I'm interested in the most efficient AC pumps available. Problem is I've gotta go by maufacturer's specs both for max GPH and watts.
Of course, nobody on this forum is running pumps with zero lift so I don't know how useful the manufacturer's data is even if it's accurate. It's pretty easy to figure out a theoretical gallons per watt - max GPH divided by the wattage rating.
Here are a few examples to get people going...
ECOPLUS 396
17 watt rating, 396 max gph, that means gallons per watt (GPW) is 23.3
ECOPLUS 633
35 watts, 633 max GPH, 18.1 GPW
LAGUNA MAX-FLO 600
32W, 600 GPH, 18.75 GPW
So the little ECOPLUS 396 is the most efficient of this small sampling.
What I'd really like to know is how efficient the pump is at 3 or 4 feet, which I'm guessing might be a ballpark real-world figure. In other words, how much lift to get the water into your DIY bio-filter...
Does wattage stay the same, regardless of lift? I would think not. Anybody know the answer??