Whisperline® Two-Stage Water Source Heat Pump - OverviewWhisperline Two Stage Right Angle

Introducing the Whisperline® VD Series, the industry’s first and only 2-stage vertical stack water source heat pump; a highly efficient unit and the ideal solution for high performance buildings. The VD Series includes a two-stage scroll compressor and an ECM Motor (electronically commutated) resulting in superior efficiency and comfort.

This series offers our customers best-in-class comfort, efficiency and low noise levels along with a wide range of available options. The Whisperline® VD incorporates a number of features and options that provide maximum comfort and performance to users and maximum flexibility to engineers and architects.


  • Benefits
  • Technical Data
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Market Exclusivity

Industry’s first and only 2-stage vertical stack water source heat pump.

Energy Efficient

Best-in-class 2-stage efficiency provides year round savings.

Quiet Operation

Best-in-class sound levels and quiet operation. High efficiency ECM constant torque fan motor for low sound levels.

Ease in Serviceability

Service friendly features for easy repair and installation.

Application Flexibility

Extensive features and options to meet virtually any jobsite requirement.

Cabinet Design

Low leakage galvanized steel cabinet. Lift-out stainless-steel drain pan.

Low Vibration

Floating compressor design and cabinet isolation pad to minimize vibration transmission.

Superior Protection

Solid state safety controls for superior protection.

Supply Opening

Left, right, front, back and top combinations. All supply openings are painted black to block the view into the unit and when one unit is used for two rooms, a sight baffle is placed between the two grilles.

Supply/Return Risers

Provided to meet the requirements of the jobsite. Custom lengths and spacing can be provided to meet the exact floor to floor dimension of the project. Risers are factory installed and piped to ball valves within the cabinet.

Refrigeration Chassis

Removable-floating design with insulated compressor compartment and vibration isolation.


Technical Data Two Stage