On your waterers:
-What size/type are they that the bulbs keep them thawed?
-On your Ceramic heaters - I have one but have never used it. Purchased it for brooding but that was a bad idea for various reasons. So - if I used if like you are, how do you keep the chickens from touching it and getting burned? (Very hot, they are! And no glow to warn.)
60 watts are my usual choice.
This is my 60 watt ceramic bulb.
I use a dome shield made for the 250 watt bulb. I can feel the heat coming off it before my hand gets near. I don't hang it close to anything combustible or low enough where chicks could reach it. I only use it with newly hatched or on the coldest days of winter.
This was purchased at a pet store in the reptile section. It puts out a lot of heat.