Thanks for responding. Do your nipples stay thawed?I have a three gallon bucket with two horizontal nipples. I have a small (I think it's for one gallon) fish tank heater with suction cups placed right I between the nipples. It was doing perfect until it got down to 5F last night (I'm in MT.) The center of the bucket was still thawed, but the top and edges had about 1/2" ice. The nipples themselves were also frozen... So broke the ice and only filled it half full, hoping the tiny heater would keep a smaller amount of water thawed better.
The high today was 16F and it's been fine all day. The low tonight is 3F, so we will see in the morning!
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