An index of the various types of heat pipes:
- Standard Heat Pipes, which act as a thermal superconductor (typically copper-water in terrestrial applications or for box-level space cooling, and aluminum-ammonia (CCHPs) in radiator designs in space applications)
- Annular Heat Pipes, which have an inner cavity and are highly isothermal
- Variable Conductance Heat Pipes (VCHPs), which have a non-condensable gas loading to help maintain the evaporator temperature under changing conditions
- Pressure Controlled Heat Pipes (PCHPs), a form of VCHP where the reservoir size or gas loading can be changed
- Vapor Chambers, which allow heat flux transformation, and heat spreading in two dimensions
- HiK™ Plates, which have heat pipes embedded in plates to improve the effective thermal conductivity to 500-1200 W/m K
- Heat Pipe Heat Exchangers, for energy recovery in commercial buildings
- Diode Heat Pipes, which allow heat flow in only one direction
- Thermosyphons, which are gravity aided heat pipes
- Loop Thermosyphons, a thermosyphon variant with different flow paths for the vapor and liquid
- Rotating Heat Pipes, where the centrifugal forces generated in a rotating system return the fluid, rather than relying on a wick
- Rotating HiK™ Shafts, with multiple heat pipes embedded in a rotating shaft, allowing higher performance than a single rotating heat pipe
- Loop Heat Pipes, are passive, two-phase heat transport devices
- Heat Pipe Loops, a heat pipe variant with wick only in the evaporator, allowing operation over longer lengths