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Here's the waterer heater I built. https://www.backyardchickens.com/web/viewblog.php?id=57188-waterheater We did have to step it up to a 60 watt bulb when nights dropped to the teens here. The terracotta acts as a great insulator, focusing the heat up to the tin pan. We have it on a timer that comes on at 3am and turns off at 7am. We have a 3 gallon plastic waterer (same style as marcym shows) that sits on top.
Here's the waterer heater I built. https://www.backyardchickens.com/web/viewblog.php?id=57188-waterheater We did have to step it up to a 60 watt bulb when nights dropped to the teens here. The terracotta acts as a great insulator, focusing the heat up to the tin pan. We have it on a timer that comes on at 3am and turns off at 7am. We have a 3 gallon plastic waterer (same style as marcym shows) that sits on top.