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Best CPU Reservoir For Custom Water Loops

Creating your custom water-cooled is a big step to take if you want to become a PC hardware enthusiast. A lot of elements play an important in creating the perfect custom loop. There are many components used in custom loops, out of which we will be talking about the best CPU reservoir products on the market.

If you are lucky enough to get your hands on hot GPUs such as the RTX 3080, you may also consider getting an RTX 3080 waterblock if you see fit. With all of that in mind, the important component is a decent reservoir for the loop. On a larger scale, a reservoir is a large lake used as a source of water supply. The same concept applies here, just on a smaller scale. A reservoir stores the water or coolant for your loop. A water pump handles the job of directing the flow of water.

A lot of patience and research goes into deciding a proper reservoir for your loop. This entirely depends on the case size, and how much space you want to fill. Fortunately, we’ve narrowed down the list for you.

The Best CPU Reservoir Options – Our Picks

#PreviewProduct NameAwardDetails
1Thermaltake Pacific DIY Reservoir/PumpBest Overall CPU Reservoir
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2Corsair Hydro Series XD5 ReservoirBest Looking CPU Reservoir
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3IronBuddy Water Cooling ReservoiBest Built CPU Reservoir
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4ZJchao Acrlyc Water TankBest Compact CPU Reservoir
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5BXQINLENX Water Pump TankBest Budget CPU Reservoir
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Product NameThermaltake Pacific DIY Reservoir/Pump
AwardBest Overall CPU Reservoir
Check Price
Product NameCorsair Hydro Series XD5 Reservoir
AwardBest Looking CPU Reservoir
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Product NameIronBuddy Water Cooling Reservoi
AwardBest Built CPU Reservoir
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Product NameZJchao Acrlyc Water Tank
AwardBest Compact CPU Reservoir
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Product NameBXQINLENX Water Pump Tank
AwardBest Budget CPU Reservoir
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Last Update on 2024-05-28 at 03:25 / Affiliate links / Images from Amazon Product Advertising API

A reservoir is necessary if you want to build a custom water cooling loop and connect it to your CPU waterblock. If you run a large system, perhaps you might want to get a larger reservoir. We also suggest getting a suitable water pump while you’re looking forward to building a custom water-cooled build. Check out some of our recommendations for the best CPU reservoir products as described below.

1. Thermaltake Pacific DIY Reservoir/Pump

Best Overall CPU Reservoir


  • Perfect for larger builds
  • Excellent construction
  • Strong D5 pump
  • 5-speed adjustability
  • Anti-vibration brackets


  • Lacks RGB lighting

Capacity: 300ML | Pump Included: Yes | RGB: None | Material: POM+PMMA

Thermaltake is one of the top brands when it comes to high-performance watercooling. Subsequently, we can expect high-end performance and great build quality from them. Thankfully, Thermaltake is yet to disappoint us on this part. The Pacific DIY Adjustable D5 Pump/Reservoir combo is proof of that.

Helpful Roundup: 5 Best PC Cases for Custom Water Cooling

On this list, you’ll notice that some of these reservoirs come alongside the pump. This is not uncommon and seems to be an ongoing trend. The water cooling community largely follows trends like this anyway. However, it’s quite an efficient solution. You don’t have to separately set up the pump or the reservoir. That’s because Thermaltake does all the work for you.

This Pacific DIY reservoir has a capacity of 300ml or 0.3 liters. That’s more than enough for most full-tower cases. It comes with its own bracket, so it saves us a bit of hassle. Because of the bracket, you can set this up either horizontally or vertically. That will come down to personal preference. It uses the standard G1/4″ threads. Because of that, most standard fittings should work just fine.

The D5 pump is excellent, and it’s also highly regarded as one of the best. It has 5-speed adjustability and can pump at a rate of 1135L/hr. That type of performance and speed gives excellent flexibility and versatility. It even has a noise-reducing aluminum housing. Apart from that, you get 2 years of warranty straight from Thermaltake.

The tank is made up of heat-resistant acrylic. We’re not worried about build quality in the least. The only thing lacking here is RGB, which may or may not matter to you. All of these features top the Thermaltake Pacific as the best overall CPU reservoir on the no.1 spot on our list.

2. Corsair Hydro Series XD5 Reservoir

Best Looking CPU Reservoir


  • Perfect flow balance
  • Eyecatching aesthetics
  • Easy to install
  • Near silent operation


  • Proprietary Corsair lighting control

573 Reviews

Capacity: 330ml | Pump Included: Yes | RGB: Yes | Material: Acrylic

Corsair is known for its excellent PC components and peripherals. They are one of the top manufacturers when it comes to mice, keyboards, headsets, and much more. Recently, they have been trying their hand at making custom water cooling components. The XD5 RGB Pump/Reservoir is an excellent first attempt.

The pump in here is the premium Xylem D5 PWM pump. It delivers an impeccable flow balance for a custom loop. We are huge fans of the design of this thing. The black exterior combined with the industrial-esque design gives it a unique look. It easily looks twice as expensive than it is.

It has a capacity of 330ml, which is surprising for the size. However, once you take a closer look, it is apparent that this reservoir is big in the depth dimension. This is not something we see every day, as reservoirs larger than 300ml are usually bigger. The Corsair XD5 is comically small for its capacity, and we mean that in the best way possible.

