HN's all the way, baby!!
Exceptions: just hatched chicks and for dosing electrolytes during heat waves.
When I switched from open water to HN's, I monitored/measured the water usage for a couple weeks before and for weeks after the switch. They drank the same amount from each, maybe more with the HN's because there's no evaporation with HN's like there probably is with open waterers.
That said, I would not recommend switching to from an open waterer to HN's in extreme weather(hot or cold)...it does take some times for them to 'learn' how to use the nipples, some catch on fast while others can take a week or more to really 'get it'.
I always offer an open waterer late in the day to make sure they get enough water to digest properly before going to roost during the 'training' period.
ETA: HN's are the best for freezing climes:
https://www.backyardchickens.com/articles/aarts-heated-waterer-with-horizontal-nipples.67256/
They can also be put into almost any vessel(bottle) is care is used to install:
https://www.backyardchickens.com/gallery/albums/aarts-small-water-bottles-and-holder.7427546/
Exceptions: just hatched chicks and for dosing electrolytes during heat waves.
When I switched from open water to HN's, I monitored/measured the water usage for a couple weeks before and for weeks after the switch. They drank the same amount from each, maybe more with the HN's because there's no evaporation with HN's like there probably is with open waterers.
That said, I would not recommend switching to from an open waterer to HN's in extreme weather(hot or cold)...it does take some times for them to 'learn' how to use the nipples, some catch on fast while others can take a week or more to really 'get it'.
I always offer an open waterer late in the day to make sure they get enough water to digest properly before going to roost during the 'training' period.
ETA: HN's are the best for freezing climes:
https://www.backyardchickens.com/articles/aarts-heated-waterer-with-horizontal-nipples.67256/
They can also be put into almost any vessel(bottle) is care is used to install:
https://www.backyardchickens.com/gallery/albums/aarts-small-water-bottles-and-holder.7427546/
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