The Tranquility® 30 Digital (TE) Series geothermal heat pumps integrate digital communicating controls, two-stage capacity, variable-speed fan, and variable-flow geothermal source functions within a single package. The series delivers up to 30 EER and 4.8 COP. The system is available in vertical upflow, vertical downflow, and horizontal configurations in nominal capacities of 26, 38, 49, 64, and 72 kBtuh. The heat pump series has been designated as a Most Efficient Energy Star-qualified product for 2012 due to its ultra-high efficiency and smart controls. The Tranquility 30 Digital Series utilizes iGate™ technology, the next generation in intelligent control, by using two-way communication to provide a gateway into the system. The iGate control system allows end users and contractors to monitor the performance of the unit, custom tailor its operation, and diagnose any issues, right from the thermostat. The iGate thermostat can also be used to configure and tailor the system without touching the unit. The vFlow variable water flow technology builds the major water circulation components into the unit for a clean installation, and intelligently varies the water flow to minimize pump energy consumption and improve system reliability.