yes i can confirm categorically that it will not. I am sure i have posted elsewhere, but the fitting instructions give 3 options.

1) remove mech water pump and use ewp for all cooling.
2) do not remove water pump and use ewp for extra flow rate.
3) do not remove water pump and use ewp for "top up" cooling.

to be precise - this is what Craig Davies state....
Options for pump control:

1. With EWP ’smart’ Controller. Recommended method. Use the Davies, Craig EWP controller for optimum temperature control. The EWP Controller has a microprocessor, which will supply the pump with the voltage, that will run it at exactly the right flow rate to maintain the set engine temperature. You set the temperature you want on the ’smart’ Controller for maximum power and fuel efficiency!

With the ignition on, the EWP will run on after a hot engine shut down, eliminating heat soak.

This option requires the removal of the thermostat and either the mechanical pump impeller from the pump shaft, or the bypass of the water pump pulley from the belt set-up, using a shorter belt.

2. With Davies, Craig Thermal Switch (Part No. 0401), or Electronic Switch (Part No. 0402)
Combine the EWP with an adjustable on/off thermal switch to add a cooling boost to an overheating cooling system when required. With the Thermal Switch connected to the battery, the EWP will run-on after a hot engine shut-down, eliminating heat soak.

3. Continuous Running.
Wire the pump direct to the ignition for maximum cooling - suitable for race vehicles, very hot climates and chronically over-heating engines. This option requires the removal of the engine thermostat and either the mechanical pump impeller from the pump shaft, or the bypass of the water pump pulley from the belt set-up, using a shorter belt.

I Know of several peeps that use the ewp in option 1 with existing water pump with no problems, providing the ewp is switched at a higher temp than the thermostat opens, ensuring that the system is fully operational before the ewp cuts in. After switch off cooling is not a problem, because the thermostat is wide open - if not you dont need the ewp!
 
ozzy manuf of Electric water pumps - bit like askin "who is mr Royce" - they are the main manuf of ewp in the world.

morning slob - i am surprised you didny know? - shall i post a q in "ask slob"?
 
so we have to rely on the thermostat then. does it help prevent heat soak if the thermal switch set to 100 degrees?
 
the thermostat determines at wot the minimum temp the engine should run at - it is designed to allow the engine to get to a nominal operating temp quickly - ir with the thermostat closed - the coolant is restricted to (more or less) the negine - when the thermostat open, the coolant is allowed to flow to the radiator and thereby keep the coolant to within certain design limits. The water pump will be running all the time the engine is running - even with the constriction placed on it of the thermostat. there is no point it starting the ewp before the thermostat opens - it wud just delay the engine getting to operating temp - well below critical. The ewp is there to assist cooling at the top end of the temp band and to stop hotspots developing in the engine on power off.
 

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