WaterFurnace’s 3 Series 300A11 geothermal heat pump offers efficiencies up to 22.3 EER and 4.1 COP. The series features Copeland UltraTech two-stage scroll compressors and five-speed ECM blowers. It comes standard with durable, all-aluminum air coils. It can be used in conjunction with the IntelliZone2 24 volt zoning system to precisely control the temperature in up to four zones. An optional soft starter reduces start-up amperage by up to 60% of normal draw. All models are Energy Star-rated and utilize ozone-safe R410A refrigerant.