How to Silence Water Baseboard Heaters

Inspect the heating system for leaks. When water escapes the heating system, air also gets into it, and the presence of air bubbles sometimes results in banging or gurgling noises within the system. Repair any leaks then refill the system as needed.

Open the bleeder valve with a hex key and then close it as soon as water starts to come out of it. Many systems have valves located near the high points of the heaters designed to remove excess air. Wear work gloves and turn the heat off, before doing this, to prevent burns.

Replace the expansion tank near the boiler if the heating system starts to sound like a river flowing through the house. This noise indicates a faulty diaphragm in the expansion tank that is letting excess water through it and is not forming a proper seal. Refill the system after replacing the tank and bleed out the air. This should stop the noise.

Listen to the pump. When the pump starts to fail, it often makes a lot of noise, and leaky seals within the pump contribute to this problem. Shut off the isolation valves on either side of the pump to prevent water loss then detach the pump from the system per the instructions for your specific heater system. Attach a new pump then reopen the isolation valves to restore function to the system.