
Best selling Water cooling pumps from Watercool
Here you’ll find the best Water cooling pumps from Watercool. The ranking is based on the best-selling products from this brand within the category. In addition to sales volume, factors such as availability, pricing, and overall customer relevance also influence the order. For each product, we include a short description and the most important highlights from customer reviews, giving you a quick overview of the most popular Watercool options. This page always stays fresh and updates automatically.
1. Watercool PUM WCP D5-PWM
The PUM WCP D5-PWM is a state-of-the-art DC pump based on the innovative ball motor principle developed by Laing. This pump is characterized by its durable construction and quiet operation, as the only moving part is a spherically shaped, permanent magnetic rotor/impeller unit mounted on a wear-resistant ceramic bearing ball. By eliminating conventional shaft bearings, the risk of bearing play and operational noise is minimized. The pump is designed as a wet runner, meaning that the conveyed medium is used for lubrication and cooling of the bearing, making separate maintenance unnecessary. The corrosion-resistant materials ensure high resistance to various liquids, while the permanent magnet motor technology provides high efficiency and reliable performance. The stepless speed control allows for flexible adjustment of hydraulic performance and electrical power consumption, making the PUM WCP D5-PWM an ideal choice for demanding water cooling systems.
- Ball motor principle for quiet operation and high efficiency
- Self-adjusting bearing lubricated by the conveyed medium
- Corrosion-resistant materials for long lifespan
- Stepless speed control for flexible performance adjustment
- Reliable start-up even after prolonged downtime.

2. Watercool HEATKILLER DDC pump attachment X3
The Watercool HEATKILLER MULTITOP DDC X3 pump attachment allows you to easily integrate your DDC pump into a water circuit. The pump is mounted on the top, saving space and ensuring uninterrupted circulation of the cooling water.
It is made from a 30 mm thick acetal block and features flow-optimized channels to ensure that enough water flows through your system at all times. Additionally, it has been designed to maintain minimal back pressure, preventing damage to your pump.
If more pumping power is needed, you can mount two additional pumps on the HEATKILLER DDC pump attachment X3, tripling the pumping capacity in a serial arrangement.
Technical details:
- Dimensions: 186 x 62 x 30 mm (L x W x H)
- Color: Black
- Material: Acetal
- Connections: 3x G1/4 inch
- Pump compatibility: DDC
- Weight: 380 g
- Delivery includes:
1x Watercool HEATKILLER DDC pump attachment X3
1x Closure screw
1x Mounting material
Note: Caution! Use only with clear, transparent water cooling liquids. Particles and additives in pastel liquids can clog water cooling products such as radiators, pumps, coolers, and hoses, causing permanent damage. This may also void the manufacturer's warranty. Ensure the correct orientation of the pump before operation.

3. Watercool Heatkiller D5-TOP pump attachment
The HEATKILLER® D5-TOP is the ideal addition for D5 pumps. It features four G ¼“ threaded connections for integration into the cooling circuit. A variety of standard fittings can be screwed into these connections. Unused threaded connections can be sealed with the included closure plugs.
The channels are optimized for flow, allowing the pump to operate more efficiently than with the original pump cover.
A stainless steel bracket is included in the package. This can also be mounted rotated by 90°, making installation in tight cases easier. Additionally, it can be used as a stand. A rubber decoupling is available separately.
The material used is a high-quality industrial plastic (POM). The plates are made of polished stainless steel.

4. Watercool MO-RA3 420 D5 dual pump attachment
This module, made from 2 mm thick stainless steel, is designed to securely attach the Watercool D5-Dualtop in just a few steps. It allows for the D5-Dualtop to be mounted together with the HEATKILLER Tube expansion tank on the MO-RA3 420. To prevent vibrations and oscillations, the construction is mounted with an elastic vibration-damping unit on the mounting plate. The module has been developed to ensure high compatibility. Therefore, installing a HEATKILLER Tube in the 150 or 200 format can also be done without any issues. The Watercool Industrial Line is characterized by a simple design, maximum functionality, high performance, and robust materials. Technical specifications: Material: stainless steel, material thickness: 2 mm. Delivery includes: Watercool D5-Dualtop mounting module. Compatibility: Watercool MO-RA3 420 Industrial Line, Watercool MO-RA3 420 LT, Watercool MO-RA3 420 Pro, HEATKILLER Tube 150/200 (in conjunction with Basic Mounting Kit).

