1) electric motors are either all on, or all off, in everyday driving you'll get into situations where the coolant will be flowing too quickly to lose the heat that's built up, or the motor will be off and it won't be flowing anything
2) electric motors fail much much sooner than a typical waterpump, and when they fail once again it's a matter of all on, or all off, a belt driven waterpump will still move the coolant somewhat as it dies, once the electric dies, it's dead
1: like i did told , its with a rpm and temp sensor , spinning faster when is hotter , and slower when cold .
2: my 40 year old electric heater blower is stil in the car , stil working after 40 years . i think the motors they make now these days are much better then 40 years back.
my design is 1 compact alu part with intregated electric motor , not a stand alone electric motor with a belt to the pully , there is no pully ore belt in my design , verry smooth apperance en polisht alu , with some cooling ribs onto the outside for the better look and some realy cooling.
btw:
got the strutsetup already into the car ? ore the new design motormounths ?