The water circulation pump Yonos PICO-STG from Wilo features high quality, ease of use and functionality as well as ecology. The high-efficiency pump has been specifically designed for use in the primary circuits of solar and geothermal systems. The control (control mode or fixed speed) is done simply with one button; in addition, the pump’s speed can be externally controlled by two integrated PWM interfaces, fitting it to the respective system. The ring LED is colour-controlled and allows the quick overview over the operation status or possible faults. The KTL coating of the pump’s casing increases the product lifetime and protects the pump against corrosion.