to place the device away from drafts from doors, windows, and air vents for optimal efficiency.

What should I set my dehumidifier to after a flood?

Place your dehumidifier into the room, close all windows and doors and turn the dehumidifier on to the lowest humidity setting (30% is preferable). If you have any fans, make sure to turn these on too. Air circulating in the room with the dehumidifier running will speed up the drying process.

Why do home dehumidifiers fail so quickly?

You see, incessantly running your dehumidifier can lead to fatigue of its components, causing them to wear out or malfunction over time. It's like running a marathon without any training breaks—you're bound to hit a wall sooner or later.

How long does it take for a flooded house to dry out?

However, on average, a water damaged home may take around 5 days to dry. In other cases, it could take as little as two days, or in more serious situations, it may take a few weeks to fully dry out a home.

How long does it take for a dehumidifier to run after water damage?

Dehumidifier use is recommended for at least 48 hours following a flood or release of water. Also, it's crucial to act promptly, remove any standing water, dry up the area, and, if necessary, contact a reputable water damage restoration company. To stop mold growth, always remember to clean and disinfect all surfaces.

How do you get moisture out of a basement after a flood?

Open all doors and windows to allow the moisture to flow outside. Buy or rent a fan or dehumidifier to speed up the drying process. If you are sensitive to mold or mildew, wear a mask or respirator containing an appropriate filter.

What is the best time of day to run a dehumidifier?

If you're concerned about spending too much on your electricity bill, you can try calling your energy company and asking about the “best times.” Usually, the best times to run your unit, that will save you money, is between 10 pm and 7 am — this is when less people are consuming energy, which drives down the rates.

Will a dehumidifier dry a wet basement?

Although a dehumidifier significantly reduces humidity levels in the basement, it does not address the source of the problem. So, if dampness and floods in your basement are more episodic, like after rain, or if dampness appears along wall and floor cracks, a dehumidifier will not help fix the issue.

How do I get moisture out of my house without a dehumidifier?

Probably one of the fastest and most practical ways to decrease humidity in the house is to open a window. A fresh, dry breeze will quickly absorb moisture in spaces like your bathroom or kitchen. Turn your air conditioner down if you open a window to prevent your unit from working too hard.

Will a dehumidifier dry the whole house?

Humidity level

If the dehumidifier has enough power, it will regulate high humidity in the whole house as long as you keep the doors to all rooms open.

What is the life of a dehumidifier?

How Long Should a Dehumidifier Last? It's typical for a industrial-grade dehumidifier to last between 9 and 11 years. However, with adequate maintenance, an appliance can last even longer.

Should a dehumidifier be left on all the time?

Should a Dehumidifier Run Constantly? No, your dehumidifier should not have to run constantly to regulate the air humidity. An optimal humidity level to shoot for is between 30 and 50 percent. Your dehumidifier should reach this in 8 to 12 hours.

At what temperature does a dehumidifier stop working?

Ordinarily, a Dehumidifier will not operate satisfactorily at temperatures below 41 degrees Fahrenheit or under extremely low humidity conditions. At temperatures below 41 degrees the evaporator coils may freeze. This could make it necessary to defrost the coils as often as once per hour.

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