Galeann
Songster
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I am sorry. There was miscommunication here. What I am saying is that if you have a heated container, vertical nipples will freeze much faster than horizontal nipples. I am not saying horizontal nipples do not need a heated container. Horizontal nipples would not keep the container of water itself from freezing. Both types of nipples need heated containers when the temperatures are below freezing.
Vertical nipples have a little bit of water in them even when they are not being used. That little bit of water hanging down below the bucket is susceptible to freezing. On the other hand, horizontal nipples have an o ring that keeps water out of the nipple when not in use. Vertical nipples used in a heated container are good choices for those who live in areas that get cold, but not bitterly cold. Where I live -22 F is a normal low for winter. Vertical nipples would freeze at that temperature whereas horizontal nipples do not.
Thank you for the education. I did not know about the o ring.