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Thread: Using a single pump instead of two

  1. Back To Top    #1

    Join Date
    Oct 2013
    Location
    San Diego, CA
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    42

    Using a single pump instead of two

    I have a similar question, have been on the fence between 2 pump and 1 pump solution for spa jets and pool/spa heating/circulation.

    I initially had 1 pump, but wanted a few more jets, then went to 2 pumps, one being dedicated to the spa jets. Now I talked to a plumber who suggested the intellifloXF and using a diverter valve to put say 80% of the water to the spa jets and 20% through the filter/heater to maintain spa temp.

    The next plumber I talked to thought that idea was ridiculous and I would not be happy with it and should go back to a dedicated 2 pump solution.

    Is the single pump with diverter value going to annoy me if it's on a JVA? (automated) or will I regret not doing a 2 pump?
    O/B Pool: 11,000 gal, 32x15 with baja step, 7ft spa with Waterway jets, Jandy Aqualink RS6 with Pentair IntellifloXF pump. SWG, iAqualink, LED lights, cover-pools auto cover.

  2. Back To Top    #2
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,482

    Re: Replacing two pumps with one?

    It depends. What are the flow requirements for the jets and how many do you have? The downside of a single pump for spa is that you will be sending a very high volume of water through your filter and heater so they need to be able to handle that plus that will create extra head loss that a dual pump system doesn't experience so the single pump needs to be larger than a jet only pump.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  3. Back To Top    #3

    Join Date
    Oct 2013
    Location
    San Diego, CA
    Posts
    42

    Re: Replacing two pumps with one?

    I should clarify a bit.

    The GPM requirement for the jets might be around 110GPM. (based on 9-10 waterway jets)

    The single pump design was to NOT put all the water through the filter, but bypass the filter/heater altogether. Ordinarily this would be water going in to pump and straight back to jets. This doesn't heat the spa so I didn't like this design. That's when it was suggested to PARTIALLY bypass the filter so that 100GPM was going to spa jets and the remaining GPM was going through the filter/heater/spa return.

    The maximum flow rate for heater and filter is about 120GPM, so theoretically I can run my ~100GPM spa jets. But I think the total head loss of the equipment, valves, lines, returns, and jets will drag down my max GPM below 100 for a single VSP 3HP pentair intelliflo XP pump.

    That's the delima I'm stuck on.

    I'm thinking that if I have dedicated double spa loops (4 jets and 6 jets) that I can role the dice on a single pump, and if the GPM isn't cutting it, then upgrade to a booster pump on the 2nd loop of jets.
    O/B Pool: 11,000 gal, 32x15 with baja step, 7ft spa with Waterway jets, Jandy Aqualink RS6 with Pentair IntellifloXF pump. SWG, iAqualink, LED lights, cover-pools auto cover.

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