Building a Complete Watercooling Loop

Building a Complete Watercooling Loop

Building a custom water cooling loop is one of the most rewarding things you can do with a PC, but it requires careful planning. A complete loop has several components: a water block that sits on the CPU or GPU, a pump that moves the liquid, a radiator that dissipates heat, a reservoir that holds extra coolant and helps bleed air, and tubing that connects everything together.

The pump is the heart of the loop. Most custom loops use a D5 or DDC pump, which are reliable and powerful enough for most builds. The pump should be placed after the reservoir, so it always has a supply of liquid. Running a pump dry, even for a few seconds, can destroy it. The reservoir also serves as a place to fill the loop and to watch for air bubbles during the initial fill.

Radiators come in different sizes, measured by the number of fans they support. A 240mm radiator has two 120mm fans, a 360mm has three, and so on. Thicker radiators offer more cooling capacity but need higher static pressure fans to push air through them. As a rule of thumb, you want at least 120mm of radiator space for each component you are cooling, plus extra for overclocking headroom.

Tubing comes in two main types: rigid and soft. Rigid tubing, usually acrylic or PETG, looks cleaner and allows for more precise routing, but it is harder to work with and requires bending with a heat gun. Soft tubing, usually EPDM or silicone, is much easier to install and more forgiving of mistakes. For a first build, soft tubing is highly recommended.

Fittings are the connectors that join tubes to components. You need the right size for your tubing, measured by outer diameter and inner diameter. Compression fittings have a ring that screws down over the tube for a secure seal. Every 90-degree bend in your loop should use a fitting rather than forcing the tube to bend, which can restrict flow. Plan your loop layout carefully before buying fittings.