Abstract: A heated water vessel for providing drinking water for animals is provided which has a first exterior rubber container and a second rubber interior container wherein the second container is nested within the first, forming an enclosed air pocket between the first and second container. The two containers are sealed together with a breakable adhesive in order to allow the separation of the containers if necessary. An electric self-regulating heating cable is wrapped around the outer surface of the second container and in contact therewith in order to prevent the water within the inner container from freezing over during subfreezing temperatures. The enclosed air pocket does not contain any foamed or other type of insulation.