Lancaster Pump’s VARIOspeed® Simplex Constant Pressure Booster Systems are simple to install and simple to maintain for larger residential and commercial applications where elevation is a concern or sufficient main pressure is not available. Their space sensitive design includes a wide capacity range from 10 to 150 GPM. The VARIOspeed® Controller regulates the speed of the pump to precisely match system demand, decreasing energy usage and allowing for reduced tank size.