I live in Minnesota and the water in my chicken coop keeps freezing. Have no heat in the coop only on a heat lamp that is only on 3 hours a day at night. We have a heater in the water but it still freezes around the heater (when we put it in the main part it freezes around it not the donut)(we don't have a electricity in the coop just an extension cord coming from the house) I don't know if its the heater that it cant keep up or if its just not working all the time.This is the waterer we have. the big problem is if we put the heater in the main part then the donut freezes and then if you put it in the donut then the main part freeze. any advice on how to fix this problem.