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I've attached the curves. 1 and 2 represent normal peak demand and fire suppression demand, respectively. The blue line represents the 120 ft TDH we normally pump at peak demand with a 40-60 cut off. (35 ft to water + 40 psi). The 27gpm figure was just a drawdown test we did a couple years ago...

I'm replacing a 35 yr old 3/4hp Franklin/Aermotor Pump and considering upgrading to a 1hp. The 3/4 pump worked fine (I don't know what the performance curve was) to supply two residences and some irrigation. But we live in a wildfire area and may want a fire protection ("Halo") system that would...