Why Heating Boilers Make Knocking Noises
Many of Avon homes have hot water boiler heat. They usually heat your home quietly all winter, so you hardly know the boiler is running, but with time hot-water boilers can start making a rumbling, pinging and knocking sound when the burner is running. When the boiler is making noises it is known as “kettling” . This noise may become loud while the boiler is heating but stops soon after the burner turns off.
Hard Water Deposits
Depending on the system, a hot-water heating boiler is supposed to operate around 180 degrees Fahrenheit. In areas with hard water, lime scale deposits can form on the heating surfaces of the boiler. This can be the cause of boiler making noises. As water is heated in the boiler, the calcium salts dissolved in the water form lime scale on the inside of the boiler’s heat exchanger. The mineral deposits increases the temperature needed for heat to transfer, and the surface of the lime scale causes hot spots higher than the water’s boiling point, which create air bubbles in the boiler water. As the bubbles rise into cooler water, they collapse noisily. The formation and collapse of the air bubbles can be a leading cause of the boiler making noises.
Improper differential setting at the thermostat can cause the burner to operate too much, leading to overheating and boiler making noises. Poor near boiler piping design can slow water flow, leading to excessive boiler temperature and boiling. Low temperature drop across the heat exchanger due small circulating pump can also play a role in the boiler making noises. Air trapped in the system is another contributing factor to boiler making noises.
Cleaning the System
If your boiler is making noises contact a licensed hydronics technician. Once the technician has removed any trapped air and eliminated burners, thermostat, pumps and other mechanical causes for the boiler making noises, they may try a descaling of the boiler. This involves shutting down the system and allowing it to cool. The next step is adding descaling chemical called Hydro-Solve 9100, restarting the boiler and allowing the chemical to work for several days. The last step is to flush the boiler to remove the dissolved scale, then refill the boiler with fresh water.
Is your Avon hot water heating boiler making noises ? Give Absolute Plumbing & Boiler a call!
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