Quote:
Originally Posted by Slick Fork
Still at work so no pics yet but I had a thought and did some investigating. With all the concern about the energy draw, I did some "comparative shopping" to find out what other pumps with similar flow rates are pulling.
Hydor Seltz l40 @740gph is drawing 55 watts
Sedra KSP 9000 @900gph is drawing 90 watts
Eheim 1262 @900gph is drawing 80 watts
Quiet one 4000 @1017gph is drawing 50 watts
So if we pop the Resun in there at 70 watts/1000gph it's smack in the middle for power consumption beating out the eheim and the sedra.
That puts it a little better into perspective as far as power consumption goes anyways
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Those figures are misleading with respect to skimmer performance. The wattage you quote is the rated power for pumping 100% water. You won't be pumping 100% water while using it on a needlewheel skimmer since air is being mixed in. This will necessarily reduce the power consumption since air is a lot easier to move than water. Further, the GPH quoted is also for pumping 100% water and not an air water mixture. As a result, the proper analysis to do for a pump's skimmer performance is Litres per Hour of AIR (LPH) versus wattage draw. The only way to do this is with a Dwyer air meter and a Kill-a-Watt device since different pumps respond differently to being converted into air/water mixing devices. You must remember we are essentially using these pumps for a purpose they were not originally designed to do.
For example, the Sedra 9000 on my WM RX200 pulls about 1,000 to 1,100 lph at 47 watts (not 90W) - these are actual observed measurements by myself and consistent with the manufacturer's ratings.
I expect the Resun pumps to pull less power than their "water" rating, but the question is how much and at what amount of air flow? What I am surprised about is that the distributor/marketer (Proline, I believe) didn't provide these numbers in their marketing materials as with most skimmers. Other than construction quality and low noise, BK marketing is all about very low wattage draw to very high air draw. It's not that hard to determine the numbers. This is why I am somewhat concerned about the actual performance of the Resun pumps if no one has bothered to publish them. So my offer to test a vertex skimmer (or any skimmer) in the Lower Mainland stands.