Aquacal HeatWave SuperQuiet® SQ155AHDSBTK Heat Pump 60 Hz 1-Phase. All AquaCal units feature ThermoLink® Titanium Heat Exchangers and Scroll compressors. Our patented technology allows us to build the most durable and most cost efficient heat pump... ever! AquaCal Heat Pumps are available in a variety of sizes with an assortment of features so you can select the model that best suits your specific needs and budget. Your local pool professional can compute your heating requirements and install the AquaCal unit that is right for you.