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sorry i meant to say that the radiators are constantly hot even though the thermostat is on water only not heating only...

can someone help. I have an hercal coil indirect cylinder that is approx 9 years old. There are two pipes on the side, from what i have read the top pipe is meant to be hot and the bottom one cold. They are both hot is this meant to be? There is also a problem with the radiators they are...