6 Best Alternatives to the Alphacool ES Reservoir 2U (2026)
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You may be searching for alphacool es reservoir 2u alternatives if you need a different form factor or brand. The original Alphacool ES Reservoir 2U DDC Combo is designed specifically for 2U server racks. It measures 62 x 80 x 60 mm and includes eleven G1/4 connections. This compact design fits vertical spaces strictly. However, you might want a standard PC case solution. You may also prefer a different material or a larger reservoir capacity. Some builders need a 1U option instead. Others want a complete kit rather than just a reservoir.
We selected these 6 options because their specifications overlap with the original product. All listed items support DDC pumps. They provide dedicated mounting solutions for liquid cooling loops. The list includes rack-mount units like the 1U version. It also features standard reservoirs like the Phanteks Glacier. You will find distro plates for specific cases too. These alternatives cover various build styles. They offer different sizes and materials. You can choose based on your case type. This guide helps you find the right fit.
How each alternative compares
Thermaltake Pacific C240 Copper Hard Tube Kit
The Thermaltake Pacific C240 Copper Hard Tube Kit replaces the standalone reservoir with a complete loop bundle. It includes a 240mm copper radiator, CPU block, and tubing for DDC pumps. This option suits builders who want an all-in-one package rather than individual rackmount components. You gain a full cooling solution but lose the compact 62 x 80 x 60 mm footprint. The dimensions are significantly larger at 20.7 x 16.1 x 9.61 inches. It is best for complete DDC custom loop builds where space is less constrained than in a 2U server rack.
Phanteks Glacier R220C Acrylic Reservoir
The Phanteks Glacier R220C Acrylic Reservoir offers a 200 ml chamber with digital RGB lighting. It mounts to standard PC fan brackets instead of requiring a 2U server bay. This provides flexible installation options for standard cases. The dimensions are 3.15 x 8.66 x 1.34 inches, which differs from the original's 2.44 x 3.15 x 2.36 inches. You get reliable sealing and bubble management without dedicated rack-mount hardware. It is ideal for DDC loops that do not need server rack compatibility. The acrylic material and lighting add aesthetic value absent in the original black reservoir.
Alphacool ES Reservoir 1U DDC Pump Top
The Alphacool ES Reservoir 1U DDC Pump Top is a lower-profile alternative for 1U server racks. It measures 3.94 x 2.67 x 1.57 inches, fitting into tighter vertical spaces than the 2U version. It provides seven G1/4 connection options in a 40 mm form factor. You sacrifice some port versatility compared to the original's eleven connections. The weight is lighter at 2.57 ounces versus 3.28 ounces. This option is best for 1U server environments where space is extremely limited. It maintains DDC pump compatibility while offering a more compact footprint for dense builds.
Bykski O11 Dynamic XL Distro Plate with DDC Pump
The Bykski O11 Dynamic XL Distro Plate is tailored for the LIAN LI O11 Dynamic XL case. It integrates a DDC pump with a dedicated channel layout for streamlined tube routing. The material is PMMA with 5v addressable RGB lighting. Dimensions are 16.7 x 5.67 x 1.32 inches, which is much larger than the original. Radiator thickness is capped at 30mm, a strict limitation not present in the original design. This solution eliminates separate reservoir mounting for specific case owners. It suits builders who want organized tubing and integrated pumping within that specific full-tower chassis.
Bykski InWin 925 Distro Plate with DDC Pump
The Bykski InWin 925 Distro Plate provides a dedicated acrylic routing plate with a built-in DDC pump. It is designed specifically for InWin 925 systems. The dimensions are 14.9 x 5.24 x 1.32 inches, significantly larger than the original reservoir. It features 5v addressable RGB lighting and PMMA construction. This option eliminates separate reservoir mounting but demands strict adherence to chassis and radiator thickness limitations. It is best for InWin 925 builds requiring integrated DDC pumps. You gain a tailored solution for this specific case but lose the universal 2U rack compatibility of the original.
