Grundfos. SB Booster 3-45 AW + PM1. This is a submersible pump designed for pumping clean water for domestic and rainwater applications. It is quiet when submerged and therefore a noiseless alternative to surface pumps. The pump is made of high-quality composite and stainless steel materials that are resistant to corrosion. It is equipped with a 15 m supply cable and the maximum installation depth is 10 m below the water level, with a liquid temperature ranging from 0 °C to 40 °C. The pump has built-in thermal protection, which stops the pump immediately if it overheats. The PM 1 pressure manager is intended for automatic start/stop control of this pump. With this control solution, switch-on at 2,2 bar is possible. The PM 1 switches the pump on when the switch-on pressure is reached, and the pump runs as long as there is flow. The PM 1 provides dry-run protection and cycling alarm for improved safety.