How does this pump save me money? Why does it reduce the energy cost by up to 80%? Does it change speeds based on flow feedback?

The pump has a variety of speeds. It is programmable. When mine turns on, it is programmed at high speed for 30 minutes to clear the surface and get the water moving. My pool man programmed it for me to drop to 30% for the next 5 hours. That saves me $$. Now if I'm having people over to swim, i can hit a quick clean button to clear the surface again. The longer i can keep the pump running at less than full power the more money I save.

My 1hp pump went out and heard a variable speed pump is the way to go when replacing it. is it ok to go up to a 1.5 hp

Variable speed pumps can be set to handle different flows to accommodate pipe size, I use this pump to replace a 1.5 HP pool filter pump (2" pipe)and a 1 HP spa jets pump (1-1/2" pipe). Just program the speed (RPM) to accommodate the use and the flow of the pipe sizes. By only running the pump at the design capacity of the plumbing, noise is reduces to a wiper and it actually uses about half the energy that the original pump uses (in my case 400 watts vs 800 for the spa, yours may be different). All the speed in both pumps are set lower than 3000 RPM. No issues vacuuming (cleaning) and the Jets are quite strong in the spa). If you can effort the extra cost variable speed pumps are more versatile and they don't destroy their self by running full speed.

Is this a self priming pump?

yes after your first operation annually each morning it runs for 5 minutes at high speed and primes itself. I have never started spring without pouring water in the pot as I always did with my previous pump. Never after that even after cleaning the debris bucket do I prime again.

Will this pump be sufficient for a 11,000 gallon pool which has a pv3 in-floor pool cleaning system? i currently have hayward sp3215ee tristar 1.5hp

I don't have the PV3 cleaning system. In my opinion this pump outperforms all single speed 1.5 HP pumps if programmed right (60 to 100 GPM depending on TDH). I reprogrammed the "Quick Clean" function for swiping the pool clean, I imaging that in your case after the nozzles lift, then you can set the speed of the pump for optimal flow, energy savings and noise comfort. Because the regular programming uses a lower RPM in the second stage to save energy, that flow may not have enough to allow your system to work properly, unless you also reprogram that cycle phase and time. During the setup of my pump, I needed to lower the recommended RPM of the pump to get the right flow for my 1-1/2" piping, that saves even more energy and make the pump almost silent. My settings for filtering the water 2400, 1400, 2400 RPM (2, 4, 2 hours) For sweeping the pool the pool 3000 RPM 1 hour (Quick Clean) This is the best pump I ever owned (single speed vs variable speed comparison) and a more powerful pump in my and case, only my case, is not needed or wanted.

Product Dimensions	71.12 x 39.37 x 31.75 cm; 11.7 kg
Part number	342001
Item display height	12.8 inches
Item display length	28 inches
Item display width	16 inches
Item display weight	11.7 kg
Material type	Plastic
Power source type	Corded Electric
Manufacturer	Pentair - Distribution
Item model number	342001
ASIN	B00PKHX2BM

Pentair 342001 SuperFlo VS Variable Speed Pool Pump, 1 1/2 Horsepower, 115/208-230 Volt, 1 Phase - Energy Star Certified

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