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Antec Kuhler H2O 620 Water Cooler Review

The Antec Kühler H2O 620 looks similar to the rest of the closed “ready to run” water cooling kits currently available but there are a few distinct differences. The most important difference probably is the use of flexible rubber tubing rather than corrugated pipes which are tough to bend. Despite the short length of less than 33cm, the tubing does turn easily and without kinking. The outer diameter of the tubing is considerable compared to that of other kits, measuring 11mm in diameter; however we are unsure if the inner diameter is larger as well or if the rubber tubing simply has thick walls.


Antec went with a classic single fan radiator design, which despite its thin size and lightweight construction has been proven to perform well over the years. The quality of the radiator is very good but, like all similar designs, the very thin and flimsy aluminum fins are extremely easy to bend.


The OEM behind Antec’s Kühler H2O 620 water cooler is Asetek and Antec makes no effort to hide this; Asetek’s logo is printed onto the sticker found at the bottom side of the radiator, right next to the product’s bar code and the RoHS and CE certifications.

The small circular base of the product houses the low profile liquid pump and the copper thermal absorption plate. Around the edge of the base there is a series of notched sockets, which are used to lock the base on the mounting bracket during installation. The liquid tubes are attached onto the base by using metallic 90° fittings. There are two wires leaving the base of the cooler, one for powering the cooling fan and one to connect onto the motherboard’s CPU fan header which powers and controls both the pump and the radiator’s fan altogether.

It appears that the base assembly is being held together by a plethora of screws. Ten screws are holding the copper plate secured onto the bottom part of the assembly and fourteen screws hold the bottom and top parts of the base together. At the middle of the copper plate we found thermal compound pre-applied. The copper plate could have been a little better polished but it would not made a difference with the thick factory applied thermal compound.

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