5. Watercool HEATKILLER DDC pump attachment X2
The Watercool Heatkiller Multitop DDC X2 allows you to easily integrate your DDC pump into a water circuit. The pump is mounted in the top, which not only saves space but also ensures a continuous flow of coolant.
It is made from a 30 mm thick acetal block and features flow-optimized channels that ensure sufficient water flows through your system at all times. Additionally, it has been designed to maintain minimal back pressure, preventing damage to your pump.
If more pumping power is needed, you can mount an additional pump in the Heatkiller DDC pump attachment X2, effectively doubling the pump performance in a serial arrangement.
Technical details:
- Dimensions: 125 x 62 x 30 mm (L x W x H)
- Color: Black
- Material: Acetal
- Connections: 3x G1/4 inch
- Pump compatibility: DDC
- Weight: 250 g
- Delivery includes:
1x Watercool Heatkiller DDC pump attachment X2
1x Closure screw
1x Mounting material
Note: Caution! Use only with clear, transparent water cooling liquids. Particles and additives in pastel liquids can clog and permanently damage water cooling products such as radiators, pumps, coolers, and hoses. This may also void the manufacturer's warranty. Ensure the correct orientation of the pump before operation.

6. Watercool PUM WCP D5
The PUM WCP D5 from Watercool is a state-of-the-art DC pump based on the innovative spherical motor principle developed by Laing. This pump is characterized by its durable construction and quiet operation, as the only moving part is the spherically shaped rotor/impeller unit, which is mounted on an ultra-hard ceramic bearing ball. This minimizes the risk of bearing play and operational noise, making the pump ideal for applications where a quiet environment is required. The WCP D5 is a wet runner pump that self-lubricates and cools, eliminating the need for separate maintenance. Its corrosion-resistant materials ensure a long lifespan, while the permanent magnet motor technology provides high efficiency. The stepless speed control allows for flexible adjustment of hydraulic performance and electrical power consumption, making the pump a versatile solution for various cooling applications.
- Spherical motor principle for quiet operation and high reliability
- Self-adjusting bearing lubricated by the pumped medium
- Corrosion-resistant materials for long lifespan
- Stepless speed control for flexible performance adjustment
- High efficiency through permanent magnet motor technology.

7. Watercool Pump 290 Kabel
WATERCOOL PUMP 290 – Premium Connection Cable for HEATKILLER D5
The WATERCOOL PUMP 290 is the centerpiece for intelligent pump control in your system. This premium connection cable enables seamless integration of your HEATKILLER D5 PWM pump with an Active or Passive Control Unit.
Maximum compatibility and innovation: WPI standard. The cable is based on the innovative WPI (WATERCOOL Pump Interface) standard and ensures error-free signal transmission.
System integration: Designed for perfect communication between the pump and control unit (Active/Passive Control).
High-end craftsmanship: Robust connectors and high-quality wires ensure maximum durability in your custom loop.
Important note: This cable is exclusively compatible with a HEATKILLER D5 PWM pump in combination with a Passive or Active Control.
Delivery includes: 1x WATERCOOL PUMP 290 cable.

8. Watercool Pump 350 Kabel
WATERCOOL PUMP 350 Connection Cable – Maximum Control for Your D5. Bring order and full control to your custom loop. Our premium connection cable has been specifically designed to seamlessly integrate your HEATKILLER D5 PWM pump into your system. Highlights at a glance: Innovative WPI Standard: The cable is based on the future-proof WPI WATERCOOL Pump Interface (Wpi) standard for clean communication between pump and control. Seamless Integration: Allows full utilization of Active or Passive Control modules. Plug & Play: Custom-fit connectors ensure a secure connection without cable clutter. Important Compatibility Note: This cable is exclusively for use with a HEATKILLER D5 PWM pump in combination with a Passive or Active Control. Please check your existing setup before purchasing. Package includes: 1x WATERCOOL PUMP 350 Connection Cable.
