Question: How accurate is the GPM readout on the Magna display?

Answer: For most applications, it is accurate to the actual flow. However, if the duty point is far to the left or right of the pump curve, it will diminish. In this case, there can be a 5%-10% differential between actual flow. In a dual head Magna 3, the right side can be up to 12%. Below is a chart supplied by Grundfos that illustrates the different models.

For additional questions, please contact your local Grundfos wholesaler or rep agency.