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I have added 2 new radiators to my CH system and they are both lukewarm at best. One is downstairs (using 15mm plastic pipe), the other upstairs (on 10mm copper) Both have new valves, are free of air, and run clear when you drain them so I don't think there is any sediment in them. The...

I've just bought a Drayton RT212 10mm Angled Radiator valve with the intention of fitting it to a 10mm pipe into my radiator. The valve has arrived with a 15mm connection together with a "10mm adaptor" which I can't for the life of me figure out how to fit onto the pipe. Do I need to solder...