Bykski Phanteks Evolv Shift X Distro Plate
The Bykski Phanteks Evolv Shift X Distro Plate offers a pre-assembled solution for the Phanteks Entho Evolv Shift X case. It includes a DDC pump with armor and 5v addressable RGB lighting. The material is PMMA in a transparent finish. Dimensions are 12 x 6.1 x 1.24 inches, which is larger than the original. It weighs 10 pounds, much heavier than the 3.28 ounce original. This option suits builders who want organized tubing without custom fabrication. It provides a clean look for that specific case but lacks the 2U server rack compatibility and compact form factor of the original.
Quick picks
Our 7 picks
Alphacool ES Reservoir 2U DDC Combo
Best for: 2U server rack DDC liquid cooling loops
- Thread Size
- G1/4"
- Pump Compatibility
- DDC
- Dimensions
- 3.15 × 2.44 × 2.36 inches
- Weight
- 3.28 ounces
The Alphacool ES 2U is a compact reservoir and DDC pump top combo built specifically for 2U server racks. It measures 62 by 80 by 60 mm and weighs 3.28 ounces. With 11 G1/4-inch threaded ports, you gain extensive routing flexibility inside tight chassis. This unit suits you if you need a dedicated DDC-compatible cooling component engineered for low-profile rackmount server enclosures.
Pros
- Features 11 G1/4-inch connection ports
- Integrated pump top compatible with DDC pumps
- Designed for 2U server rack enclosures
- Compact dimensions of 62 x 80 x 60 mm
Cons
- Compatible only with DDC pump models
- Compact 2.36-inch height restricts total reservoir capacity
Good fit if
- You need a reservoir and pump top combo designed for 2U server racks.
- You plan to use a DDC pump in your liquid cooling loop.
- You require multiple G1/4 connection options for flexible tubing routes.
Skip if
- You use a D5 pump or any non-DDC pump format.
- You need a standard cylindrical reservoir for a large tower chassis.
Verdict: Alphacool ES 2U DDC Reservoir and Pump Top delivers high port versatility and compact dimensions for 2U server builds. It provides a dedicated DDC-ready mounting solution where vertical space is strictly limited.
Thermaltake Pacific C240 Copper Hard Tube Kit
Best for: complete DDC custom loop builds
- Radiator Size
- 240mm
- Socket Compatibility
- LGA1700
- Lighting
- RGB
- Material
- Copper
- Pump Compatibility
- DDC
- Size
- 240mm Radiator
View on Amazon: Thermaltake Pacific C240 Copper Hard Tube Kit
You get an entire custom loop kit centered on a PR15-DDC pump and reservoir combo rather than a standalone reservoir. It includes a 240mm slim copper radiator measuring 27mm thick with 17 fins per inch, a CPU water block, PETG tubing, and C-Pro compression fittings. You should choose this package if you need a complete DDC-driven liquid cooling system with matched parts.
Pros
- PR15-DDC pump and reservoir combo included
- Slim 27mm copper radiator with 12 flat tubes and 17 FPI
- Includes CPU water block, PETG hard tubing, and coolant
- C-Pro compression fittings feature four built-in O-rings
Cons
- Requires separate add-on kit for LGA1700 socket support
- Provides a complete kit rather than a standalone 2U reservoir
Good fit if
- You need an entire custom cooling package centered on a DDC unit.
- You want a slim 27mm copper radiator with matched compression fittings.
Skip if
- You only require an individual reservoir body for an existing setup.
- You need out-of-the-box LGA1700 mounting hardware included in the box.
Verdict: Thermaltake Pacific C240 DDC Liquid Cooling Kit replaces standalone reservoirs with a complete DDC loop bundle containing a slim copper radiator, CPU block, and tubing. It suits builders seeking an all-in-one component package rather than an individual rackmount reservoir.
Phanteks Glacier R220C Acrylic Reservoir
Best for: DDC loops mounting to PC fan brackets
- Lighting
- Digital-RGB
- Material
- Acrylic
- Reservoir Capacity
- 200 ml
- Pump Compatibility
- DDC
- Dimensions
- 3.15 × 8.66 × 1.34 inches
The Phanteks Glacier 220mm DDC Reservoir is an acrylic combo unit designed for standalone DDC pumps. It features a 200 ml capacity, integrated 3-pin Digital-RGB lighting, and Viton rubber O-rings for liquid containment. You can mount it vertically or horizontally using the included 120mm and 140mm fan bracket. This reservoir suits you if you need a bubble-reducing DDC pump top that attaches to standard fan mounts.
