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Thanks JPC, you may be right regarding the manifold. The pipe that feeds the annexe is in 15mm plastic. I am thinking that they may have pinched this when installing. Problem is I do not know if annexe rads ever worked. Was told when I bought house that they only needed bleeding. All the...

Have a flow problem with my heating system. I have had this problem since I moved into the house. The original part of the installation is gravity fed and the drops to the rads is in 8mm microbore. The pump is on the upstairs landing, and there are 2 manifolds feeding 5 rads each close by. My...