I had to move the pvc water drain line coming from my furnace that goes outside the house because it created a small ice ring and became slippery. I have that line and also a humidfier line that that i had to move indoors. I have them both draining into a bucket that i empty out often. My question: Where does the water from the furnace come from and why does it appear only when the furnace comes on. I know there is a water line tap for the humidifier. I have a TempStar furnace about 3 years old...Thanks and happy 2013.....