Pros
- Universal 120mm and 140mm fan bracket supports vertical or horizontal mounting
- Integrated 3-pin Digital-RGB lighting syncs with compatible cases and motherboards
- Viton rubber O-ring provides leak sealing and durability
- Internal tube layout designed to minimize air bubble formation
Cons
- DDC pump is not included
- Fluid capacity is restricted to 200 ml
- Incompatible with D5 pump formats
Good fit if
- You need to mount a DDC reservoir combo directly to 120mm or 140mm fan slots.
- You want integrated 3-pin Digital-RGB lighting inside your reservoir.
- You require flexible horizontal or vertical installation options.
Skip if
- You need a reservoir that includes an integrated pump out of the box.
- You require more than 200 ml of fluid volume in the reservoir.
- You are building around a D5 pump rather than a DDC pump.
Verdict: Phanteks Glacier 220mm DDC Reservoir pairs flexible fan mounting with a 200 ml chamber and addressable lighting for custom DDC loops. It delivers reliable sealing and bubble management without needing dedicated rack-mount bays.
Alphacool ES Reservoir 1U DDC Pump Top
Best for: 1U server racks using DDC pumps
- Thread Size
- G1/4"
- Pump Compatibility
- DDC
- Dimensions
- 3.94 × 2.67 × 1.57 inches
- Weight
- 2.57 ounces
This reservoir and pump top combo from Alphacool fits tight rack setups. It measures 40 mm high to fit 1U server enclosures. You get an integrated DDC pump mount and seven G1/4 threaded ports for flexible routing. Its black body weighs 2.57 ounces. It suits your build if you need maximum port routing flexibility within a compact rack footprint instead of a taller 2U configuration.
Pros
- Low-profile 40 mm height fits 1U rack enclosures
- Provides 7 G1/4 threaded connection ports
- Integrated DDC pump top saves loop space
- Lightweight construction at 2.57 ounces
Cons
- Restricted to DDC pump compatibility only
- Solid black body lacks a clear fluid-level window
Good fit if
- You build liquid cooling inside a low-profile 1U server chassis.
- You mount a DDC pump directly to the reservoir.
- You need seven G1/4 connection options to route tubing in cramped spaces.
Skip if
- You run a D5 pump rather than a DDC unit.
- You require a transparent reservoir body to check coolant volume.
Verdict: Alphacool ES 1U DDC Reservoir Pump Top delivers seven G1/4 connection options in a low-profile 40 mm form factor. It provides a compact DDC-based cooling loop base for 1U server environments.
Bykski O11 Dynamic XL Distro Plate with DDC Pump
Best for: LIAN LI O11 Dynamic XL custom loops
- Lighting
- 5v Addressable RGB
- Material
- PMMA
- Pump Compatibility
- DDC
- Dimensions
- 16.7 × 5.67 × 1.32 inches
- Weight
- 10 pounds
View on Amazon: Bykski O11 Dynamic XL Distro Plate with DDC Pump
This distribution plate replaces standard cylindrical or rackmount reservoirs with a dedicated acrylic panel tailored for the LIAN LI O11 Dynamic XL chassis. Measuring 16.7 inches long and 1.32 inches thick, it mounts an integrated DDC pump with armor heatsink and features 5V addressable RGB lighting. You get direct routing for parallel tubing lines, provided your installed radiators do not exceed 30mm in thickness.
Pros
- Integrated DDC pump mount with armor heatsink
- Built-in 5V addressable RGB LED strip
- Full PMMA acrylic body pre-assembled with mounting hardware
- Enables parallel tubing runs to simplify loop layouts
Cons
- Restricted exclusively to the LIAN LI O11 Dynamic XL case
- Installed radiator thickness cannot exceed 30mm
- Heavy unit weighing 10 pounds
Good fit if
- You build inside a LIAN LI O11 Dynamic XL case.
