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Can I ask if and how you resolved this problem MrBob, as I am having exactly the same problem. 6 rads up 5 down.

Using laymens terms so apologies if anything is described wrong. I have an 2 year old Ideal Icos HE18 condensing boiler and 11 radiators without any TRV's. The pump is a grundfos Alpha+ 15/60. The central heating works fine until the HW is turned on at which point the radiators downstairs...