Dehumidifier Safety in the Bathroom: To Open or Not to Open the Window?

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Discussion Overview

The discussion revolves around the safety and effectiveness of using a dehumidifier in a bathroom, particularly the implications of keeping windows open or closed while operating the device. Participants explore the physics of humidity control, energy consumption, and safety concerns in the context of drying clothes and maintaining a comfortable environment.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants suggest that keeping windows closed allows the dehumidifier to effectively manage humidity within the bathroom, rather than attempting to dehumidify the outside air.
  • Others argue that if the absolute humidity of the outside air is lower than that in the bathroom, opening the windows could be beneficial by providing additional moisture sinks.
  • One participant notes that the dehumidifier has a limited capacity to remove humidity from a confined space and that external sources of humidity could hinder its effectiveness.
  • Concerns about energy consumption are raised, with suggestions that using a fan might be a more efficient alternative when outside humidity is low.
  • A participant mentions the potential safety hazards of using a powerful electric appliance in a bathroom, recommending precautions such as using a residual current device (RCD) for safety.
  • Another participant shares their experience of using a dehumidifier that also heats the room, noting seasonal effectiveness and suggesting alternatives like air-conditioning units for summer use.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the effectiveness of keeping windows open versus closed while using a dehumidifier. The discussion remains unresolved, with no consensus on the best approach or the safety implications of using the device in a bathroom setting.

Contextual Notes

Participants highlight the dependence on local humidity conditions and the limitations of the dehumidifier's capacity. Safety concerns regarding electrical appliances in wet environments are also noted but not universally agreed upon.

addorian85
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TL;DR
dehumidifier debate around open window
Hello, I have a dehumidifier and I keep it in the bathroom (small bathroom), where I can dry my clothes. It has a fast dehumidifying feature for drying clothes and it's working very well in my opinion. I was always bad at physics but I have read on the internet, in the manual that I should keep the windows closed, or if open, turn off the machine. Now, I have a debate, someone telling me that what I say and what is written in the manual is bull*(^. What is the physics behind it? Which statement is true? Thank you!
 
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addorian85 said:
Summary: dehumidifier debate around open window

Hello, I have a dehumidifier and I keep it in the bathroom (small bathroom), where I can dry my clothes. It has a fast dehumidifying feature for drying clothes and it's working very well in my opinion. I was always bad at physics but I have read on the internet, in the manual that I should keep the windows closed, or if open, turn off the machine. Now, I have a debate, someone telling me that what I say and what is written in the manual is bull*(^. What is the physics behind it? Which statement is true? Thank you!
Isn't it simply that you want to dehumidify the bathroom, not the whole outdoors?
 
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Welcome!
Your machine can only remove certain amount of humidity from a limited volume of air.
Open doors means that your machine is trying to remove humidity from the whole atmosphere, which may take a long time, and only if other sources (like lakes and rivers and oceans and sweating people, transpiring trees, etc.) stop adding humidity into it.
 
The clothing is putting moisture into the air. The dehumidifier is removing it. With the windows closed, there will be a (possibly slowly declining) equilibrium humidity.

If the absolute humidity of the outside air is less than the equilibrium humidity in the bathroom then it could be advantageous to open the windows and have two moisture sinks instead of just one.
 
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addorian85 said:
Now, I have a debate, someone telling me that what I say and what is written in the manual is bull*(^. What is the physics behind it? Which statement is true?

jbriggs444 said:
If the absolute humidity of the outside air is less than the equilibrium humidity in the bathroom then it could be advantageous to open the windows and have two moisture sinks instead of just one.
This. It really depends on whether where you live is humid or dry. If the humidity is low where you live, opening the window can help. On the other hand, if humidity is high, then opening the window will make it that much harder for the dehumidifier to suck the moisture from the air, as several people have already mentioned.
 
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addorian85 said:
Summary: dehumidifier debate around open window

It has a fast dehumidifying feature for drying clothes and it's working very well in my opinion.
Total energy consumption (=$$$£££) should always be considered these days. A dehumidifier is quite energy hungry and it's a good idea to get the best value from it. A simple fan, directed at the clothes will increase the humidity in the room so the dehumidifier may produce better results in a given time. Also, if your outside humidity is low, try to do without the dehumidifier unit and, instead, use a fan (extractor or at least directed at the window) to increase through flow of air in the room.
 
I also have one in a bathroom but it also heats the room somewhat. That works out great in winter but not so much in summer. A better option for summer might have been a small window air-conditioning unit which would dehumidify the air but dump the heat and water outside as well as cool the room.
 
anorlunda said:
Isn't it simply that you want to dehumidify the bathroom, not the whole outdoors?
That's a nice one - and perfectly correct, at that!
 
IMHO, a powerful electric appliance in bathroom is NOT a good idea due to splash / corrosion / shock-hazard.

If you truly have no alternative, treat location as 'garden', the appliance as eg corded lawn-mower and run via a 'Push-to-Test' RCB adapter. Safety whatsit trips at 30mA, before any potentially lethal zap can bite...
 

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