WaterFurnace’s 5 Series 504W11 hydronic geothermal heat pump features patent-pending OptiHeat vapor injection technology, which creates exiting water temperatures up to 150° F. Offering efficiencies up to 16.1 EER and 3.3 COP, it is ideal for high-temperature applications. The units can operate in heating-only or heating/cooling modes. Copeland scroll compressors — double-isolation-mounted for quiet operation — combine with R410-A refrigerant and an extra heat exchanger to provide efficiency, reliability and energy savings. Control panels can be placed on either end, which allows piping to be located on the front or back.