The TropiCal is the best economical choice in heat pumps today. This compact unit is perfect for above-ground pools and small in-ground pools. Each TropiCal Heat Pump includes a ThermoLink Titanium heat exchanger with patented counter-flow water management for superior efficiency with a powerful sealed ventilator motor. A vinyl coated evaporator coil and fan grill with a microprocessor controlled automatic defrost protect your investment promoting an effortless swimming season. 208-230 Voltage.