Abstract: A heating apparatus according to the present disclosure maintains the temperature of water in a trough. The heating apparatus comprises a body configured to be submerged in the trough, the body having a pump and a heating element affixed in the body, the pump configured to draw water into an intake port at a first end of the body past the heating element to heat the water and return the water through an outlet port at a second end of the body; a sensor monitoring the temperature of the water in the trough; and a control module. The control module is configured to activate either the pump or the heating element when the temperature of the water is less than a predetermined low temperature. The control module is configured to deactivate the pump or the heating element when the temperature of the water is greater than a predetermined high temperature.