Can somebody help, I have a combi boiler. Recently I installed a chrome towel rail in the bathroom, however within a year it had rusted quite badly. The manufacturers did change it although they recommended I use a central heating inhibitor. Looking up on the internet it recommends I put the inhibitor in the header tank, however because I have a combi boiler, I don't have a tank. Is the manufacturer talking rubbish, or do I need an inhibitor. If so how do I put it in the system.