Pierburg CWA400 Brushless Water Pump 40mm OD - 12v
The Pierburg Electrical CWA coolant pumps make a significant contribution to emission control on modern engine designs. A delivery rate that is not dependent on the speed of another drive enables demand-based cooling. This reduces the power requirements whilst also cutting down on frictional loss, fuel consumption and pollutant emissions.
Electrical CWA coolant pumps offer top performance. They can be used for the main cooling of the combustion engine, as well as for cooling the fuel cell stacks of fuel cell drives.
Pierburg has made the electrical water pump ready for series production and was the world’s first series-production supplier for a leading premium vehicle manufacturer.
Compact radial auxiliary coolant pump.
Speed control and extended diagnostics information via PWM or LIN bus.
Efficiency close to 40% at the nominal operating point.
High flow rate at a low pressure.
Homogeneous heat dissipation.
Optimised for high-temperature applications and more demanding service life requirements.
Improved resistance to influences that impair EMC.
Imperial & Other
Liquid Temp Range
-40 to 128 °C
-40 to 262 °F
Ambient Temp Range
-40 to 140 °C
-40 to 284 °F
Ø 40 mm
Nominal Diff. Pressure
Maximum Current Draw
Maximum Electrical Consumption
Manufacturer Part Number
Pierburg: 7.03665.66.0 or BMW: 11517604027 / 11518625097 / 11518635089
The pump can be installed in either a horizontal or vertical position. To avoid air-locks when mounted horizontally, the outlet should be turned in such a way that it is directed upwards or is placed on the upper side of the pump body.