Spa and Hot Tub Heater, Min. Flow Rate 15 gpm, Inlet Size/Bushing Size 1-1/4 in NPT, Unit-Mounted Thermostat Included, Voltage 240V AC, 1 Phase, Wattage Output 6kW, Amperage 25A, Control Type Mechanical Selector Dial, Overall Length 19 in Immersed,...