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I suppose it could be worse. I could get a Jack-of-all-trades, master of none to do it, that doesn’t know the difference between a combi boiler and a system boiler. As you highlighted it "SYSTEM BOILER". Then you know what i'm installing. Since when has there been a mains cold water feed...

I was wondering how long it would be before id receive a sarcastic remark. All I need now is someone to mention the competent word. Why can no one answer a simple question? Kevplumb, answer me this. Are you a plumber?

Where is the correct postion to fit the DCV/Valves for the filling loop? I'm getting materials sorted out to upgrade my heating system. I will be fitting a vaillant 615 system boiler and vaillant unistor 155 unvented cylinder. I know that one side has to connect to the return pipe of the...