- You plan to run an inline DDC pump setup with 5V addressable RGB lighting.
- You want parallel tubing runs without separate reservoir mounts.
Skip if
- You use any chassis other than the LIAN LI O11 Dynamic XL.
- You need radiators thicker than 30mm installed alongside it.
Verdict: Bykski O11 Dynamic XL DDC Distro Plate offers a tailored DDC reservoir solution for builders working inside this specific full-tower case. Its dedicated channel layout streamlines tube routing, though radiator thickness is strictly capped at 30mm.
Bykski InWin 925 Distro Plate with DDC Pump
Best for: InWin 925 builds requiring integrated DDC pumps
- Lighting
- 5v Addressable RGB
- Material
- PMMA
- Pump Compatibility
- DDC
- Dimensions
- 14.9 × 5.24 × 1.32 inches
- Weight
- 10 pounds
This Bykski distribution plate replaces traditional reservoirs with a dedicated PMMA acrylic manifold tailored for the InWin 925 chassis. It measures 14.9 by 5.24 by 1.32 inches and integrates an armored DDC pump alongside a 5V addressable RGB LED strip. It suits you if you want streamlined, parallel tubing runs and built-in loop power without mounting a standalone cylindrical reservoir or server-rack unit inside your build.
Pros
- Includes an integrated DDC pump with armor heatsink
- Features a built-in 5V addressable RGB lighting strip
- Constructed from transparent PMMA acrylic
- Comes pre-assembled with mounting hardware included
Cons
- Engineered strictly for the InWin 925 chassis
- Installed radiator thickness cannot exceed 30mm
- Heavy assembly weighing 10 pounds
Good fit if
- You build inside an InWin 925 computer case.
- You want an integrated DDC pump and reservoir unit with 5V A-RGB lighting.
- You plan to run radiators that are 30mm thick or less.
Skip if
- You use any chassis other than the InWin 925.
- You require radiators thicker than 30mm in your cooling setup.
- You need a universal server chassis or rackmount reservoir format.
Verdict: Bykski InWin 925 Distro Plate with DDC Pump provides a dedicated acrylic routing plate with built-in pump power tailored specifically for InWin 925 systems. It eliminates separate reservoir mounting while demanding strict adherence to chassis and radiator thickness limitations.
Bykski Phanteks Evolv Shift X Distro Plate
Best for: Phanteks Entho Evolv Shift X owners
- Lighting
- 5v Addressable RGB
- Material
- PMMA
- Pump Compatibility
- DDC
- Dimensions
- 12 × 6.1 × 1.24 inches
- Weight
- 10 pounds
This Bykski distro plate is engineered specifically for the Phanteks Entho Evolv Shift X case. It features a transparent PMMA body measuring 12 by 6.1 inches. The unit includes a DDC pump with an armor heatsink and 5V addressable RGB lighting. It weighs 10 pounds and supports radiators up to 30mm thick. You get a pre-assembled unit that simplifies loop layout with minimal tubing runs.
Pros
- Includes a DDC pump with armor heatsink
- Features 5V addressable RGB lighting
- Transparent PMMA construction
- Pre-assembled for quick installation
Cons
- Designed exclusively for the Phanteks Entho Evolv Shift X case
- Heavy at 10 pounds
- Radiators must not exceed 30mm thickness
Good fit if
- You own a Phanteks Entho Evolv Shift X case
- You want a pre-assembled DDC pump setup
- You prefer minimal tubing runs
Skip if
- You use a case other than the Phanteks Entho Evolv Shift X
- You need a pump with a digital display
- You require support for radiators thicker than 30mm
Verdict: Bykski Distro Plate for Phanteks Entho Evolv Shift X offers a clean, pre-assembled solution for owners of that specific case. It suits builders who want organized tubing and integrated DDC pumping without custom fabrication.
