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I didn't mean 'what f & e' like: 'what do you mean. its a combi!'...... When I said 'what f & e', I just meant that I didn't know what an f & e was! Thanks for your advice, it was certainly the best I have received so far. But I'm still confused as to how I flush the system...

Could anybody please tell me how to clean, flush and add inhibitor to my central heating system (without power flushing)? I have a combi-boiler. Also, I've noticed that whenever any plumbers do any work on our system, they generally replace the valves on the radiator they are working on. Is...

Did you read my original post? Obviously I know that I have to drain the system, my question is how do I do it correctly? But replies that say things like 'flush system with x300', 'use the filling loop', etc aren't much help. If I don't know how to drain the system, how am I going to know how...

I need to replace the piping though, so I will have to drain the system won't I? Can anybody reply to my original post in a slightly more coherent manner please? As I stated originally I am completely new to central heating, so I can't really understand abbreviated/ grammatically incorrect...

Sorry.... what is f and e tank? Which pipe do I put what down?

I would like to replace the piping to some radiators to improve its appearance. My system has a Worcester 24i combi boiler and uses 10mm piping. I have a wall-mounted thermostat. Most radiators have piping that comes down the wall to them. There is no draincock on my system. I would be grateful...