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I have a central heating and hot water system that was installed a couple of years ago, and works, providing heating and hot water as it should . That should be the end of the story, but the loft space ( 10 cubic metres) that the Worcester boiler and the pressurised hot water cylinder are...

I have tried everything to fix a single cold radiator which has never worked since I moved in Changed the rad, the TRVs, removed some isolating valves I found on the spur. There is flow to the rad ( the flow pipe gets hot), there is flow on the return ( the system drains successfully...

Newb - please bear with me - I use this a lot for reference and advice, but first question. I have one radiator that refuses to get anything more than luke warm. I just spent most of my Sunday replacing it with a new one and new TRV and lockshield - with only marginal difference. Let me...