If that 600 watts is correct that is a HUGE electric water pump. The CVR pumps I use pull about 7 amps, making them a little less than 100 watts. Keeps the engine plenty cool, too.
I wonder if they have gone to a higher voltage electrical system? There was talk in the industry a while back about moving to a 48V system. That would make a 600 watt pump a little more believable at 12.5 amps.
By the way, both watts and horsepower are measures of power, and can be compared. 1HP is the same as 750 watts. So that 600 watt pump they are talking about is equivalent to less than 1 HP. Even considering the inefficiency of the alternator, that is a big power savings compared to a mechanical water pump, which can consume well over 10 HP at high engine speeds.