it isn’t pumped. It circulates on on its own. I didn’t understand it either. Convection??
But I tell you it works. If I place my ungloved hand on any hose or exterior of the engine block or heads, its “warm” to the touch. The reservoir is “hot” to the touch. At -20, its immediately noticeable.

Once running, Less than 100 yards from the house, the cabin is warm. I’ve learned to turm the temperature settings in the cabin to the highest setting in the winter, prior to shutdown.
And I only plug it in for an hour or 2, prior to needing her.

 

Turns out there is an auxiliary cooling pump, and it looks like it's integrated into the FFBH.

"On cold climate market vehicles, the cooling system is modified to incorporate a FFBH and auxiliary cooling pump."

 

Apologies, I wasn’t paying attention. “ecotec” is GM. “ecoboost” is Ford.
I wanted to amend the title for us but can’t seem to find a way to do that.

 

Into editorial purgatory you go...