My Hayward 3/4 hp pump just died and I was gifted a 1hp Hayward. Can/should I do it or will it wreak havoc with my system? I have a 28,000 gallon pool. I don’t have the money to upgrade to a vs pump at this point btw.
Replacing a 3/4 hp with a 1hp pump?
- Thread starter shamagical
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Welcome to TFP!
That’s kind of a can of worms. Because of the way manufacturers market their motors, the motors could actually be the same size.
A 28,000 gallon pool would likely need a 1HP pump, but it’s going to depend completely on what filter you have.
If you could post pictures of the motor data plates (Where Amps, voltage etc are listed) and the model of your filter, we can help you out.
That’s kind of a can of worms. Because of the way manufacturers market their motors, the motors could actually be the same size.
A 28,000 gallon pool would likely need a 1HP pump, but it’s going to depend completely on what filter you have.
If you could post pictures of the motor data plates (Where Amps, voltage etc are listed) and the model of your filter, we can help you out.
Which Hayward pump quit working? Why did it stop?
Which Hayward pump was a gift? If it is an above-ground pool pump it will not work.
Correction it’s a 25000 gal inground pool. The pumped that died was a Hayward super pump 3/4hp. It looks to be electrical issue (burnt connections) most likely due to me installing it myself about six years ago. The new pump is a single speed Hayward 1hp super pump 700. I will have an electrician wire this one if/when it goes in. My filter is a Hayward 19” sand filter. Likely undersized technically but it has worked great (clean pool) for years and I’d rather not replace.
The pump should work fine.
You can replace the impeller with a smaller impeller if you feel like the new pump is too strong.
You can replace the impeller with a smaller impeller if you feel like the new pump is too strong.
It comes with impeller SPX2607C, which is curve A.
Impeller SPX2605C will give you curve B.
Impeller SPX2600C will give you curve C.
If we estimate your system curve, you can see that the flow is not really that much different with the different impellers.
Impeller SPX2607C will give you about 50 gpm at about 15 to 19 psi on the filter.
Impeller SPX2605C will give you about 45 gpm at about 12 to 17 psi on the filter.
Impeller SPX2600C will give you about 42 gpm at about 10 to 14 psi on the filter.
I would replace the impeller with a SPX2600C, which should work well and it will use lower power.
IMPELLER 1 SPX2600C SPX2605C SPX2607C SPX2610C SPX2615C SPX1621C
SP2600C...1/2 total hp (0.5 to 0.6 H.P).
SP2605C...3/4 total hp (0.75 H.P).
SP2607C...1.0 total hp (1.0 to 1.1 H.P).
Impeller SPX2605C will give you curve B.
Impeller SPX2600C will give you curve C.
If we estimate your system curve, you can see that the flow is not really that much different with the different impellers.
Impeller SPX2607C will give you about 50 gpm at about 15 to 19 psi on the filter.
Impeller SPX2605C will give you about 45 gpm at about 12 to 17 psi on the filter.
Impeller SPX2600C will give you about 42 gpm at about 10 to 14 psi on the filter.
I would replace the impeller with a SPX2600C, which should work well and it will use lower power.
IMPELLER 1 SPX2600C SPX2605C SPX2607C SPX2610C SPX2615C SPX1621C
SP2600C...1/2 total hp (0.5 to 0.6 H.P).
SP2605C...3/4 total hp (0.75 H.P).
SP2607C...1.0 total hp (1.0 to 1.1 H.P).
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Those filters are prone to splitting if they get too much pressure.
I would downsize the impeller to the SPX2600C, which will create a lot less pressure and it will use a lot less power, but the flow difference is negligible.
What was the filter pressure for your old pump after backwash and when it needed to be backwashed?
If your old pump was a 3/4 hp then it probably had the SP2605C impeller. (3/4 total hp (0.75 H.P)).
You can remove the impeller from your old pump and use that if you liked the flow and don't want to buy a new impeller.
That's about 62 GPM.
The new pump will do about 69 GPM at about 14 psi unless you replace the impeller.
A SP2600C would do about 55 gpm at about 8 to 9 psi.
Hi James,I’m having trouble taking apart to access impeller on the Hayward superpump 700 - has the cooling fan and electric box on top. Haveyfound any Videos on YouTube. Any advice? Thanks!
Usually, just holding the fan tightly will allow the impeller to be removed. A strap wrench would be of good use here.
sktn77a
Gold Supporter
There was a bad batch(es) of Hayward sand filters but yours probably isn't one of them (statistically). A 28,000 gal pool should really have a larger filter but what you have is what you have. James is correct, in a perfect world, you would replace it with the same capacity pump. But if it were mine, I would just substitute the new pump for the old one.
In my opinion, it is a bad design and not just a bad batch.
It is a used pump.
The smallest impeller will use about 600 watts vs about 1100 watts, which is an extra 500 watts for about 14 GPM more flow that you don't even want or need.