Advice on Variable Speed Pumps for Spa

[JohnASmith]

I have a 2HP single speed motor/pump now and plan on replacing it with a 3HP variable speed. I like the Pentair IntelliFlo VS. Input would be appreciated. Thanks.

[Watermom]

I'll let someone else help you with this but one thing they will probably need to know is the volume of your pool.

[JohnASmith]

It is only 2,500 gallons but it has 16 jets. It is a large in ground spa. The main reason I want the variable speed is so I can run it longer during times of non use.

[mas985]

The main reason I want the variable speed is so I can run it longer during times of non use.

A cheaper option would be to replace your current pump motor with a two speed motor. A two speed pump would allow to run on low speed at off times and it would save quite a bit in energy costs. A VS is really overkill for your situation but if that is the way you want to go, an Intelliflo is a good choice, albeit an expensive choice.

[JohnASmith]

I thought of a 2 speed but it would really need to be 2HP high and 1/2HP low to do what I want and I don't think they make them that way. I also thought of paralleling a second pump with back check valves running only the one needed. Space is a bit tight for that but maybe possible.

[mas985]

HP motor ratings don't tell you much about the performance of a pump. I can show you a 1/2 HP pump that produces more flow rate than a 2 HP pump on the same plumbing. So why do you think a 1/2 HP is the right "size"?

FYI, with a two speed pump, low speed will have about 1/2 the flow rate of high speed but only at 1/4th the wattage.