Thanks Steve - When I said that rad was on zero I meant frost setting. If I put rad on 2 or 3 it still belts out even in the summer when it is hot and just the water is on. Is this a problem with the thermostat on that rad 'cos then i can get a plummer in.
I did not realise you have to leave a rad on all the time to protect the pump - does the frost setting count as on?
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!