Mount the Ritchie Water Heater directly under the trough for reliable performance throughout the winter, even in the most extreme winter conditions. For the use in the following units: Omni 1, Omni 2, Stall Fount 125, Stall Fount II 125, Pork King Series, EcoFount 1 and EcoFount 2. | Ritchie Waterers 125W Water Heater