Reply To: banging steam radiator

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    The banging is miniature explosions that occur when steam, (which has a lot of extra potential energy), meets a pool of water and condenses instantly releasing that energy. You could have a bad trap that is retaining the water in the radiator, or one that is letting the steam leak through and contact the water in the return system. In either case, the building maintenance should be able to fix it by repairing/replacing the return trap.

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