New VFD booster pump to replace old booster pump to save energy

Saving Energy with a New VFD Booster Pump System

Saving Energy with a New VFD Booster Pump System

Original Booster Pump System

Key Characteristics:

  • VFD booster pump;
  • Saving Energy;
  • Saving Money


A local building owner had a 25 year old booster pump system.  It ran all the time causing high energy costs.  Lead time to get parts to repair the pump was three to four weeks long and the cost was quite high.


Not only to combat the cost of repairs now and in the future, but also to combat the high energy bills that resulted from the old booster pump, W. L. Gary Company suggested the installation of a new booster pump system.  We selected a Variable Frequency Drive (VFD) booster pump system.

New VFD Booster Pump System

A VFD, which electronically varies the speed of the motor, allows the pump to run at different speeds depending on the demand for the pump.  In the old system, like most traditional booster pumps, when the pump was needed it had to start up and run at full capacity to help level out any drop in pressure.  And like most machines, starting a motor and ramping it up quickly uses a lot of energy.  With the new VFD system, the motor can run at a lower speed to correct minimal drops in pressure and only ramp up to full capacity when absolutely needed.

With the ability to vary the speed of the motor, a smaller pump, one with a lower horsepower, could be used to handle the job that traditionally needed to be higher horsepower to complete. The old system used two 20 horsepower pumps, while the new system uses two 7 ½ horsepower pumps.

This new smaller VFD booster pump system uses much less energy than the old system. The customer expects to save between $7,000 and $9,000 a year in energy costs from this one system.

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