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Thanks. And since this radiator is the highest one in the house, then if I drain this one, by loosening B, I should be able to unscrew B without disconnecting the body of the valve from the pipe or raditaor. Correct?

Thanks. I think it is a sticky valve because since the post I've managed to turn the inlet valve further a/cwise, from 12 to 9. To strip them down, once I have removed the valves, so I need to undo nuts A and B in my picture or just A?

Hi, I've got a cold towel rail. This what I've done so far: 1) Closed all over radiators except towel rail and run heating until boiler nearly knocks off - and then turn boiler stat dpwn, but leave room stat up and pump running. Hot water should be circulating and shouldn't have problems with...

Thanks for the reply. I'll try removing the residue and see how fast it re-appears. On fire up from cold, the boiler does run for 15-20 mins before deciding to have a rest. I thought the boiler had sensors on the input / output pipes and when a differential of around 10 deg C was reached...

Please take a look at the photo. the Grundfos 15-50 UPS is fitted in a 3 bed house with an Ideal Elan Minimiser SE60 condensing boiler. All rads are new (last 3yrs). I'd like to know a) is the crusty blue build-up normal - to me it looks like the isolation valves may be leaking. b) what...