Ultra-low freezer

Right fit. Right partner. Right choice.
Thermo Scientific -80°C lab freezers, also known as ultra-low freezers (ULT), are designed first and foremost to protect samples. They're also designed to maximize storage capacity by offering a range of upright and chest models to accommodate a variety of laboratory footprint requirements. Additional features include energy-savings models that meet today's sustainability demands. Protect your samples with the right, energy-efficient ultra-low temperature freezers; choose from our TSX, Standard Performance (STP) or Performance platforms.

Use our ULT selection guide, browse through our portfolio below, or ask one of our experts to help tailor a solution specific to your needs.

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Which kind of ULT freezer best fits your needs?


Performance ultra-low freezers

Standard performance (STP) ultra-low freezers

Premium (TSX) ultra-low freezers

 ”standard ULT freezer”advanced ULT freezer”premium ULT freezer
 Dependable sample storage is our standard. Choose an ultra-low temperature freezer designed specifically for reliability.Exceptional performance for everyday assurance. Protect your precious samples and reduce your energy costs with an ultra-low temperature freezer that's built to last.Peace of mind protection for precious samples. Because your focus should be your discoveries. Our focus is keeping them safe. Our TSX ultra-low temperature freezers provide prime protection, even in the most taxing conditions.
Daily energy consumption as low as 12.0 kWh/dayas low as 10.5 kWh/dayas low as 7.9 kWh/day
Door opening recoveryas low as 19 minas low as 11 minas low as 17 min
Heat rejection (HVAC load)MediumLowLowest
SoundNormalQuietMost quiet
Cooling technology2-stage cascade compressor

2-stage single speed compressors
Powered by H-Drive

2-stage variable speed compressors 
Powered by V-Drive
System refrigerantsHFC1Natural HC2Natural HC2
Upright freezer storage capacity280-360 boxes3300–600 boxes3400–700 boxes3
User interfaceMicroprocessor controlHIC: Touch button controllerVIC: Touchscreen
CertificationsUL, cUL, CE, RoHS, xFDA4UL, cUL, CE, RoHS, FDA Class II, ENERGY STAR®5UL, cUL, CE, RoHS, ENERGY STAR®
Outer doorsDoubleSingleSingle
U.S. EPA SNAP compliant 

EU F-Gas compliant
Chest freezers  
Soft grip handle  
Thin wall high density storage 
On-board event/temp. recording 

(service only)

Remote monitoring compatible
Access/user setting controls
USB port for data download 

(service only)

Setpoint security
Access key/card control options  
 Explore Performance ULTsExplore STP ULTsExplore TSX ULTs
  1. Hydrofluorocarbon (HFC) refrigerants: legacy refrigerants, higher global warming potential (GWP)
  2. Natural hydrocarbon (HC) refrigerants: Environmentally friendly, low global warming potential (GWP), SNAP approved.
  3. 2-inch (5cm) high boxes
  4. xFDA certification in various countries. Example: FDA Class 1-US, CFDA-China
  5. On select 600 box STP models

3D Demo: Explore TSX Ultra Low Temperature Freezers

A software tool for exploring the internal and external benefits of the Ultra Low Freezers. Hot spots throughout the tool feature data, researcher opinions, and technical specifications. Mouse operation enables rotation, zoom, and measurement.

ULT brochure

Stability and reliability, without sacrifice.

With temperature security, quick recovery, and reliable validation, Thermo Scientific Ultra-Low Temperature (ULT) freezers are designed to deliver confidence — all while reducing your energy footprint.

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Standard storage tubes

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Externally threaded universal tubes
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