Why Is My Water Heater Making Weird Noises?

Water heaters can make several types of noises from time to time. Some of these noises are normal, and you should not worry about them. However, some noises can give early warnings of components that need repair or replacement. Learning to differentiate these sounds, therefore, is key to the optimal performance of your water heater.

Types of Sounds You May Hear

Crackling, Popping, & Rumbling Sounds

These sounds are common with older units. Notably, sediments can collect around the elements of the heater and the tubes. You may notice rumbling sounds produced by these sediments being stirred by the water flow inside the tank.

Humming Sound

This sound may originate from parts of your electric water heater. Ideally, water flows around the elements and causes vibrations, which are characterized by a humming noise.

Knocking/Hammering Sounds

As the internal pipes heat, they vibrate and knock on the walls, producing a knocking or hammering sound. If you abruptly turn off the water leaving the tank, it can cause pipes to move and bang against interior walls and studs.

Singing/Screaming & Screeching Sounds

Screaming sounds are caused by water that is forced through a small opening. This is common with valves that are not opened fully at the water heater or at other outlets like the sink.

Ticking/Tapping Sounds

Most heaters feature a heat trap or check valve that prevents water from flowing in the wrong direction. These valves usually produce a ticking or light tapping sound.

4 Common Reasons Why Your Water Heater Makes Noises

The following are four things that can cause your water heater to make noises:

Sediment Buildup

The sediments lying at the bottom of your tank will move with rising temperatures, producing a humming noise resembling that of a coffee maker. The debris can cause your tank to overheat and leak or burst.

Accumulation of Mineral Deposits

If you reside in an area with hard water, your heater tank can accumulate mineral deposits over time. These minerals, such as magnesium and calcium carbonate, cause sounds when heated.

Poor Water Flow

A sizzling sound from your heater may signal that water is not flowing into the tank as intended. This problem typically originates from faulty valves in the unit.

The Pipes in Your Building

The pipes in your system can also produce annoying noises. As warm and cold water pass through the pipes, they cause the tubes to adjust in diameter, which results in a ticking sound.

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