Here is my pipe sizing. questions-on-pipe-sizes-and-booster-pump-t71211.html
Note: My equipment is about 10 feet below the water level.
I am going to change a new pump when the existing pump gives up its soul (very soon). My electric rate is about 12 cents /kWH. I think I need a 2 HP pump because my spa has 6 jets. Please correct me on the pump size if I am wrong. Here are my choices Pentair VS ($866), Pentair WhisperFlo 2 speed ($642), and Pentair SuperFlo 2 speed ($488).
From these pricing, it seems to make sense that I should choose either a VS or a SuperFlo because WhisperFlo's price is somewhere in between. Pool use will be 95% while SPA use is 5%.
1. In terms of total ownership cost over service life of the pump, what one is more favorable?
2. Another option is that I can re-plumb the pipes so that I can put a dedicated SPA pump and new 2.5" pipes to intersect the existing SPA's suction and return with a 3-way value respectively. Then I can replace the existing pump with a 1/2 or 3/4 HP pump. Two single speed pumps cost about the same as a VS pump. But this setup requires 2 new jandy 3-way values and new pipes. The SPA pump does not get used very much, though. What do you think about this idea?
3. Can low speed in 2 speed pump generate enough head to circulate the water? It only uses 1/4 HP at low speed, I think.
4. By the way, Leslie pool supply wants me to pay them for a technician onsite inspection before selling my the VS pump. Can my existing plumbing handle it? I don't know what they need to inspect. They also said that I won't get factory warranty if I install it myself. Is it true?
5. When people say they have 1.5" plumbing, do they mean 1.5" pipes between the equipment or throughout the pool? I have 2" pipes between the equipment and throughout the SPA but 1.5" for pool return and suction. What size of plumbing do I have then?