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I own a condo and the heating is from a hot water radiator. We have a hot water radiator at the living room and there is quite a noise (some clanking but mostly like water running on a pipe) coming from it even though the main valve is all the way off. The one in the bath and bedroom make no noise on or off. Any tips appreciated.

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It depends partly on your location but many radiator systems have bypass pipes through which water passes to and from other radiators on the same circuit - even it that particular radiator has it's valve turned off.

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Air in the heating pipework can cause the sort of noises you describe and can be eliminated by bleeding the air from the system

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