This Grundfos recirculation pump for hot water features a brass housing, 15mm inlet/outlet diameter with nuts and olives, and operates on 220-240 V supply voltage. Made in Germany, this pump is ideal for secondary hot water return systems. It has had light use, removed shortly after initial installation. It has since been stored. Built in pin selected 24hr timer makes it easy to have the pump in operation when you require it and off at other times; maintaining the hot water storage in the cylinder. Pre-wired 0.75mm flex for ease of installation via fused spur or plug top. Internal push connectors should the cable have to be replaced. Manual over-ride for switching unit permanently ON, OFF or TIMER.