Tecomotive „tinyCWA“


  • Engine speed independent cooling
  • Integrated cooling fan controller
  • No more overheating at engine idle
  • No thermostat necessary
  • Quick and predictive control algorithm
  • Delayed shutdown

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An automotive controller for Pierburg’s (BMW) electric water pumps CWA200.

The Tecomotive “tinyCWA” is able to control the CWA200 electric water pump (eWP) in the appropriate manner.
It is suitable for cars or any other thing where smart cooling is required.

When activated the controller is measuring the current coolant temperature and the rate of increase with the connected temperature sensor.
With this data it then calculates the appropriate water flow and sends a signal to the pump where the internal
pump electronics then set it to the right speed.
This way you will always have the right pump speed for any circumstances.

We developed this product with very special attention to quality, operational safety, ease of use and a very nice appearance.

The compact and anodized aluminum case measures only 51x51x13mm. (2x2x1/2inches)

You can find more precise information about the operation, installation and use in the manual linked below.



Manual Tecomotive "tinyCWA" (pdf)



  • Simple to set up with only one rotary switch
  • Choose your favorite target temperature in six steps from 75°C to 100°C (167°F to 212°F)
  • LED display shows the current pump speed or rough coolant temperature
  • Compact and robust anodized aluminum case
  • Relay output for the radiator fan (recommend to use)
  • Delayed shutdown of the pump and the fan after ignition turned off
  • Manually control the pump speed (e.g. for bleeding or testing)



  • tinyCWA controller
  • Fuse holder
  • Fuses (15A/30A)
  • Connector 8 pin (controller)
  • Connector 4 pin (water pump)
  • Connector 2 pin (temperature sensor)
  • Temperature sensor with M12x1.5 thread size
  • Set of screws for controller mounting




The electronic water pump Pierburg CWA200

The Pierburg CWA200 was the first electronic water pump for line production introduced by BMW in 2004.
They are now widely available in used cars and the aftermarket and got many advantages over conventional mechanical pumps.
Some of which are the freedom of installation and the independence of engine revolutions. Also the pumps are very well built and with its brushless canned motor they are practical maintenance free.

You will find some more information on this in the manual linked above.


Part numbers (eWP):

7.00294.17.0 / 7.02478.40.0 / 7.00294.15.0 / 7.02851.20.8

11517586925 / 11517586924 / 11517563183 / 11517546994 / 11517596763 /
11517586929 / 11517586928 / 11517559272 / 11517583836 / 11517604027 /


We will gladly deliver you a new CWA200 for the price of 386 euros in addition to the controller.
Just write us an email in this matter.


Advantages of electronic water pumps:

The best benefit for aftermarket and motorsport application would be the freedom of installation and use.
You can mount the pump practically anywhere (yes even in the trunk) and it is completely independent of the engines revolutions.

Most of the cooling power is needed when the car is idling around in a complete standstill.
Sadly that’s the situation where a mechanical water pump got its least amount of power.
So most of the time a conventional pump is oversupplying the engine with coolant flow.

The eWP however can deliver the right amount of flow at any time it is needed.
(Only of course with the right controller that regulates the power in a smart and efficient way) ;-)