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Had this on another post too and someone told me to check on the water cylinder for a label. So had a look on the cylinder and there was a label at the back, and it says (Indirect Cylinder). :lol: Will make a start on it later then! Thanks for your assistance.

Does that mean then when I drain the system this smaller tank should also empty? And then I put the inhibitor in into the small tank and the inhibitor will go into the system when I turn the water back on to for it to circulate and fill up the system. As you say then you think mine is an...

I plan to add a extra radiator to my heating system, I have bought the radiator however it states it cannot be used for a "direct central heating system" because you cannot put a corrosion inhibitor in it. Can you tell me what a direct central heating system is? My system is quite an old...