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This system uses a Partlow controlled variable frequency drive to run a centrifugal pump proportionally.  It recovers heat from water being discharged from a USFW fish research station: the water removed from the holding tank is pumped through a massive heat exchanger which recovers energy from the waste water, reducing the BTUs required to heat the fresh incoming water.  It uses an ultrasonic level sensor to determine how much water is in the initial holding tank.  As the water level increases and decreases with usage and the natural fluctuations of the stream which feeds the facility, the controller alters the pump speed to maintain the even level.

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