Stirling Ultracold SU105UE Undercounter Ultra-Low Temperature Freezer
Some laboratories don't need a large centralized ultralow freezer—they need dependable ultra-low temperature storage exactly where the work is being done. The Stirling Ultracold SU105UE Undercounter Ultra-Low Temperature Freezer was developed to provide reliable -86°C sample preservation in a compact footprint that fits beneath laboratory benches, on benchtops, or in stacked configurations. Its combination of Stirling engine technology, low energy consumption, and flexible installation has made it a popular choice for laboratories that require dedicated ultra-low storage without sacrificing valuable workspace.
With 3.7 cubic feet (105 liters) of storage capacity and room for up to 72 standard 2-inch cryoboxes, the SU105UE is ideal for individual research groups, clinical laboratories, pharmaceutical development, university departments, and biotechnology companies. Powered by Stirling's patented free-piston engine, the freezer delivers dependable ultra-low temperature performance while consuming significantly less energy than many conventional compressor-based ULT freezers.
Laboratories building a complete cold storage workflow frequently pair compact ultralow freezers with laboratory refrigerators for media and reagent storage, laboratory freezers for intermediate-temperature materials, and larger ultralow freezers for centralized long-term sample archives. The SU105UE fills an important role by providing dedicated ultra-low storage directly within the laboratory workspace.
Stirling Ultracold SU105UE Key Features
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3.7 cu. ft. (105 L) storage capacity
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Holds up to 72 standard 2-inch cryoboxes
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Adjustable operating temperature from -20°C to -86°C
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Patented free-piston Stirling engine
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Compressor-free refrigeration system
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Undercounter, benchtop, or stackable installation
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Auto-voltage operation (85–264V, 50/60 Hz)
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Graphical touchscreen user interface
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Audible and visual alarm system
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Less than 4 kWh/day energy consumption at -80°C
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100% natural refrigerants
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Refurbished and performance tested by American Instrument Exchange
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90-day warranty included
Stirling Ultracold SU105UE Overview
The SU105UE was engineered for laboratories that need dependable ultra-low storage without dedicating floor space to a traditional upright freezer. Its compact cabinet can be installed beneath standard laboratory counters, placed on a benchtop, or stacked to expand storage capacity while maintaining a remarkably small footprint.
Instead of conventional cascade compressors, the SU105UE utilizes Stirling's patented free-piston engine with continuous cooling modulation. This design reduces mechanical complexity, lowers energy consumption, minimizes laboratory heat generation, and provides excellent temperature stability throughout continuous operation. The integrated graphical user interface gives users convenient access to freezer status, alarm settings, event logs, and performance information.
Many laboratories position the SU105UE alongside biosafety cabinets, CO₂ incubators, and refrigerated centrifuges, allowing researchers to prepare, process, and preserve valuable biological samples within the same workspace while minimizing unnecessary sample movement.
Common Applications
The Stirling Ultracold SU105UE is commonly used for:
Its compact footprint makes it particularly well suited for individual research laboratories, hospital specialty laboratories, biotechnology startups, university departments, GMP cleanrooms, and satellite laboratory facilities where a full-size upright ultralow freezer would occupy unnecessary space.
Ideal Laboratory Types
The SU105UE is an excellent choice for:
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Academic research laboratories
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Biotechnology companies
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Pharmaceutical manufacturers
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Cell and gene therapy laboratories
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Hospitals and clinical laboratories
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University core facilities
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Public health laboratories
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Cleanroom environments
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Research groups requiring dedicated ultra-low storage
Temperature Recovery & Sample Protection
Although compact, the SU105UE delivers the same ultra-low temperature performance expected from larger Stirling platforms. The free-piston Stirling engine continuously adjusts cooling output to maintain stable cabinet temperatures while minimizing energy consumption and mechanical wear.
Vacuum insulation panels maximize usable storage volume while improving thermal efficiency, and the compact cabinet volume supports rapid temperature recovery following routine door openings. Laboratories preserving especially valuable biological collections often use the SU105UE alongside cryogenic storage systems, allowing each preservation technology to support the applications where it performs best.
Typical Stored Materials
The SU105UE is commonly used to store:
Stirling Ultracold SU105UE Key Specifications
Capacity
Temperature Range
Refrigeration System
Monitoring & Controls
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Graphical touchscreen interface
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Adjustable audible and visual alarms
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Event logging
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Password-protected settings
Installation
Electrical Requirements
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Auto-voltage: 85–264V AC
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50/60 Hz
Dimensions
Weight
Energy Efficiency & Operating Costs
One of the defining advantages of the SU105UE is its exceptionally low operating cost. The patented Stirling engine consumes less than 4 kWh/day at -80°C, generates substantially less heat than many conventional cascade refrigeration systems, and virtually eliminates compressor cycling. For laboratories operating multiple ULT freezers, lower electrical demand and reduced HVAC loading can contribute to meaningful long-term operating savings.
Specifications compiled from Stirling Ultracold manufacturer literature and American Instrument Exchange product information.
Refurbishment & Testing Process
Every Stirling Ultracold SU105UE received by American Instrument Exchange undergoes a comprehensive inspection and extended performance evaluation before shipment. Our technicians verify pull-down performance, confirm stable operation throughout the operating temperature range, inspect the Stirling engine cooling system, test alarms and touchscreen controls, evaluate door gaskets and cabinet insulation, verify temperature stability, and thoroughly clean the freezer before delivery.
Shipping & Installation Considerations
The Stirling Ultracold SU105UE ships by freight from American Instrument Exchange. Before installation, laboratories should verify undercounter clearances, electrical service, and adequate ventilation around the cabinet. Its compact footprint, stackable design, and universal power capability make it well suited for laboratories where flexibility and efficient use of space are priorities.
Frequently Asked Questions
Can the SU105UE be installed under a laboratory counter or stacked?
Yes. The SU105UE was designed for undercounter, benchtop, or stacked installation, allowing laboratories to add ultra-low temperature storage without dedicating space to a full-size upright freezer.
Does the SU105UE require a dedicated 240V outlet?
No. One of the key advantages of the SU105UE is its auto-voltage capability. It accepts 85–264V, 50/60 Hz input power, allowing it to operate in laboratories around the world with the appropriate power cord.
Why is Stirling engine technology more energy efficient than many conventional ULT freezers?
The patented free-piston Stirling engine continuously modulates cooling output rather than cycling compressors on and off. This reduces energy consumption, lowers heat generation, and minimizes mechanical wear while maintaining stable ultra-low temperatures.
How does American Instrument Exchange test refurbished SU105UE freezers?
Every refurbished SU105UE undergoes an extended operational evaluation to verify pull-down performance, temperature stability, alarm operation, touchscreen functionality, and overall Stirling engine performance before shipment to help ensure dependable laboratory operation.
