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moltenmetal (Chemical) 27 Sep 12 10:44 You are quite correct that the dielectric joints do little good if there is an alternative, low impedance connection between the two electrodes. But they will do no harm either- unless they fail due to improper installation. Many thanks for confirming...

Thank you. The tank is bonded to the copper pipes by around 60cm of 2.5mm sq copper wire. This will give a resistance between the tank and the copper pipes less than 0.01 ohm. Even a galvanic current as big as 10A would only result in 0.1V or less voltage difference. I'm still puzzled...

I have a question that I imagine corrosion engineering experts will find trivial - but it's puzzling me. I'm living in France and have just replaced my "chauffe eau" - a 200 litre hot water tank with built in 2.4kW electrical heater and thermostat. The instructions say that the tank should be...