I'm currently using a pump with a rated shut-off pressure of 69 PSI to supply a house with water. It is sucking through a 1.25" PVC pipe that extends 1100' into a lake. The lift from the water surface to the pump is about 15' and we are 1000' above sea level. Likely due to the lift and friction, the max discharge pressure I am able to get from the pump is 35 PSI.
If I change the pump to a larger jet pump with a rated shut-off pressure of 95 PSI, will I see a higher pressure at the discharge? Or will it simply flow more and the pressure will still be limited to ~35 PSI?
My goal is to supply the house with 40-60 PSI rather than the current 25-35 PSI. I prefer to do this with a single pump, but a booster pump in series is also an option.
Edit: We have a 26 gallon diaphragm pressure tank after the pump. I'm seeing the peak pressure of 35 PSI once the tank is full. The pressure switch on the pump seems to be working but the pressure never builds higher (and the pump runs continuously unless the pressure switch is set lower).
It is possible our current pump has some worn components which is preventing the higher pressure being reached, even when the tank fills up and the flow is reduced.