Water-to-Water Heat Pumps - Withair® Heating and Cooling, Air Conditioning, Heat Pump, Chiller, Industrial Process Cooling & Heating Systems, and Indoor Air Quality

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Water to Water Heat Pumps

Capacity Range: 2 to 80 tons, 50 and 60 Hz
Refrigerant: R-410A, R-454B
Compressor Type: Hermetic Rotary / Scroll

Superior comfort
Low life cycle costs
Better sustainability
Outstanding energy efficiency
Ultra-low noise, integrated controls
Multiple configuration options for flexibility
Microprocessor controls with optional BAS interfaces
Brazed Plate heat exchanger or Co-axial heat exchanger
The ideal solution for cooling & heating even in colder climates
High-efficiency scroll compressor with vibration mounting isolation
Connectivity, flexibility and serviceability enabled by smart controller
Smart microchip control, LCD user interface, capable of one-key startup

OVERVIEW
MODELS
OPTIONS
RESOURCES
SERVICES
RELATED PRODUCTS

Overview

Outstanding Efficiency, Lower Operating Costs, Interior Comfort

Withair’s Water-to-Water Heat Pump offers residential/commercial users a win-win proposition: Outstanding energy efficiency, with up to 47% lower heating and cooling costs; excellent sustainable indoor comfort provided by utilizing the earth’s natural geothermal heat or a boiler/cooling tower.

Provides cold or warm water on-demand; ideal for fresh air ventilation, radiant floor heating or process cooling.
Maximize System Performance by Deluxe Controls

The smart electronic controls are unique to Withair’s water-source equipment. Designed for enhanced component protection and optimal system performance, the microprocessor board is factory-wired and ready for field installation. Optional advanced connectivity kit including connectivity to any BMS on Site.

Control features include: Reversing valve coil; Compressor protection; Compressor delay on start; Random start delay; Anti-short cycle timer; Brown-out protection; Low pressure time delay; Low and high pressure switches.
Wide Operating Range

The extended operating range allows the unit to work in a wide range of cooling and heating operating temperatures (up to 55°C condenser leaving water temperature). Suitable to brine operation down to -10°C evaporator leaving water temperature (brine option provided as standard).
Compact Design, Easy Installation and Service

Withair’s unique compact design makes the Water-to-Water water source heat pump easy to install. Compact and efficient units, the perfect choice for your building. All units are verified to ensure maximum performance before shipping.

Front panel entry makes it easy for contractors quickly gain access to most major components and service as needed.
Maximize Indoor Air Comfort with Withair's Air Systems

Fresh air system in residential/commercial building applications is achieved by pairing the Water-to-Water Heat Pump. Benefits include: total building comfort; enhanced dehumidification; efficient heating and cooling.
Optional Waterside Economizer System

If the water-source system design contains an economizing coil option, the moderate temperature loop water circulated through a core water source system can provide an inexpensive means to satisfy room comfort without operating the water source heat pump's compressor.

During economizer mode, fluid enters the unit, and passes by a water temperature sensing bulb. This temperature sensing bulb determines whether the two position, three-way valve will direct the water through the waterside economizing coil, and to the heat pump condenser, or through the condenser only. If the water temperature is 55℉(12.8℃) or less, fluid will flow into the economizing coil, while simultaneously halting mechanical operation of the compressor. Mechanical cooling will continue on a call for second stage from the thermostat.

Models

Specifications	W01R2-08B	W01R2-12B	W01R2-15B	W01R2-20B	W01R2-25B	W01R2-30B	W01R2-40B
Capacity (Ton)	2.3	3.3	4.2	5.5	7.1	8.5	11.3
EER (kW/kW)	4.80	4.72	4.85	4.96	4.83	4.80	4.97
COP (kW/kW)	4.56	4.60	4.55	4.70	4.61	4.51	4.63
Compressor	Rotary	Scroll	Scroll	Scroll	Scroll	Scroll	Scroll
Evaporator	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate
Condenser	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate
Voltage	230, 208	230, 380/415, 460	230, 380/415, 460	230, 380/415, 460	230, 380/415, 460	230, 380/415, 460	230, 380/415, 460
Frequency	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60
Refrigerant	R-410A, R-454B	R-410A, R-454B	R-410A, R-454B	R-410A, R-454B	R-410A, R-454B	R-410A, R-454B	R-410A, R-454B
Heat Recovery	Option	Option	Option	Option	Option	Option	Option
Inverter Version	Option	Option	Option	Option	Option	Option	Option

Specifications	W01R2-50B	W01R2-60B	W01R2-80B	W01R2-100B	W01R2-150B	W01R2-200B	W01R2-280B
Capacity (Ton)	14.4	17.3	22.5	28.7	43.0	57.3	80.5
EER	4.77	4.81	4.99	4.97	5.02	4.89	4.98
COP	4.58	4.65	4.76	4.71	4.69	4.69	4.67
Compressor	Scroll	Scroll	Scroll	Scroll	Scroll	Scroll	Scroll
Evaporator	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate
Condenser	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate	Brazed Plate
Voltage	230, 380/415, 460	230, 380/415, 460	230, 380/415, 460	230, 380/415, 460	230, 380/415, 460	230, 380/415, 460	230, 380/415, 460
Frequency	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60
Refrigerant	R-410A, R-454B	R-410A, R-454B	R-410A, R-454B	R-410A, R-454B	R-410A, R-454B	R-410A, R-454B	R-410A, R-454B
Heat Recovery	Option	Option	Option	Option	Option	Option	Option
Inverter Version	Option	Option	Option	Option	Option	Option	Option

Factory Installed Options

Unit Options

Frost Prevention Kit
Electric Heaters
Expansion Tank
Vibration Isolators
Sound Attenuation
Suction Shutoff Valves
Liquid Line Solenoid Valve
Evaporator Inlet Strainer
Double Evaporator Insulation
Partial Heat Recovery or Total Heat Recovery
Integrated Pump Packages
Condensate Overflow Switch
High Efficiency Inverter Compressor
High Fault Short Circuit Current Rating
Stainless Steel Heat Exchanger
Stainless Steel Frame
Flanged Water Connection Kit

Controls Options

Modbus, BACnet Communications Interface
Withair® Wireless Components
Door Mounted User Display
Remote User Interface
Fault Detection & Diagnostics
Flow Switch
Remote Input
Remote Output

Electrical Options

Quick Start and Fast Loading
Circuit Breaker
High Short Circuit Current Rating
Ground Fault Protection
115V Convenience Outlet
Power Connections
Multi-Point Power with Disconnect Switch

Resources

Name	Size	Download
Withair® Packaged Rooftop & Split DX Systems-Line-Card.pdf	550KB	Download
Withair® Solutions Offering-Line-Card.pdf	4.00MB	Download
Withair® HVACR SYSTEM SOLUTIONS OFFERING_2025 Version.pdf	3.54MB	Download
Withair® Water-Cooled-Chillers-Line-Card.pdf	483KB	Download
Withair® Air-Cooled-Chillers-Line-Card.pdf	679KB	Download
Withair® Air-Cooled-Heat Pumps-Line-Card.pdf	721KB	Download
Withair® Ground(Water)-Source-Heat Pumps-Line-Card.pdf	502KB	Download
Withair® Industrial Process Cooling & Heating Systems-Line-Card.pdf	506KB	Download
Withair® Air-Side-Products-Line-Card.pdf	1.69MB	Download