F&E header tank water level rises.

pcr

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This is a standard semi-gravity system, boiler and pump at ground level, pump in return, header tank height approx' 5.5 metres.
When the pump turns on the water level in the header tank immediately rises by nearly 1cm. When the pump turns off the level returns to original. There is no pump over. Pump speed is 1 (3.5m static head).
Can anyone please explain if this is normal ?
 

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