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Thanks for your help with this. This is just a quick note to let you know that last weekend I did the work and, barring fun and games with valve/pipe seals failing as the result of disconnecting the valves from the radiators (the reason I wanted to drain the system in the first place)...

Yep, got one of those. I guess my question really is, how do I refill the system. I know where the filling loop is and I've used it to repressurise the system from time-to-time. Is that also used to refill the system? If so, is there any magic, or do I just start filling, wait for the...

Greetings All I have a combi boiling central heating system. I want to drain and refill the system so that I can work on the pipes. What's the basic procedure? Elsewhere on the web I've seen pages that describe how to drain and refill a central heating system, but they cover vented...