I'm new to the game so take it for what it's worth. I have the vertical nipples and have bought the copper inserts for the winter. I've replaced the stainless wight eh copper and am using a heater inside the 4" pvc water tube. So far, so good (unless the water level gets below the heater. ooops!) Just a thought, if ya don't wanna go with the horizontal ones. Floyd T. PS: Does anyone have a link to a vendor selling the horizontal? I am curious to take a look, in case these fail. Thanks.