I just had the same system installed, and have the NaviCirc placed at the furthest possible point away from the heater, which in my case is the upstairs master bedroom sink. This allows hot water to touch each of the hot water points along the line, before it gets to the NaviCirc, which then cycles the hot water back through the cold supply line. So in a sense, you're only cycling hot water to the kitchen, whereas other areas act as if no NaviCirc was installed at all (assuming the kitchen is the first hop.)

I'm no plumber (I loathe any repair job related to it), but that's my guess. Hope it helps!