2 speed matrix verses dynamo

linen · Jun 25, 2011

I have a 3/4 hp one speed now (service factor of 1.0) and I would like to replace it with a 2 speed. The hayward matrix 2 speed model lowest hp rating is 1 hp, where the pentair dynamo has a 3/4 hp 2 speed model. Somewhere I have seen the the Hayward hp is "max rated" so it might be closer to 3/4 hp?

Any thoughts on which might be best for me?

Bama Rambler · Jun 25, 2011

Either will probably be fine for you. To figure the real numbers you need to multiply the hp by the sf, also known as the SFHP. If they match closely then it's basically the same motor.

mas985 · Jun 25, 2011

Nearly all AG pumps are up rated so they should be similar in performance. The best thing to do is to compare the head curves.

linen · Jun 25, 2011

mas985 said:
Nearly all AG pumps are up rated so they should be similar in performance. The best thing to do is to compare the head curves.

I looked at the curves, looks like the 1hp version of the hayward matrix is slightly higher than the 1 hp pentair dynamo...but close. However, the 3/4 for the pentair is lower. I do not know what the head curve is on my current pump to compare to. I have ordered the Matrix 1 hp 2 speed, but am now second guessing myself, and am thinking of the Dynamo 0.75 hp 2 speed. Any thoughts?

JasonLion · Jun 25, 2011

You have a small pool, I would go with the smallest possible pump.

linen · Jun 25, 2011

I do have the 4 solar panels on the roof, but my 3/4 does pump fine now...

mas985 · Jun 26, 2011

Another option that is less expensive is to replace just the motor with a two speed motor.