Decision Paralysis - Single speed pump to variable speed pump

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  • Last Post 21 September 2017
Javier posted this 20 September 2017

Hi Guys,

Well, I've read so much information that I can't make a decision and I'm hoping you can help.  I have two basic questions:  should I switch to variable and, if so, which one?  Using the label on the side of my current single speed motor and the info on your website I've determined that I have a B661, 1.25 HP total (.75 hp x 1.67 SF), 230V, 11.2/6.0 - 5.6 amp.  After calculations I'm showing that my current pump uses 1.38 kw at 3450 rpm.  Since the kw will vary on the variable pumps, I'm not sure how to compare to see if it makes sense to switch to variable.  Any guidance?

variable-speed-pump-motor b661 ecm16squ
InyoRob posted this 21 September 2017

Hello Javier - We have a detailed article titled "Variable Speed Pool Pump or Dual Speed..Which is Best for Me?". It covers the differences and benefits of single speed, dual speed and variable speed motors.

I would recommend the variable speed motor for your application. Something like the ECM16SQU would mate up with your pump. The ECM16SQU is a 1.65THP variable speed motor. The B661 motor will be pulling 1,288 watts while running. You can see from the chart below that a variable speed will run at dramatically lower watts if running below 3450 RPM.

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