What Water is Best for Your Humidifier? A Guide to Evaporative vs. Ultrasonic Models

Before diving into the water types, let’s quickly go over the differences between evaporative and ultrasonic humidifiers: 

• Evaporative Humidifiers: Use a wick filter to absorb water from a tank. A fan then blows air over the wick, causing the water to evaporate naturally into the air. This type of humidifier is self-regulating, meaning that as the humidity in the room rises, the humidifier naturally reduces its output to maintain optimal levels. Evaporative models are best for larger rooms where consistent and adjustable humidity is needed. 

• Ultrasonic Humidifiers: Use high-frequency ultrasonic vibrations to turn water into a fine mist, which is then released into the air. These humidifiers are typically quieter and more energy-efficient compared to evaporative models, making them ideal for smaller rooms or for use in bedrooms. Ultrasonic humidifiers are a good choice for those who want a silent operation while adding moisture to the air quickly. 

The type of water you use affects your humidifier’s performance, maintenance, and longevity. Here’s a quick breakdown of your options: 

Tap water is convenient, widely available, and perfect for evaporative humidifiers since you don't need to buy special water, making refills quick and hassle-free. Unlike ultrasonic humidifiers, evaporative models don’t release minerals into the air, so you won’t have to deal with white dust. However, minerals in tap water can still build up inside the humidifiers over time, still requiring some cleaning. Despite this, the ease of using tap water often outweighs the extra maintenance.  

For ultrasonic humidifiers, tap water is not recommended because it can create white dust due to the minerals being released into the air. Not only will the humidifier and surrounding surfaces require cleaning, but the air will as well. 

Distilled water is free of minerals, making it an ideal choice for reducing mineral buildup in both evaporative and ultrasonic humidifiers. While it’s more expensive than tap water, using distilled water can significantly reduce maintenance.  

For evaporative humidifiers, it helps prevent the clogging of the wick and the buildup of scale inside the unit, ensuring the humidifier runs efficiently for longer periods.  

For ultrasonic humidifiers, distilled water reduces white dust, keeping your air clean and preventing mineral particles from settling on surfaces. Though it costs more upfront, many users find the tradeoff of reduced maintenance and better performance worth it. 

• Regular cleaning: To prevent mineral buildup, clean the water tank and the wick filter regularly. If you're using tap water, weekly cleaning of the water tank is recommended. For distilled water, cleaning every two weeks may suffice. 

• Replacing the wick: Over time, the wick filter may wear out or become clogged with minerals. Replacing it periodically helps maintain optimal performance and ensures your humidifier continues to work effectively. 

• Regular cleaning: Clean the unit and misting components, including the water tank and ultrasonic plate, to prevent mineral buildup and ensure efficient operation. Cleaning should be done at least once a week or more often if needed. 

• Preventing white dust: If you're using tap water, consider switching to distilled or filtered water to reduce white dust. This helps keep your surroundings cleaner and extends the life of your unit. 

The cleaning frequency for your humidifier depends on the type of water you use, as well as the amount of time the humidifier is running. In general: 

• For tap water: You may need to clean your humidifier weekly to remove mineral deposits. 

• For distilled water: Clean your humidifier every two weeks, as there will be less mineral buildup. 

If your humidifier is running constantly, you may need to clean it more frequently. Always follow Levoit's guidelines for specific cleaning recommendations. 

To keep your humidifier running smoothly for years to come, consider the following tips: 

• Use the Right Water: Choosing the right water type can prevent mineral buildup and extend the life of your unit. 

• Store Properly: When not in use, empty the water tank and dry the unit to prevent mold and bacteria growth. 

• Avoid Overuse: Running the humidifier for too long can lead to excess moisture in the room, which can result in mold growth. Use a humidity monitor to ensure the humidity levels remain comfortable (between 40–60%) or use Auto Mode to automatically maintain humidity levels. 

• Use a Humidifier Tray: To reduce mineral buildup in ultrasonic humidifiers, place a tray underneath the unit to catch any excess mist or white dust. This will prevent dust from settling on furniture and surfaces. 

• Change the Filter Regularly: If your humidifier has a filter, remember to replace it as per the user manual. A clogged filter can reduce performance and lead to inefficient operation.
  

The best water for your humidifier depends on the type of unit you have and your maintenance preferences. Tap water is convenient and easy to use, especially for evaporative humidifiers, but it may require more frequent cleaning due to mineral buildup. Distilled water is ideal for reducing maintenance and preventing mineral deposits in both evaporative and ultrasonic humidifiers, though it can be more costly. 

By understanding the differences in water types and following the maintenance tips provided, you can ensure your humidifier operates efficiently, keeps your air clean, and lasts for years to come.