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The nipples must be mounted facing down (vertical), if they are horizontal, they will leak.
GOOD NEWS THOUGH!!!
Here is our solution to the very same problem.
We built an insulated box and put a spray tank in it, but a 55 gallon drum or two would work also...
Inside the tank, there is a stock tank heater, and a submersible pump.
the garden hose from the pump runs up to the ceiling, through the wall and down into the nipple waterers in the coop. (our coop is the old tack room of our barn). The waterer has a bird bath de-icer in it to keep it from freezing, and the hose gravity drains so it wont freeze either.
Ok, now this is the really cool part... 130 gallons of storage, we have 26 birds, they drink about 2 gallons a day, I only have to fill the tank once a month at the MOST!!!
now for the really REALLY cool part, the outlet for the pump is on a light switch, so all my darling wife has to do to fill the waterer is, YAWN, flip a switch...
NOW HOW COOL IS THAT!!!
You don't need the box, but we got 'damaged' 2" rigid insulation panels for $5 bucks each. they will pay for them selves. you dont even need the osb on the outside, but the mice here would dismantle it in a matter of days if we didn't. heck you could use old blankets. You don't need a real expensive submersible pump either, just something to lift 2 gallons of water, once a day.
you may notice a grocery bag on top of the water tank, that is a bag of potatoes. The box provides constant 40* cold storage all winter long. Pretty neat huh???