DIY Copper Heat Pipe – Flat Sintered Liquid-Filled Thermal Tube for Laptop CPU GPU Heatsink Repair

Measure the distance between the heat source (CPU/GPU die) and the heatsink fin stack on your specific laptop or device. Choose a length that spans that distance with minimal bending. Available lengths range from 50mm (≈2.0") to 450mm (≈17.7"). When in doubt, size up slightly — heat pipes can be trimmed and re-sealed by experienced technicians, but generally it is easier to work with a pipe that is slightly longer than needed.

Check the thickness of the original heat pipe in your device before ordering. Most slim ultrabooks and thin-and-light laptops typically use 2.5mm flat heat pipes, while standard-thickness laptops and desktop CPU coolers generally use 3.0mm pipes. The 5cm, 25cm, 35cm, 40cm, and 45cm variants are available in 3.0mm only; all other lengths offer both 2.5mm and 3.0mm options.

Sintered copper heat pipes of this flat profile (8mm wide) typically handle 15–40W of continuous heat flux depending on length, orientation, and working fluid fill. They are generally sufficient for laptop CPU and GPU thermal management in the 15–65W TDP range. For higher TDP applications, consider using multiple pipes in parallel.

Copper heat pipes are naturally resistant to corrosion in typical indoor electronics environments. However, they are not designed for prolonged exposure to moisture, salt spray, or outdoor conditions. For outdoor or industrial applications, additional protective coatings or enclosures are recommended.

These flat copper heat pipes are designed to be compatible with the standard flat-pipe heatsink assemblies found in most laptops and compact electronics. The 8mm width and 2.5/3.0mm thickness match the most common OEM specifications. Always verify your device's original pipe dimensions before purchasing.

Installing a replacement heat pipe typically requires disassembling the laptop or device, removing the old heatsink assembly, and soldering or pressing the new pipe into place. You will generally need thermal paste, precision screwdrivers, and soldering equipment if the pipe is soldered to the heatsink fins. This is an intermediate-to-advanced DIY repair task.

These heat pipes use a sealed liquid working fluid (typically deionized water or a similar low-boiling-point fluid) combined with a sintered copper wick structure. The sintered wick provides capillary action to return condensed fluid to the evaporator end, enabling passive, pump-free thermal transfer.