I'm contemplating replacing the pump on a waterfall in an effort to save money on electricity. The current pump dedicated to the waterfall is a Hayward SP4015NS attached to a 1.5 HP Northstar motor. The pump I'm contemplating replacing it with is a Hayward TriStar waterfall pump. Hayward makes two models of this pump, one which typically generates ~75GPM and a second which generates 120GPM. I am trying to decide which pump would be most appropriate. Can someone with experience help?
Here is a brief video of my current waterfall in action. The waterfall is perhaps 6 feet high and 9 feet wide. Ignore the hose at the top of the waterfall: that was a neighborhood kid screwing around. The waterfall pump is at my equipment pad, which is located perhaps 10 or 15 feet behind the waterfall: http://youtu.be/KGNnsHbd3P0
I don't mind a more impressive waterfall if the water flow doesn't destroy it.
Here is the brochure with curves for the Hayward TriStar pumps. I believe these pumps can be plumbed to fit my current setup: http://www.ezpoolz.com/content/tristarwaterfall.pdf
Despite a lot of searching, it isn't clear to me what the HP of these TriStar pumps are, and how much energy savings I might realize from installing one.
Based on the video, can anyone suggest an appropriate GPM/rate of flow for my waterfall? Any thoughts on what energy savings I might (or might not) realize? Thanks.