I finally bought one the other day the classic basket style with criss-cross top. I thought the water would simmer, but not boil, because I have always kept a pot of water on top of my kerosene stove and that water was always just below the point of boiling. But the water in my ceramic humidifier does come close to simmering and I only get noticable steam from where the water makes contact with the hotter sides of the humidifier. That is where the majority of my evaporation is coming from. I put a thermometer in there and it goes no higher than 150. I don't think I'm getting any appreciable humidity put into the room. My stove thermometer is reading about 500. I have now put a regular steel pot of water down next to the ceramic humidifier to see if there if a difference. One would think a 500 degree stove top would heat the ceramic humidifier somewhere close to 500, but I can literally rest my hand on top of the humidifier and keep it there.