Recent content by sergii

Thanks for the suggestions. One thing I am still not clear about: my existing Grundfos Selectric UPS 15-50 is a DN15 pump, and my heating system pipework is 15 mm. The Wilo Yonos Pico 25/1-5-130 appears to be DN25 (larger nominal bore), although it seems to have the same 130 mm length and the...

Thank you for the helpful replies. I would appreciate any further suggestions for suitable replacements, especially modern, efficient models. Has anyone had experience with the newer Grundfos pumps? For example, would a Grundfos Alpha2 15-60 130 be a suitable replacement for the old UPS 15-50 in...

Hi, I have an open-vented central heating system with a Grundfos Selectric UPS 15-50 circulation pump (photo attached). The electrical supply intermittently trips when the pump is connected and running. Sometimes it runs normally for a while, but then the MCB trips and occasionally the RCD also...