Offering efficiency as high as 16.6 EER and up to 18.5 EER in ground loop applications, Premium Efficiency Vertical Stacked Water Source Heat Pump features flexible design that allows for simple zoning, tenant metering, and building expandability. Unit is housed in heavy gauge, corrosion-resistant steel cabinet and interfaces with standard thermostats. Featuring 3 supply air openings, ECM motors, and MERV 8 filters, heat pump is suited for multi-story buildings with consistent floor plan.