high head and medium head pool pump

Which is Best: High Head or Medium Head Pumps?

0 thoughts on “Which is Best: High Head or Medium Head Pumps?

  1. Hi sir, got a pool under construction with volume capacity of approx 26,124 gallons (US) which should be filtered every 8 hrs. Average flow head of skimmers and drains is 40 feet. Before I purchase, please advise me on the appropriate size of the most energy efficient pump and filter suitable to this size of pool. Thank you.

  2. I have a WhisperFlo WF-28 on my pool right now, but it’s getting ready to die. I’m figuring out what to replace it with and was going to just get a motor for now as the pool is ~15 years old so the heater, filter, booster pump, etc are all going to need replacing in the next couple years anyway.

    My problem is that I think the WF-28 might be undersized. I calculated my TDH using your charts and I arrived at 165 feet (there’s a spa, two drains 6.5 feet deep, and 5 returns so all those joints really added up, I think). From the WF-28 charts it looks like it’s not rated for this many feet.

    So my question is, can I get a high pressure motor to replace the motor on the WF-28 or should I replace the whole pump? I assume the whole pump because I’m guessing the whole unit is built to either handle the high pressure or medium pressure.

    Am I correct in my logic? Does 165 feet of head sound crazy? Since I’m looking at an overhaul in the next year or so can I get by with a WF-28 replacement motor and just run it longer?

    1. I’m going to be honest, I am a little skeptical of the feet of head measurement. read through this other guide to get a clarification on feet of head: How Do I Calculate Feet of Head for My Pool?

      Also, if the WF28 was working fine for however many years, I would keep the setup as is, unless there is a sudden needs to turn over your water more. If the feet of head was 165 that pump probably wouldn’t be able to prime itself let alone pump enough water to keep the pool clean. A replacement 2 HP motor (B855) for the WF28 is available or you can go up a horsepower, but if you upgrade the motor you will also need to change the impeller.

  3. I’ve swapped out and replaced part # for part # on my 2 HP Challenger:
    Shaft Seal
    Mounting plate
    Impeller
    Diffuser
    Volute
    Band Clamp
    O-rings

    Getting a small continuous drip at seal plate and housing….don’t understand why. Pool guy comes in and changes out the diffuser and impeller to a 1HP version. no leak now, but pop ups are barely popping out water. Also paramount water valve is reading 30 PSI, never been that high.

    is the 2HP impeller/diffuser high pressure parts too much? should it be 2HP impeller/diffuser high flow instead? like i said, i swapped out part # for part #….

    1. So I am a little confused. Did you switch to a 2 hp from a 1 HP, vice versa, or is there a mistype in there somewhere? Because in your comment it sounds like you have switched HP or something but also go on to say you have switched like for like by using the same part number.

      1. Challenger pump with 2 HP motor. I personally replaced mounting plate/impeller/diffuser/seal plate(355317/355604/355545/355303)…these are the exact part numbers I removed from what was in place when in working order.

        Upon replacing the above said parts, I got a leak at the bottom of volute/seal plate which was not the original issue.

        Given that I replaced everything new, and I got a leak, I decided at this point to call in a professional. Their diagnosis was it was leaking because 2HP was too much force. Their solution was to keep the 2HP motor and replace diffuser/impeller to the 1HP version(355074/355077).

        1. Their diagnosis doesn’t make much sense if the pump was fine until a set of like for like parts were installed. The two horsepower would also put out more flow, so there shouldn’t be a pressure issue unless your filter is dirty.

          My first instinct when I see a leak like that is to break down the pump and redo the steps of installation to ensure everything was done correctly.

          1. The 6 port water valve was also diagnosed as “bad” and encouraged to be replaced, so I did that. All 2 HP parts were put back on and and pump replumbed… leak at seal plate.

            By process of elimination, removed the water valve and voila…no leak. put the old water valve in that was suspected as bad…also no leak.

            Why would a new water valve cause leakage at the seal plate? definitely a strange one…

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