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Dave - Thanks for the help. NTC = (????? Temperature?? Controller??) - I have tested the resistance and this is varying with temperature change in the Kohm area. Do you know the resistance/ temperature range correlation? (Not a PT100 type device!) I will check the pot later. As for...

Hi Dave, Sorry to sound a bit thick but what is the ntc? Mark

Right, Everything was OK and then I noticed that when the Rads are up to tempertaure etc.... the boiler runs for 2 mins and then stops on supposedly reaching temperature! This cycle goes on forever or until you let all the rads cool right down. I have proved out all the obvious stuff...

Thanks guys, Really appreciate the feedback - guess I am off the on wrong track but it still intrigues me how a BBOE works given the explanation of hot water rising by by JohnD The inverse must be true - cold water falls - hence the circulation action. Many thanks once again - time to...

Come on Bacho - Don't leave me hanging!! What is the gem of information behind your comment. I am ready to be officially labelled a numpty!

Hi to all, Newbie on this forum and need some help on this ..... trawled the web for hours trying to find an answer!!!! Anyway, Mrs wants these fancy vertical rads and I can save myself a bundle of work if I mount the flow and return connections at the top for the downstairs radiators...