Why your steam radiator is banging (and how to silence it)
In short: A noisy, banging radiator is often a sign of a physical imbalance. This guide explains how to identify and fix the mechanical issues causing the noise using basic tools.
The primary cause of a banging steam radiator is often that it is not level. When a radiator tilts, steam can gather in one area, creating pressure that leads to loud knocking. To fix this, homeowners can use furniture pads as shims to level the unit.
The process involves turning down the thermostat to stop the system, using a 48-inch level to check the tilt, and then lifting the radiator to insert pads under the feet. Additionally, replacing an old air vent with a new one—sealed with Teflon tape—is a key step in ensuring the system functions quietly and correctly.
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Sources
- Summary by Intellect · source: How to Quiet a Banging Steam Radiator | This Old House
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