It's usually the tiny aperture between barrel and cup that will freeze.
Can't quite tell how those work tho, wish I had my hands on one ,
where the valve seal is is key.
Horizontal Nipple work best in a heated water scenario as they seal with a rubber Oring inside the vessel.
I use a 5 gallon bucket with nipples attached to the bottom....and a 3 gallon tray waterer. The nipple waterer is plain water and inside the coop. The tray waterer is in the run and has ACV and Minced garlic in it.....always. The birds enjoy both anf regularly drink from both. Been offering the ACV since they were 2 wks old.garlic at 4 wks they actually pull the garlic out of the water to eat. I also use garlic powder occasionally on their feed and cayenne once in a while....a small amnt mixed in well.
I have two watering stations, each with a 5-gal bucket and several nipples on the bottom. I installed a toilet bowl float in each and hooked it up to water supply pipes that go around the perimeter of my back yard. I never have to actually fill the buckets, only check to see that they're full and not leaking/running constantly.