I've had good luck with the traditional Ritchie fountains that use a plug in heater. As Richard showed, there is a sheep/goat fountain that is the best option for most situations. Below is a square cattle fountain that I installed because it suited my particular need, which was to serve 4 paddocks with water with one installation, and to accomodate cattle, horses, and sheep (sometimes up to 500 sheep). You can see by the photo I have a problem in that the 500 watt heater it came with is not good down to 30 below zero. It is not even good down to -10 like it claimed. I solved the problem by adding a 1000 watt heater in the trough. So when temps dip below 0, I plug in the extra heater. I should add that the trough is not frozen solid with the 500 watt heater, so no damage is done.
This trough is too high for small lambs, but I deliberately selected the cattle trough for this reason. If power were to go out for an extended time, there is enough room underneath this trough to use a kerosene heater (looks like the old tin lamp). While the lamp will not keep the trough from freezing, it will protect the inner workings from freeze damage. In addition this trough has a (12 inch?) culvert extending 8 feet into the earth to make use of the earth heat. I have installed a weather proof outlet (in case of a leak water will not spray into the outlet), and have plugged into that a light bulb and heat cable.
The cage to the right is to prevent the rams in the feed yard from jumping the trough to mix with the ewes. Otherwise I have not had any issues with sheep breeching the corner (unless pursued by an youthful border collie).
Since my lambs are not born until May, I do not need a freeze proof water supply for them. Lambs are watered by either rubbermaid tanks or Kane water pans on black plastic pipe.
Incidently... the majority of the winter, most of my sheep eat snow for water. The trough is here for the rams in the feedyard, the horses, and for the times when there is no snow.
Janet
