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I'll give that a try. Seeing as I've got a possible dispute looming, would a Bosch pump head fit on to a Grundfos base? Would there be any cross compatibility issue? Thanks.

Thanks, I've tried running the system in position 1, 2 and 3 and the issue still exists. The current pump is very hot, i.e. too hot to touch. System is also very noisy due to large quantities of air being circulated with no obvious leaks anywhere, plus multiple rads being cold or luke warm...

Hi, Over the summer we had a new pump fitted to our open vented system by a *reputable local heating company as the old Grundfos 15/50 had completely died. However since its replacement, with a Bosch 15/60 pump head, we've had trouble with circulation and a huge amount of air in the system...