Just for reference, I've got a Quiet One 4000 (NON-HH) that's feeding water from my sump, 8 feet horizontally and 2 feet vertically to the 20 gallon anemone tank, where it Ts off and continues 2 further feet horizontally, 1.5 feet or so vertically to my chiller, then another 2 feet or so vertically to feed the 55 gallon display refuguim, and it handles all that without a problem...