Offering efficiencies up to 16.1 EER and 3.3 COP, 5 Series 504W11 Energy Star®-rated water to water heat pump operates in heating-only or heating/cooling mode and leverages OptiHeat vapor injection technology. Latter creates exiting water temperatures up to 150°F using additional heat exchanger that diverts excess heat and reinjects it into system. Additional system components include Copeland scroll compressors, R410-A refrigerant, and Aurora communicating controls platform.