The Reservoir is where the liquid for the system is circulated into. The reservoir helps release air bubbles and hold extra liquid for when the system evaporates small amounts that need to be replenished. The size of the reservoir doesn’t increase the cooling capacity of the system, but the larger a reservoir is, the more time it will take the whole system to heat up to its thermal equilibrium.
The pump is the component responsible for the flow of coolant, making it possible for the transfer of heat. Most liquid cooling pumps are lubricated by the liquid in the system, therefore it’s very important to never run the pumps dry as this could result in a damaged pump that will not operate efficiently. This user error will void the warranty.
There are two types of water-cooling pumps available on the market, namely DDC and D5. The D5 has a better flow rate at lower pressure, while the DDC has a lower flow rate, but higher pressure. The DDC is better suited for compact builds, whereas the D5 is better suited for larger builds. Both Pumps are of exceptional quality and should last years.