Just checked girls about the time you where typing. The 3 lower nipples where froze up. Upper ones all worked great! Move them up 2 or 3 inches and skip the insulation for now!
FYI 4f here today
Thanks for the update! We'll try moving the nipples up in the next few days (need to buy more & a new bucket) and see what works. We're trying the oil in the meantime and will post results.
Really...you have a thermometer in the bucket?
What are your ambient temps?
Not sure oil will work-never heard that one before, but it might, look forward to hearing results.
Oh and Welcome to BYC!
Thanks @aart. We basically built our coop based on this site. Love it! I have a zigbee temp sensor that reports to SmartThings so we can monitor the water temp

Ambient has been around 10-15 degrees in the daytime, and +/- single digits at night.
My secondary concern is that we've had two 250 watt K&H Pet Products Ultimate Pail Deicers that send the temp as high as 110 degrees before turning off. Haven't figured that out yet, but seems like a huge waste of energy (unless its keeping the nipples from freezing!).
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