ElmorLabs HOT300 Heater Controller


In stock (can be backordered)

SKU: HOT300_C Category:


Note: HOT300-B Heater Backplate is sold separately: https://www.elmorlabs.com/product/elmorlabs-hot300-heater-large-backplate/

The ElmorLabs HOT300 Heater Controller is an improved version of the previous HOT heater. Changes include higher power (up to 300W), voltage & current monitoring over I2C and an included acrylic case. The previous version backplates are compatible with the new controller.

This product is made for heating the PCB of a CPU or GPU to prevent issues with board components that may not function properly with sub-ambient cooling. Condensation is also reduced allowing your system to operate at low temperature for extended durations.

The HOT300 heater supports four individually controlled thermal zones which can be monitored and controlled by connecting it to an EVC2SX over I2C. The solution consists of two parts, one controller and one heater which are connected through a cable. With heating capabilities of up to 300W powered by a PCI-E 6-pin cable it will keep your board at ambient temperature even when using most extreme cooling.



  • Input power 12V (PCI-E 6-pin)
  • Input current max 25A (fused)
  • Heating power up to ~300W
  • Dimensions (HOT300-C)
    • 52 x 42 x 1.6 mm
  • Mounting holes (HOT300-C)
    • Dimensions 47.2 x 37.2 mm
    • Hole size M2 2.2 mm


  • HOT300-C circuit board (Controller)
  • Acrylic case