Honeywell Germ Free HCM-350 Humidifier, $122.04, Overstock.ca Made in Germany, this boxy humidifier and air purifier combo doesn't require a replacement filter and comes with a 10-year warranty.

What we dislike: The proprietary filters are pricey to replace, and the unit’s lights are too bright for some consumers. Best bang for your buck humidifier for hard water ...

Evaporative humidifiers: This type of humidifier, which includes the HCM-350, wicks water through a filter then uses a fan to blow air across the filter where it absorbs moisture as it passes.