Of course, this can’t be a Corsair product without some RGB. It has ten top-mounted RGB LEDs that give some flair to the design of this thing.  The lighting can be customized if combined with a Corsair RGB controller. We wish Corsair would open the door to third-party controllers at this point.

It has a rubberized mounting system, which reduces vibrations and noises. After all, want your custom loop to be quiet and look good in the end. Corsair even includes a 24-pin PSU jumper bridge, so you can drain and fill your system with ease. They have thought about everything here, that’s why we recommend it highly as the best looking CPU reservoir.

3. IronBuddy Water Cooling Reservoir

Best Built CPU Reservoir


  • Stands out from the crowd
  • Superb construction
  • Versatile and flexible
  • Perfect for ATX systems


  • No plugs for ports

55 Reviews

Capacity: 300ml | Pump Included: No | RGB: None | Material: PMMA

A lot of water cooling reservoirs can end up looking the same. Sure, water cooling looks unique in and of itself. However, when everyone has the same type of reservoir, you can’t help but notice the similarities. People often have the same bends as well, so how do you stand out from the crowd?

Well, IronBuddy hopes to answer that question. Their answer lies in the form of the IronBuddy Water Cooling Tank Reservoir. With an extremely approachable name like that, we can expect this to be a great companion to our custom loop. If you think the same, well you aren’t wrong in the slightest.

Related Read: AIO vs Custom Water Loop: Which should you go for?

Let’s talk about the materials first. The tank uses aluminum construction, and the cylindrical body uses PMMA. The commercial name for this thermoplastic is acrylic. However, it’s not the same thing. We won’t go into details, or we’ll be sitting here all day. Just know that this thing is durable. It uses standard G1/4″ connecting threads.

It has six of those thread holes, which means it’s easy to find a flexible way to put your build together. Versatility and flexibility are two things we love about this reservoir. The cylindrical tank is more than adequate for water cooling. The Helix or DNA shape adds to the uniqueness of this reservoir. It isn’t functional in a useful way, but it looks quite different.

Combine that with the aluminum finish, perfect size for ATX cases, and durability, and we have ourselves the best built CPU reservoir on our list. The only downside is that it doesn’t come with any plugs for the holes you don’t want to use. That’s a major oversight for such a great reservoir.

4. ZJchao Acrlyc Water Tank

Best Compact CPU Reservoir


  • Unconventional design
  • Perfect for smaller systems
  • Affordable price


  • No mounting hardware
  • Not compatible with some tubes

Capacity: 200ml | Pump Included: No | RGB: None | Material: Acrylic

Just because you have a small mATX case or a much more compact mini-ITX case doesn’t mean you have to miss out. In fact, many smaller cases that have a custom loop end up looking even better. However, it’s considerably harder to manage a loop inside a small case. It is certainly doable, but we won’t lie and say that it is easy.

With that said, the ZJchao Acrylic Water Tank can make things a bit easier in your life. It’s an acrylic tank, so you can’t go wrong there. It’s not going to leak, so that’s most of its job fully accomplished. You can use standard G1/4″ fittings with those threads. The construction is surprisingly solid overall. While this is intended for smaller cases, it’s still an adequate size for an average system.

However, it’s not all roses with this reservoir. First off, it doesn’t come with any mounting hardware. That’s a bit disappointing considering the unconventional square shape. The corners are quite sharp, so be careful with it. Also, the holes are a bit small if your tubes have an inner diameter of more than 10mm.  But why does it earn a spot here then?

Helpful Guide: Custom Water Cooling: Soft tubing vs Hard Tubing

Well, the first reason is that the right person could find the perfect use for this. If you are looking for something unconventional for a small case, this is it. The second reason is the price, as this is one of the more affordable and the best compact CPU reservoir products on this list.

5. BXQINLENX Water Pump Tank

Best Budget CPU Reservoir


  • Exceptional value
  • Long lifetime
  • Lots of accessories


  • Sup-par pump performance
  • Looks awkward in ATX builds
  • Quality control issues

Capacity: 86ml | Pump Included: Yes | RGB: None | Material: POM

BXQINLENX is a Chinese brand that makes a lot of custom water cooling components. While the brand name isn’t easy to pronounce, the products themselves are more approachable. Their 86ml also happens to be the best value on this list, and it’s perfect for an entry-level loop.

Related Read: 5 Best CFM Case Fans for Your Gaming PC

This reservoir from BXQINLENX is another one of those that uses a pump combo. It has a capacity of 86ml and pumps at a speed of 158.5GPH (600L/H). This reservoir is perfect for the average custom closed loop. Apart from that, it uses standard G/14″ threads both for the input and output. The working life is rated at about 50000 hours.

It consumes 19W of power and is rated at 12V of DC voltage. It has a ceramic shaft and ceramic housing along with a length of 110mm. Furthermore, prevents any hard particles from entering the pumps. Other than that, it has ceramic bearings, a graphite sleeve, and a very quiet operation. An interesting part about this one is that it is submersible in water.

While this is a good entry-level product, it certainly isn’t the best pump reservoir combo and we won’t recommend it for higher-end builds. This is mainly due to quality control issues. The provided barbs aren’t that great either. It does get the job done, but know that it doesn’t exactly deliver the best performance. Hence the reason we call this the best budget CPU reservoir.



Ace Luke

Ace Luke is a Washington Accord certified computer engineer with a keen interest in gaming and reviewing computer hardware since childhood.