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Hi, I've had an ongoing problem with 4 upstairs radiators not getting as hot as they should. They do get warm along the top but the bottom is always cold, the return pipe tends to be hot but the flow pipe is cold so I assume it is heating via convection rather than flow? I've tried isolating...

Hi I have an open vented system with 18 radiators + 20sqm or so of underfloor heating (never used). It has 10mm plastic pipe upstairs and 10mm copper downstairs feeding the radiators (powered by a grundfos 15/60). I've had a problems which has been getting progessively worse where the...