You are lucky! I tried to switch to a heated waterer with the horizontal nipples when it got to 10F here, and my dumb chickens couldn't figure out how to use it after 3 days, no matter what I tried. I almost lost them in the process.
@Huntsville Saloon
This is one of the reasons I don't use the horizontal nipples. There are just some birds that don't learn and I don't want to guess.