A livestock water fountain comprises a first water chamber, a water inlet nearthebottom of the first water chamber, and a thermostat in the first water chamberposition abovethe inlet adjacent a preset low-water level in the chamber so as to measurethe temperature ofthe water near the surface of the water. The fountain maybe divided into dualchambers witha wall having a lower passageway for fluid communication which can be pluggedto limitwater to one of the chambers when water consumption decreases in cold weather.
