Made for above-ground pools and smaller in-ground pools, the TropiCal heat pump is an economical and environmentally-friendly way to heat your pool. Using titanium heat exchangers and TropiCal’s patented counter-flow water management system, this pump harnesses the power of its sealed ventilator motor. All models include a fan grill with a micro-processor that controls an automatic defrost for use down to temperatures in the lower 40’s, and a vinyl-coated evaporator coil. The T115 boasts the ThermoLink Titanium Heat Exchanger that uses a patented hydraulic design. The Thermolink’s design improves compatibility with variable and two-speed pumps by adding only 1 PSI at 30 GPM.