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Water Heater Making Noise? What It Means and When to Worry

A water heater that's suddenly noisy is trying to tell you something. The type of sound is a good clue to what's going on.

Popping or rumbling

The most common cause is sediment that's settled at the bottom of the tank. As the burner heats water trapped under that layer, it creates steam bubbles that pop, causing the rumbling sound. A tank flush usually clears it up.

Ticking or clicking

Often just pipes expanding and contracting as they heat up — usually harmless, though a plumber can add cushioning if it bothers you.

Screeching or whistling

Can point to a partially closed valve or mineral buildup restricting water flow, causing pressure to whistle through a narrow gap.

When to call it in

Loud banging, hissing near the pressure relief valve, or any noise paired with a leak at the base of the tank should be checked out promptly — it can be an early sign the tank is failing.