Low-GWP Small Packaged
Water-Source Heat Pumps
Compare single-stage, two-stage, and premium small packaged water-source heat pump models across the ClimateMaster commercial lineup.
Single-Stage Model
Tranquility® 18 SC
Compact single-stage water-source heat pump designed for retrofit installations and tight mechanical spaces.
Single-Stage Model
Tranquility® 18 SR
Versatile single-stage water-source heat pump designed for a wide range of commercial geothermal and water-loop HVAC applications.
Two-Stage Model
Tranquility® 24 SY
Compact two-stage water-source heat pump designed to improve part-load efficiency and comfort in commercial geothermal HVAC systems.
Two-Stage Model
Tranquility® 24 SZ
High-performance two-stage water-source heat pump designed for applications requiring enhanced efficiency and capacity flexibility.
Premium Model
Tranquility® SE
Premium water-source heat pump engineered for high-performance geothermal HVAC systems and demanding commercial environments.
Low-Profile Model
Tranquility® SL
Low-profile water-source heat pump designed for installations where mechanical space is limited.
Selecting a Small Packaged Water-Source Heat Pump Model
Single-stage models provide reliable heating and cooling performance for standard commercial installations and retrofit applications. Two-stage models improve part-load efficiency and comfort by adjusting capacity to match changing building loads.
Premium models offer advanced performance and specialized configurations for projects that require enhanced efficiency, expanded capacity options, or installation flexibility.
| Model | Stages | Capacity | Cabinet | Configuration | Best Application |
|---|---|---|---|---|---|
| Tranquility® 18 SC | Single | 0.5–5 tons | Compact | Horizontal | Retrofit installations |
| Tranquility® 18 SR | Single | 0.5–6 tons | Versatile | Horizontal | Standard commercial installs |
| Tranquility® 24 SY | Two | 0.5–5 tons | Compact | Horizontal | High-efficiency systems |
| Tranquility® 24 SZ | Two | 0.5–6 tons | Versatile | Horizontal | Premium performance |
| Tranquility® SE | Premium | 1–6 tons | Standard | Horizontal | High-end projects |
| Tranquility® SL | Premium | 1–5 tons | Low Profile | Low-profile horizontal | Tight mechanical rooms |
Key Features
Commercial Water-Loop Systems
Designed for geothermal and boiler/tower water-loop HVAC applications.
Single & Two-Stage Compressors
Compressor options deliver reliable comfort and improved part-load efficiency.
Flexible Capacity Range
Units available from 0.5–6 tons to support decentralized commercial HVAC systems.
Low-GWP Refrigerant
Uses R-454B refrigerant to support sustainability goals and regulatory transitions.
ASHRAE 90.1 Performance
High-efficiency design helps support energy performance requirements.
Building Automation Integration
Compatible with BACnet, Modbus, and modern building management systems.
Small packaged water-source heat pumps are self-contained heating and cooling units used in commercial geothermal and water-loop HVAC systems. Each unit conditions the air for an individual space while transferring heat through a shared water loop that circulates throughout the building. This decentralized approach allows offices, classrooms, guest rooms, and other zones to maintain independent comfort control while improving overall system efficiency.
Office Buildings
Water-source heat pumps provide decentralized heating and cooling for office spaces while supporting efficient zone control across changing occupancy and load conditions.
Schools & Universities
Zoned comfort control supports classrooms, administrative areas, and campus facilities where quiet operation and long-term energy performance are important.
Hospitality & Hotels
Individual room control and quiet performance make water-source heat pumps a strong fit for hospitality applications that prioritize guest comfort.
Healthcare Facilities
Reliable zoning and efficient operation support a wide range of healthcare environments where comfort, flexibility, and system performance are essential.
Multifamily Buildings
Water-source heat pumps help support efficient heating and cooling for apartments, condominiums, and mixed-use residential buildings with varying zone demands.
Government & Institutional Buildings
Commercial water-source heat pumps are well suited for institutional facilities that need durable performance, energy efficiency, and dependable zone control.
Low-GWP Refrigerant Technology in
Commercial HVAC
ClimateMaster small packaged water-source heat pumps use R-454B refrigerant, a lower global warming potential alternative that supports the HVAC industry's transition toward more environmentally responsible refrigerants while maintaining the performance expected in commercial geothermal and water-loop HVAC systems.
- Reduced environmental impact
- Future-ready refrigerant regulations
- Maintains high efficiency performance
Building Automation Compatibility
ClimateMaster small packaged water-source heat pumps are designed to integrate with modern building automation and energy management systems. Communicating controls and open protocol options allow these units to be monitored and managed as part of a larger building HVAC strategy.
Available control options support integration with common building management platforms, allowing facility operators to monitor performance, adjust operating parameters, and manage system efficiency across multiple zones.
Supported integration options include:
ClimateMaster provides a full set of technical documentation to support the design, specification, and installation of small packaged water-source heat pumps. These resources help engineers and contractors evaluate performance, integrate systems, and support project documentation.
Explore additional ClimateMaster geothermal and water-source HVAC solutions designed for commercial buildings. Water-source heat pumps are commonly used in office buildings, schools, healthcare facilities, hotels, and multifamily properties. Explore additional commercial HVAC applications to see how geothermal and water-loop systems are used across different building types.
A water-source heat pump is a self-contained HVAC unit that heats and cools an individual space by transferring heat to or from a shared water loop. These systems are commonly used in commercial buildings that require zoning flexibility, energy efficiency, and quiet operation.
Geothermal heat pumps move heat between the building and a connected water loop or ground heat exchanger. In commercial applications, individual water-source heat pumps can reject or absorb heat through the loop, helping the system respond efficiently to changing loads throughout the building.
Low-GWP refrigerant is refrigerant with a lower global warming potential than legacy options. ClimateMaster small packaged water-source heat pumps use R-454B refrigerant to support the industry's transition toward lower-impact refrigerant solutions while maintaining strong commercial HVAC performance.
Water-source heat pumps are commonly used in office buildings, schools, hotels, healthcare facilities, and multifamily projects. They are a strong fit for buildings that benefit from individual zone control, quiet operation, and efficient heating and cooling performance.
Yes. Commercial geothermal and water-loop heat pump systems are known for high efficiency because they transfer heat rather than generate it directly. This approach can improve part-load performance, support heat recovery within the building, and help reduce overall energy use.