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...