I have one somewhere. Looking for it now.Do you have a thermometer inside of it to let you know what the actual temperature in there is?
I see that you've had duck's too. I was just in checking on thing's in my brooder. Gave fresh wet feed, and put a small dog food bowl filled with water and sitting in a pie plate in there. Of course the duckling's had to hop right in it, don't you know. It looked like a bowl of duckling soup.
There is no keeping a duck out of water!