The BPP 4500/50 booster pump with pressure tank is designed to use free water sources. It provides service-water for the washing machine, WC or for watering the garden, fully automatically. The pump switches itself on and off according to demand. This compact unit operates with a mechanical pressure switch and an 18-litre water tank. In respect of this buffer, the pump does not have to be switched on and off every time water is required. A pressure gauge shows with which pressure level the pump distributes the water from the spring, cistern or rainwater tank.