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I'm testing the pump curve on a grundfos ups 50-80/4 hooked up to 2.5" copper monoflow tee primary loop and my inlet gauge reading was 14psi and 22 psi at outlet of pump with all the zones calling for heat and with one zone calling for heat it was at 14 psi at inlet and 23 psi at outlet. The boiler has 14 psi in boiler. To get the head of feet number do i use 22 psi or 22psi - 14psi= 8psi to use. 1 psi=.43 head feet.