Driftless SW Wisconsin | I also replaced the brass valve and ball float in the petersen with a plastic Mirafount valve and a pancake styrofoam float when I first installed it to get a faster fill. I think petersen offers either the brass or plastic float. My petersen has the black lid as shown in my link. My Bohlmann has the metal lid. Never had a problem with either of them freezing up, even at 10-15 degrees F below zero. I think they used to offer 2 different wattage heaters. Maybe you got the small one?
 (IMG 015 Some winter afternoon pics at -5F 011716 Petersen waterer ice free.jpg)
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 IMG 015 Some winter afternoon pics at -5F 011716 Petersen waterer ice free.jpg (90KB - 168 downloads)
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Which automatic cattle waterer?