Specifications side by side
| Spec | Alphacool ES Reservoir 2U DDC Combo | Thermaltake Pacific C240 Copper Hard Tube Kit | Phanteks Glacier R220C Acrylic Reservoir | Alphacool ES Reservoir 1U DDC Pump Top | Bykski O11 Dynamic XL Distro Plate with DDC Pump | Bykski InWin 925 Distro Plate with DDC Pump | Bykski Phanteks Evolv Shift X Distro Plate |
|---|---|---|---|---|---|---|---|
| Radiator Size | not specified | 240mm | not specified | not specified | not specified | not specified | not specified |
| Socket Compatibility | not specified | LGA1700 | not specified | not specified | not specified | not specified | not specified |
| Lighting | not specified | RGB | Digital-RGB | not specified | 5v Addressable RGB | 5v Addressable RGB | 5v Addressable RGB |
| Material | not specified | Copper | Acrylic | not specified | PMMA | PMMA | PMMA |
| Reservoir Capacity | not specified | not specified | 200 ml | not specified | not specified | not specified | not specified |
| Thread Size | G1/4" | not specified | not specified | G1/4" | not specified | not specified | not specified |
| Pump Compatibility | DDC | DDC | DDC | DDC | DDC | DDC | DDC |
| Size | not specified | 240mm Radiator | 200 ml | not specified | DDC Pump With Armor | DDC Pump With Armor | DDC Pump With Armor |
| Dimensions | 3.15 × 2.44 × 2.36 inches | 20.7 × 16.1 × 9.61 inches | 3.15 × 8.66 × 1.34 inches | 3.94 × 2.67 × 1.57 inches | 16.7 × 5.67 × 1.32 inches | 14.9 × 5.24 × 1.32 inches | 12 × 6.1 × 1.24 inches |
| Weight | 3.28 ounces | not specified | not specified | 2.57 ounces | 10 pounds | 10 pounds | 10 pounds |
| Color | Black | not specified | Black | Black | not specified | not specified | Transparent |
| Model | 15376 | CL-W242-CU12SW-A | PH-R220C_02 | 15377 | not specified | not specified | not specified |
If you require standard server heatsinks, review dynatron k555 2u active cooler alternatives for your chassis space requirements.
Frequently asked questions
Can I use these alternatives in a standard PC case instead of a server rack?
Yes, several options work well in standard cases. The Phanteks Glacier R220C mounts to PC fan brackets and includes a 200 ml chamber. The Bykski distro plates are designed for specific full-tower cases like the O11 Dynamic XL. These provide dedicated DDC mounting without needing rack bays.
Do all these alternatives support DDC pumps?
Yes, every product listed is compatible with DDC pumps. The Alphacool ES 1U and 2U models are built specifically for DDC. The Thermaltake kit and Phanteks reservoir also target DDC loops. The Bykski distro plates come with integrated DDC pumps and armor for direct installation.
Which option is best if I need a complete loop kit?
The Thermaltake Pacific C240 Copper Hard Tube Kit is the best choice for a complete bundle. It replaces standalone reservoirs by including a 240mm copper radiator, CPU block, and tubing. This suits builders seeking an all-in-one package rather than purchasing individual components for a custom DDC loop.
Are there smaller alternatives for 1U server racks?
Yes, the Alphacool ES Reservoir 1U DDC Pump Top is designed for 1U environments. It measures 40 mm in height and offers seven G1/4 connection options. This compact form factor provides a reliable DDC-based cooling loop base for servers with strict height limitations.
Which reservoir has the largest fluid capacity?
The Phanteks Glacier R220C Acrylic Reservoir features a 200 ml chamber. This capacity helps with bubble management and reliability in custom DDC loops. Other options like the Bykski distro plates integrate the pump directly, while the Thermaltake kit focuses on the radiator and block rather than reservoir volume.
Do the Bykski distro plates include lighting?
Yes, all three Bykski distro plates feature 5v Addressable RGB lighting. They are made from PMMA material and include a DDC pump with armor. The transparent version is available for the Phanteks Evolv Shift X, while other models fit the InWin 925 and O11 Dynamic XL cases.
What is the main difference between the Alphacool ES 1U and 2U models?
The primary difference is the form factor and mounting space. The 2U model measures 60 mm in height, while the 1U model is only 40 mm tall. Both support DDC pumps, but the 1U version offers seven G1/4 connections in a lower-profile design for tighter server racks.