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Hi thanks for all the replies. P I will take all your advice and drain the system. The house wasnt built in the 1980s (built in 1910) but i just guessed the system must be old due to the age of the boiler. Dave

Thanks for your reply. Think I will go down the drain and refill method. Have you got any special tips for doing this on a primatic system? I don't want to cause any large air locks in the system. Dave

Hello All I'm a competent DIYer, fitted bathroom/kitchen but never really dealt with the central heating system. I want to replace a old single cast iron radiator for a new double convector radiator to increase the warmth in the room. So i started to do a little research on my setup. I have...