The robust Bosch 18 Seer, Single-Phase, 2–3-ton Inverter Heat Pump system utilizes just the right amount of energy to achieve ultimate comfort at maximum efficiency while keeping sound levels to a minimum. Features an inverter driven rotary compressor, high pressure switch and low-pressure transducer and a crankcase heater. Utilizes Intelligent oil return technology. IPM and electronic control board high temperature protection along with compressor high temperature protection. Compressor sound blanket, wire fan discharge grille and steel louver coil guard. 208/230 Volts.