Grundfos 30 BMQE 05B-90 Ez Boost Pump 1/2 hp (230V) - 91128531. Grundfos 30 BMQE 05B-90 1/2 HP (230V) Pressure Boost Pump: BMQE Booster Pump for EZ Boost System 1/2 HP 230 VoltThe Grundfos BMQE Booster Pump is the heart of the EZ Boost System. A complete system requires a pressure relief tank pressure sensor and controller. The BMQE pumps state-of-the-art motor provides high efficiency variable speed quiet operation and soft starting. The EZ Boost has built-in safeties and the small footprint allows for either horizontal or vertical installations. The EZ Boost Controller governs the BMQE pumps variable speed. Consequently the pump can be set to any duty point from minimum to maximum. NOTE: Pump must be placed in area that will not freeze as this will cause damage to the pump. Placing a pump in an area that is susceptible to freezing WILL void the Grundfos warranty. Grundfos BMQE Series Features: Maintenance-free operation Quiet operation Variable speed Electronic control and communication Parallel connection capability Dry-running protection High efficiency of pump and motor Soft starter Over voltage and under voltage protection Overload protection Over temperature protection Grundfos BMQE System Diagram 1. EZ Boost BMQE Pump 4. Pressure Sensor 2. EZ Boost Controller 5. Mounting Bracket 3. Diaphragm Tank 6. Flex Connector (recommended size 2 U.S. gallons (8 liter)/130 psi Grundfos EZ Boost Controller and Expansion Tank are sold separately. Grundfos BMQE Sizing Quick Guide The BMQE pump can be selected by following 3 easy steps: 1. Determine the pressure needed at your maximum flow 2. Determine your current available pressure (inlet pressure) 3. Select a pump from the chart that gives you the difference (desired pressure - available pressure = difference) Example: I need maximum 15 gpm with a total pressure of 60 psi. My current pressure available is 20 psi therefore I need a boost of 40 psi. The correct selection would be a Model 15 BMQE 05A - 110. (See highlighted