I need help in deciding on a replacement for our 1.25 SFHP Whisperflo WF-24, which has succumbed to salt-air corrosion deterioration. According to the charts, the WF-24 (installed by previous owner, and run 24x7) flows 88 GPM, at the 30' head I estimate for our installation. That pump seems way oversize. I'm considering the following options:
- WFE-2 energy efficient single speed, 0.95 SHP : Rated 77 GPM at 30' head. Drop-in replacement. Comparing minimum amperage's (4.5 vs 7.1 for WF-24 ) this would yield $40/mo. power savings. But will it really save? I'm not sure if the WFE-2 has a smaller pump, or just a smaller motor spinning the same pump, and if there is enough reserve power to vacuum the pool.
- Superflo VS: This seems like it would be a good choice except it has 1.5" fittings, which doesn't match my 2" plumbing. Interpolating the charts, it looks like I would need to set it up for around 2400 RPM to get the 30 GPM needed for the saltwater chlorinator to function properly. Am I right on that GPM figure for the chlorinator? What happens if the flow is less than that. Does it damage the chlorinator? I'm confused about use of the lower RPM settings. For instance, 1400 RPM line on the chart intersects 0 GPM at just 14' head; does that mean I would not be able to use that setting at all?
- Intelliflo VS: Appears like it would barely be breathing hard to run my application. Flows 90 GPM at 2350 RPM setting. Pentair quoted me 33-50 GPM at 1750 RPM on 250 watts, which seems like a good fit. Would I run it like that 24x 7? That's $100/mo power savings. And at 1150 RPM, they quote 22-30 GPM at just 74 watts. Wow! Could I use that setting part of the day or will low flow harm the chlorinator ? Pentair says no worries about the intelliflo electronics holding up in our salt environment. Should I believe them? I'm a little nervous about that because corrosion is a problem around here; people tend to put in basic stuff and then toss it out after it corrodes away.