All I know is that I bought two of these:
I way over purchased. The pumps are used in a Ebb and Flow system with about a 5 foot rise and 1/2" vinyl tubing. I don't run it 24/7 but it is way more pressure then I need. I have a splitter where the second line out is just feeding back into the res so I can lower the water pressure going into my trays. The noise from the pump is much less than the water overflow going back into the res but that's using it as a submersible pump.