EasyTemp heat pumps feature titanium heat exchangers which offer a high resistance to chemicals while ensuring an excellent heat exchange. And every EasyTemp model utilizes an electronic temperature control, ensuring constant temperature and energy savings while controlling the water temperature to within 0.5 degrees F. The Thermostatic expansion valve protects the compressor and supplies exactly the right amount of refrigerant to obtain optimal performance, regardless of outdoor temperature. EasyTemp heat pumps utilize 2 in. plumbing and operate on 208-240 volts.