HydroMist pumps are considered high pressure which is needed to properly atomize water into a fine mist that can evaporate quickly and drop temps up to 25 degrees. All pumps come with Standard hose hook-up to any water spigot. Each pump differs by features and Horsepower. HP determines the amount of nozzles it can run at high pressure. All HydroMist pumps are 850 PSI (Mist N Go) and up. ProMist Series all 1000 PSI