Pierburg "CWA400“ (LIN version)

Pierburg's electric water pump in the increased capacity range.

  • Robust and innovative design
  • Brushless canned motor
  • Integrated variable speed controller
  • Controllable via PWM
  • Reliable and maintenance free
  • High delivery rates

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Since around March 2024, the CWA400 only supports control via LIN bus.
Pierburg is now installing new internal electronics, which can no longer be controlled via PWM.
For the time being this pump is therefore no longer compatible with our tinyCWA!
We are currently working on a variety of solutions for this.

However, the simple on/off mode of that pump still works.
To use it without a controller, you must connect it as follows:
Pin 1: 12V / Pin 2: GND / Pin 3: 12V / Pin 4: GND

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Pierburg CWA400 (LIN version)

The CWA400 is the next development stage of the very successful principle the CWA200 used.
(A brushless and fully canned motor for instance)
This pump is supplying more than double the hydraulic performance at nearly the same dimensions.
Suitable mainly for engine cooling in combustion engine vehicles.


  • Name: "Pierburg CWA400"
  • Operation voltage: 8-16 volts
  • Weight: approx. 2.15 kg
  • Current consumption: 35.5A (36.3A max.)/ (approx. 0.2mA in standby mode)
  • Nominal diff. pressure: 0.85 bar *
  • Flow rate: approx. 150l/min @ 0.85bar / 220l/min @ 0.55bar
  • Speed: approx. 5900 rpm
  • Temperature range: -40°C – 128°C (water) / -40°C – 140°C (ambient)
  • Protection: IP67

Part numbers:

  • Pierburg: 7.03665.66.0
  • BMW: 11517604027 / 11518625097 / 11518635089


CWA400 Datasheet EN (pdf)

3D CAD files:
CWA400 3D CAD (zip)

Technical drawing:


Flow rate:





* Pump pressure is not the same as the system pressure.
Those pumps can of course be used in normal automotive cooling systems with system pressures
in the range of 0.8 to 1.2 bar for instance.
The pump pressure or differential pressure expresses the ´resistance´ of which the pump has to work against.
Tip: A mechanical thermostat is responsible for about half of that resistance. (in most cars)