it blows out cool air instead of hot. it cools the air and humidifies it, but you don't see all of the steam. Its like a swamp cooler. It only needs refilling like once every 4 days and that was being ran all day (not at night)
Sorry I joined late. My collection includes at least 50 plants outside my Wardian Case, and I also water with a 5-gallon bucket. Yes it does spread bugs. But I have a limitation of space and ability to water. I'd bet a combo of Ray's suggestion and mine might work for you. If you are concerned about disease (as you should be) get two Home Depot 5-gallon buckets. Mix up water/fertilizer in one and water over the empty one. That way you won't spread anything.