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Thread: Pumps and Valves - 2sp vs VS?

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    Pumps and Valves - 2sp vs VS?

    I'm debating between a 2sp and variable speed pump. I've read all the posts regarding cost per kWh, and from that I would say a 2spd is fine. However, I still keep thinking that I like the flexibility of a VS.

    Our pool will be:
    IGP, gunite, approx 14k gallons, raised spa, spillway to the pool, 2 bubblers on tanning ledge, raised bond beam w/ 2 sheers. My PB is strongly pushing a 2 speed over a VS. In fact, he personally prefers a single speed. He says that if I get a VS, I'll end up programming it for 2 speeds anyway! I asked about how I'd adjust the amount of water the water features are pushing and he said they are controlled via valves, not pump speed and in fact, if I kick the pump up I'll have water going crazy everywhere unless I re-adjust the valves.

    So - whats the opinion here? Will I use a VS's features or will a 2sp do everything I need?
    34x17 Freeform Gunite IGP and spa (approx 17k gal)
    Hayward 2HP/2SP TriStar Filter Pump & Tristar Booster
    ProLogic PS-8 and AquaPod
    400k Heater
    CLI Sunstone Quartz Plaster

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    jv92red's Avatar
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    Re: Pumps and Valves - 2sp vs VS?

    While this is a great question and you will get some opinions both ways (I would get a VSP if you able to financially for a new build but a 2 speed would be fine as well) but I see a bigger problem. So your pool builder would prefer a single speed pump controlled by valves over a 2 speed or VSP? That is an explanation I would love to hear...
    15'x35' IG 16,500 gallons w/attached raised 18" spa continuous coping w/underneath spill and ledger stone wrapped, NPT mini pebble aqua blue w/2x pigment & abalone shell finish, 2"x24" travertine coping, 3x Jandy Color LED lights (2 in pool), Jandy Flo Pro 2HP VS pump, Jandy LXI (low NOx) 400K BTU heater, Jandy CL460 cartridge filter, Jandy AquaPure Ei SWG, Jandy Z4 automation with iAqualink and remote poolside PDA, 1,300 sqft Belgard Catalina paver deck with drainage, fire pit that matches the spa with travertine coping and wrapped in ledger stone, Elitewood insulated patio cover, Vinyl gates, back vinyl fence coming soon...
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    Mod Squad zea3's Avatar
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    Re: Pumps and Valves - 2sp vs VS?

    Is your builder only recommending one pump to do all that? What size pump does he recommend?
    TFP Moderator
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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    Re: Pumps and Valves - 2sp vs VS?

    Quote Originally Posted by jv92red
    While this is a great question and you will get some opinions both ways (I would get a VSP if you able to financially for a new build but a 2 speed would be fine as well) but I see a bigger problem. So your pool builder would prefer a single speed pump controlled by valves over a 2 speed or VSP? That is an explanation I would love to hear...
    He basically says that on low speed, the water features dont run well, and as far as cost savings his theory is running for xTime on High Speed isn't much different that 2xTime on Low speed. I tend to think he's just a little bit old school in his approach, but he'll do whatever I ask in the end - I just want to make sure I ask for the right thing! LOL. He's also self admittedly very 'frugal' in his approach. He's tried to talk me out of spending money more often than not.
    34x17 Freeform Gunite IGP and spa (approx 17k gal)
    Hayward 2HP/2SP TriStar Filter Pump & Tristar Booster
    ProLogic PS-8 and AquaPod
    400k Heater
    CLI Sunstone Quartz Plaster

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    Re: Pumps and Valves - 2sp vs VS?

    Quote Originally Posted by zea3
    Is your builder only recommending one pump to do all that? What size pump does he recommend?
    No - I forgot to mention he is recommending a booster pump (for the sheers I believe). We just added sheers to the design, so originally it was just the spa spillover and bubblers and he was recommending the 2HP/2spd TriStar. I think he's still recommending the same main pump plus a booster.
    34x17 Freeform Gunite IGP and spa (approx 17k gal)
    Hayward 2HP/2SP TriStar Filter Pump & Tristar Booster
    ProLogic PS-8 and AquaPod
    400k Heater
    CLI Sunstone Quartz Plaster

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    Mod Squad Bama Rambler's Avatar
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    Re: Pumps and Valves - 2sp vs VS?

    A VS pump is a lot more versatile especially where multiple water features of different designs are involved. To take advantage of the capabilities of the pump you need an automation system so that you can program the speed to match the operating parameters. (i.e. if the bubblers are selected you can have the pump run at a certain speed, whereas if the spa is selected, it can run at a different speed, and if the cleaner is selected it can run at an even different speed. In this case I'd select a VS over any other pump.

    Depending on choking off valves to adjust the flow isn't a good control scheme for pools. Actuated pool valves aren't control valves, they only have two set positions on and off. Even though you can limit how far they open you can't readily adjust it. And it's going to be a pita to manually adjust the valves everytime you want a little dlfferent action form the feature.

    Which automation system are you going to have?
    Dave J. TFP Moderator
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    Re: Pumps and Valves - 2sp vs VS?

    Quote Originally Posted by Bama Rambler
    A VS pump is a lot more versatile especially where multiple water features of different designs are involved. To take advantage of the capabilities of the pump you need an automation system so that you can program the speed to match the operating parameters. (i.e. if the bubblers are selected you can have the pump run at a certain speed, whereas if the spa is selected, it can run at a different speed, and if the cleaner is selected it can run at an even different speed. In this case I'd select a VS over any other pump.

    Depending on choking off valves to adjust the flow isn't a good control scheme for pools. Actuated pool valves aren't control valves, they only have two set positions on and off. Even though you can limit how far they open you can't readily adjust it. And it's going to be a pita to manually adjust the valves everytime you want a little dlfferent action form the feature.

    Which automation system are you going to have?
    I think we are getting the Hayward Aqua Plus Panel.

    One other thing I thought of that might be related to all of this is that we are going w/ a robotic cleaner, so the pump isn't part of that system.
    34x17 Freeform Gunite IGP and spa (approx 17k gal)
    Hayward 2HP/2SP TriStar Filter Pump & Tristar Booster
    ProLogic PS-8 and AquaPod
    400k Heater
    CLI Sunstone Quartz Plaster

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