Using distilled water in a humidifier is highly recommended for optimal performance and air quality. Distilled water is processed to remove nearly all minerals and impurities, preventing mineral buildup inside the machine and stopping the dispersal of fine particles into the air. This choice addresses the primary issues associated with humidifier use.
The Benefits of Using Distilled Water
The most noticeable advantage of using distilled water is the elimination of “white dust” in the room. This fine, powdery residue is composed of dissolved minerals, primarily calcium and magnesium, that are present in tap water. When an ultrasonic humidifier uses high-frequency vibration to create a mist, it aerosolizes these minerals, which then settle on furniture and electronics throughout the room.
The absence of minerals in distilled water also significantly reduces hard water scale, or limescale, from forming inside the unit. This scale buildup can coat the heating element in warm mist humidifiers or the vibrating transducer in ultrasonic models, which reduces the machine’s efficiency and mist output over time. By preventing this accumulation, distilled water helps maintain the humidifier’s performance and extends its operational lifespan.
Furthermore, using demineralized water contributes to cleaner air quality within the home. Eliminating airborne mineral particles is a prudent measure, especially for individuals with respiratory sensitivities. The cleaner water also helps retard the growth of microorganisms, since the minerals in tap water can serve as nutrients for mold and bacteria.
The Risks of Using Tap Water
The primary risk of using untreated tap water is the rapid accumulation of mineral deposits inside the humidifier’s reservoir and working parts. This limescale buildup can clog the machine, leading to reduced mist production and eventually causing the unit to fail prematurely. The crusty deposits also create a rough surface that is more hospitable for the growth of microorganisms, which can then be dispersed into the air along with the water vapor.
Tap water introduces a higher concentration of microorganisms, including bacteria and fungi, which thrive in the warm, moist environment of a humidifier tank. The minerals and impurities in tap water act as a breeding ground, increasing the likelihood of these contaminants becoming aerosolized. Filtered or bottled spring water is not a substitute for distilled water, as these alternatives still contain significant levels of dissolved minerals.
Humidifier Type and Maintenance Considerations
The type of humidifier you own dictates how important the use of distilled water becomes. Distilled water is most beneficial for ultrasonic and warm mist humidifiers because these models directly process the water’s mineral content. Ultrasonic units aerosolize the minerals, while warm mist units boil the water, leaving behind concentrated mineral scale on the heating element.
Evaporative humidifiers use a fan to blow air over a wet wick filter, making them less susceptible to the white dust issue because the filter traps the minerals. Even with these models, using distilled water can extend the life of the wick filter and reduce the frequency of mineral-related maintenance. The cost of purchasing distilled water protects the machine and reduces the need for frequent descaling and filter replacement.
Regardless of the water used, regular cleaning remains a necessary part of humidifier maintenance to prevent the growth of mold and bacteria. Distilled water minimizes mineral buildup but does not eliminate the need to disinfect the tank and base every few days. A common practice is to clean the unit with a vinegar or bleach solution, followed by a thorough rinsing, to ensure that only clean, healthy moisture is being added to the air.