Why choose ThermoRack 401? 

  • Our most popular rackmount chiller with over 3,000 units sold
  • Cooling capacities from 315 to 420 watts depending on configuration
  • ±0.05°C Temperature Stability/repeatability, even at ambient temperature
  • Improves laser performance: improves stability, reduces beam variation
  • Compact size: 19” x 21” x 7” 4U
  • Uses thermoelectric technology for high reliability, with no compressor and no Freon
  • Low noise, low vibration
  • Available with either centrifugal pump or long-life gear pump
  • Configurable with either aluminum or copper cold plate to match your system
  • Improved design with even better energy efficiency
  • Universal power – plug in and go anywhere in the world
  • USB or RS232 communications
  • Perfect for any application where a rackmount solution is preferred


ThermoRack 401 Cooling Curves

ThermoRack 401 Pump Curves


Operating Range:
5°C to 45°C standard (-5°C to 45°C LT option)
Ambient Temperature:
10°C to 40°C non-condensing
Stability / Repeatability:
± 0.05°C at constant load (even near ambient)
Cooling Capacity*:
315-420 watts @ 20°C (20°C ambient)
depending on configuration
Noise at 1 meter**:
2 Fan: < 55 dBA (50% load), <63 dBA (with full load)
Quiet: < 48 dBA (50% load), < 58 dBA (with full load)
Coolant / Process Fluid:
Koolance (27% propylene glycol / water mix)
or 27-50% ethylene glycol / water mix
Process Fluid Fittings:
1/4” CPC with shut off valves
Centrifugal pump or Magnetic Drive Gear Pump
Flow Rate:
Centrifugal: ~2 lpm @ 15 psig
Gear Pump: 3 lpm @ 30 psig (factory adjustable)
Tank Volume:
1 liter with level sensor
Wetted Materials:
Aluminum, stainless steel and polymers or
Copper, stainless steel, brass and polymers
Size (W x D x H):
19" x 21" x 7" 4U (48 cm x 53 cm x 18 cm)
39 lbs (18 kg)
Power Input:
Universal: 100-240 VAC, 50/60 Hz, 9-4 amp max
Digital PID controller for heating and cooling
Keypad, USB or RS232 Interface
Temperature, fluid level, system or component
failure (display and USB or RS232)
TUV listed to UL, CAN/CSA and EN 61010-1,
CE 61010-1, RoHS compliant
2 years
* Note: Cooling capacity will vary with configuration
**Note: Noise levels measured with centrifugal pump