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Thanks for the info guys. If I drain a rad and remove it then use the rad valve as a drain point, is there an adapter (i.e. hose barb) I can use to attach a hose to the drain valve?

I'm not sure of the exact model at the moment because I'm not at home, but I know it's a Potterton. What's the best option for draining down without a draining point? I'll check out the "H" tonight when I get home. Thanks

Yeah, the downstairs radiators do have cold spots at the bottom (in the middle) so I though there might be some muck in there. If this is causing the overpumping is it imperative to get it sorted soon? I was going to leave that until the spring. Is powerflushing the only option, or is there...

Hello I'm new to this forum and to central heating systems! I have just moved into a 1930s house with open vented central heating system A while ago I noticed that the central heating comes on when only hot water is selected on the control box and worked out that the fault must be with the...