All downstairs rads are fine except the front room, which is some 6m from the manifold on 10mmm microbore. The manifold feeding this rad is a JG Speedfit Inline Manifold 4 Port unit.
My Q is, would a 12 m loop, 6m there and back feeding a 1kw rad be OK on 10-mm microbore or shoudl I consider upgrading this pipe to 15mm to help get increased flow to this rad? The issue of getting heat to the rad has never been there - always high 60-s at inlet, just no flow through the rad so huge temp drop and little heat.
Before anyone says it, I know I could have got a GS engineer to look at this weeks ago, but this is now a point ot principal for me that I, with your help, will fix this!
Thanks as always for the feedback.