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My radiators are knocking. What can I do?

Answered by Jeffrey Anderson ~ March 16, 2010 ~ No Comments » | Respond to this question

My radiators are knocking. They make a lot of noise. It is like water is rushing through the ceiling. What could be the problem?

Jeffrey Anderson

Hi, Knocking radiators bring back childhood memories for me. My grandmother's house, north of Pittsburgh had radiators, and I remember many a winter morning waking to the sound of the radiators. I imagine it's much the same in St. Paul, Minnesota, except twice as cold.

Knocking radiators can be caused by many issues. It can be a problem within the radiator itself, there can be a problem within the piping, or there could be an issue with the boiler. You don't mention if the home is new to you. In my experience all hot water radiators knock a little bit on occasion, and the rushing water could simply be valves opening up. However, whether you have lived in the house long enough to know what the radiators normally sound like, or are new to the home, you should have a plumbing contractor or a heating and air conditioning contractor come out and take a look at the system.

This is the type of issue where if there is a problem, and it is not attended to promptly, it could lead to more expensive repairs down the road. It's better to have someone look at it, and even if everything is fine, at least you will have peace of mind. When you call contractors, make sure you tell them what type of heating system you have, as many younger contractors may not have experience on your type of system, although there may be a lot of hot water radiator systems in St. Paul.

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