This Miraco 500 Watt Heater Kit is designed specifically for Miraco livestock watering tanks. The watering tanks are designed for this heater to set about a half inch above the bottom which makes for better, more efficient heat dispersion. Built out of Teflon coated aluminum and featuring a High Limit safety fuse, it has new built-in thermostat technology for more effective operation.Compatible with Miraco water tanks model A3500 Lil' Spring Square, A6000 BigSpring, A6100 BigSPring II, A6200 BigSpring 7', A6300 BigSpring 10', A6400 BigSpring 12'.