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I had some Quinn Slieve radiators fitted about 18 months ago 5 horizontal and 1 vertical and noticed just recently that all the horizontal ones are relatively cold at the bottom compared to the top, the vertical one is fine, got my plumber back to balance the system which he did to some degree...

Have a Vaillant ecoTEC plus 618 boiler, wired as S plan, 2 x Honeywell motorised valves, Honeywell ST6400 programmer, Honeywell wiring centre and Salus RT500RF. After the summer found had no CH which I traced to valve head which I changed, worked ok for a few hours and then packed up again, did...