EXT-440CU Liquid Cooling System, Copper

CE Certified RoHS Certified
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EXT-440CU is a compact ambient liquid cooling system. This model contains a single x 120mm fan copper/brass radiator, providing roughly 400W of cooling with a 25°C ambient delta. Just add tubing, fittings, coolant, and connect to your cold plate(s).

  • Cooling capacity: 400W (1365BTU/hr) with 25°C liquid-ambient delta @ 4.5LPM
  • Radiator fan speed: automatic based on temperature, or 10 manual levels
  • Pump: 10 manual levels, up to 4.5LPM (1.2GPM)
  • Adjust audio alarm based on 3 included temperature sensors
  • Relay trigger can be adjusted based on temperature
  • Power input: 12VDC (via computer Molex plug), or 110/220VAC with separate adapter
  • Reservoir capacity: 157ml (5.3 fl oz)
  • G 1/4 BSPP threads on back for fittings
Weight 5.50 lb (2.49 kg)
Max Pressure @ 25°C 2kgf/cm2 (28.5psi)
Max Temperature 60°C (140°F)
Cooling Systems
Cooling Capacity 400W (1365BTU/hr) @ 25°C liquid-ambient (25°C dT)
Display Type LED
Flow Rate 4.5LPM (1.2GPM)
Max Power Consumption 17W
Power Source 12 VDC (110/220 VAC with Separate Adapter)
Radiator Brass/Copper, 1 x 120mm fan
Temperature Sensors 10K Thermistors
Diagrams / Models (See Files Tab for Diagrams and 3D Models)


Liquid Coolants

Koolance's product warranty does not cover the use of 3rd-party coolants, coolant additives, or corrosion. Koolance LIQ-702 or LIQ-705 coolants are strongly recommended to help avoid issues with mixed metals or biological growth. Additionally, do not use aluminum with bare (unplated) copper or bare (unplated) brass in the same system. Do not use silver with nickel in the same system.