Both water sources are still below the thermostat just as in your setup are both below it. They are seeing the same pressure in both examples.
I was contacted originally to design and develop this housing with one primary objective and that was to provide additional clearance between it and the front of the valve cover. Secondly, add additional bosses or ports to allow plumbing of the intake if the user so desired to use this method to heat the intake without having to add tee's or other unsightly and unnecessary clutter to an otherwise clean and sleek engine. It is up to the user to determine what philosophy they subscribe to, as to the best routing of lines and plumbing to complete the installation to suit them.
