High efficiency domestic circulator pump with 6m max head, 180 mm port-to-port length and 2" threaded connections The Wilo Yonos PICO range are glandless domestic circulator pumps designed to minimise power consumption within a home heating system. As well as being highly energy efficient, they are designed with ease of installation in mind, with Wilo's unique Wilo-Connector to allow toolless electrical connection, and a special pump venting procedure. They feature Wilo's Red Button technology which makes set-up and commissioning very simple and straightforward.