Closed-loop liquid cooler roundup: 9 AIO coolers reviewed

  • Published in Cooling reviews

Antec H20 1250

Most all-in-one coolers have a very similar layout. The pump and reservoir are usually attached to the cold-plate, and the radiator is separate. There are only a handful with a different architecture, and Antec H20 1250 is one of them. Instead of having a singular pump / reservoir / waterblock, it uses 2 medium sized pumps that are placed over the radiator.


The radiator measures 275x 120x 27mm, and has the same FPI count as Coolermaster's and ID-Cooling's, respectively 22fins-per-inch and 12 channels.

The fans are attached to the radiator, and sit directuly under the pumps, which means replacing them is a relatively difficult task. Unlike any other AIO on this list, all of which come with a single pump, one inlet and one outlet, Antec's H20 1250 has 2 separate smaller pumps and two inlets and two outlets.

This design should increase the volume of coolant pushed from pump A into the radiator through the first inlet, then into pump B, which pushes it into the waterblock.

Antec H20 1250 - Radiator

The layout would increase also pressure and velocity. However, such an over-complicated architecture has more potential failure points over the more traditional design.


There are two types of tubing used on the cooler – the hard tubes used to connect the radiator to the pumps and the flexible ones running to the waterblock. The flexible tubing is similar to what Asetek has been using for the past few years, namely flexible OD hoses made from low-evaporative rubber.

Antec H20 1250 - Tubing

The maximum length is only 300mm, so this puts it in the shorter listing of dual-fan AIOs.

Pump & Waterblock

While Asetek may be manufacturing the H20 1250, the design is 100% Antec, as there is literally no other all-in-one with a similar architecture. Instead of incorporating a pump over the waterblock, as is usually the case for liquid coolers, Antec has designed a waterblock that only features a fan controller, some USB enabled circuitry and an RGB LED. 

Antec H20 1250 - Coldplate

The cold-plate is of Asetek design, using a micro-fin channel system and a copper base not unlike Thermaltake’s Extreme Water 3.0.

Antec H20 1250 - Copper base

The waterblock has an extensive bundle of wiring, since fans / pump / USB header all come out at this end. 


Since the fans are connected into one unit, you will not be able to use aftermarket alternatives. Also worth noting is that the pump and fans have to run in tandem, so when you lower the fan speed, the pump also pushes the liquid at a lower speed as well.

The included MTBF fans are rated at over 50,000 hours of continuous use, so premature pump death due to faulty fan bearings should be a rare occurrence, but it is a possibility. In terms of performance, the fans are rated at a speed of up 2400RPM, 97.8CFM and 2.78mm of static pressure.


Since Asetek worked on H20 1250's, the waterblock and included accessories are similar to Thermaltake's. While the mounting bracket offers proper clearance, the radiator combo is actually thick and bulky enough to cause some problems while installing it in smaller sized enclosures.

Antec H20 1250 - Installed

As for the installation procedure, as I previously said, the installation procedure is similar to Water 3.0's:

1. Use the plastic backplate and insert the threaded tubes into the proper socket slot;
2. Push in until the an audible click is heard;
3. Attach the retention ring onto the waterblock;
4. Secure the waterblock onto the motherboard by using the four spring loaded bolts;
5. Connect the pump 4-pin connector to & the fans’ 4-pin connector to the appropriate header;

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