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ok, so I bought a 1920s large 4 bed semi about a year ago, it has a condensing boiler which replaced an old oil fire unit about 2008, it feeds a hot water cylinder and rads as an open vented system. I replaced the pump with a new Grundfos Alpha2 as it was very noisy and the system worked well...

hi, my Wilo gold RS50 started to get really noisy, ran ok and all 14 radiators heated without a problem but could be heard all round the house. I ran it on setting 2 without any boiler or flow problems. So I replaced it with a Grundfos alpha 2l and immediately had flow errors f25 on my glow worm...