Stirling Ultracold SU105U Undercounter Ultra Low Temp Freezer is a high-efficiency, compact ULT freezer designed for -70°C to -86°C storage of vaccines and biological samples. Ideal for clinical trials, laboratory, and pharmaceutical applications, this freezer provides ultra-low temperature storage within a flexible footprint — under-counter, freestanding, or stacked configurations.
Key Features:
- Temperature Range: -86ºC to -20ºC (adjustable in 1°C increments)
- Storage Volume: 105 liters (3.7 cu. ft.)
- Storage Capacity: 72 standard 2" boxes
- Compact footprint fits under counters, can be stacked or used freestanding
- Efficient thin-wall vacuum insulation with a fully sealed thermosiphon system
- Only 230 watts at ambient startup; significantly reduces energy usage
- Free-piston Stirling engine technology with no compressor or cascade system
- Intuitive graphic user interface with integrated alarm and monitoring system
- UL and CE certified
- Environmentally responsible and energy efficient
Advantages
- Up to 50% less energy usage than conventional ULT freezers
- Stores more samples in less space
- Can plug into any standard 100–240V outlet
- Virtually maintenance-free cooling engine
- No compressor, oil, or refrigerant required
Included
- Stirling SU105U Undercounter ULT Freezer
- Power Cord (Select Voltage Option)
- Operator's Guide
- Manufacturer’s Documentation
- 7-Year Engine & Thermosiphon Warranty / 2-Year Parts & Labor Warranty
Specifications
| Storage Volume | 105 L (3.7 cu.ft.) |
| Storage Capacity | 72 standard 2" boxes |
| Temperature Range | -86ºC to -20ºC |
| Interior Dimensions (H x W x D) | 533 x 457 x 432 mm (21 x 18 x 17 in.) |
| Exterior Dimensions (H x W x D) | 864 x 686 x 711 mm (34 x 27 x 28 in.) |
| Net Weight (Empty) | 100 kg (220 lbs.) |
| Shipping Dimensions (L x W x H) | 1041 x 787 x 787 mm (41 x 31 x 31 in.) |
| Shipping Weight | 121 kg (266 lbs.) |
| Power Requirements | 100–240V (±10%) | 50/60 Hz | 300 watts max |
| Startup Power | 230 watts typical |
| Max Current Draw | 3A @120V / 1.5A @240V |
| Outlet Requirement | 15A or greater grounded circuit |
| Ambient Operating Temperature | +5ºC to +35ºC (41ºF to 95ºF) |
| Certifications | UL, CE |
Optional Accessories
- Freezer Racks & Inventory Systems
- 6” Chart Recorder Kit (with 6 pens, 60 charts & temperature probe)
- North America 120V/240V/230V Power Cords (NEMA 5-15R, 6-15R, L6-15P)
- 1-Year Extended Warranty (PN: SU105EXT)
- Certificate of Calibration (NIST-traceable)
- Factory-Installed Stacking Adapter (PN: SU-105U-1A100)
- CO₂ Back-up System (PN: CO2FA-0P1000)
- LN₂ Back-up System (PN: LN2FA-0P1000)