Why Is My Water Heater Making Noise?

Water heaters aren't silent, but a sudden pop, rumble, tick, or hiss, or any sound you've never heard from yours before, is worth a closer look.

Popping or rumbling

Tank-style heaters can collect sediment and mineral deposits over time, and heating water around that buildup can create popping or rumbling. Maintenance needs vary by equipment and local water conditions, so follow the manufacturer's instructions for your specific heater.

Ticking

Pipes and components expand and contract with temperature, which can produce occasional ticking or tapping. A new, persistent, or unusually loud sound is more worth investigating.

Hissing

Don't assume every hiss means the same thing. Look for visible moisture around the unit and its accessible connections, without removing covers or touching anything electrical.

Look at the whole picture

Noise matters more when it comes with:

• Water around the heater
• Rust or corrosion
• Discolored water
• Unreliable hot water
• Temperature swings
• Electrical problems
• Gas odors

When should I stop troubleshooting?

If you smell gas, leave the area and follow your gas utility or local emergency authority's instructions. Don't keep diagnosing the heater yourself. Water near electrical equipment also calls for caution. Leave that kind of problem to someone with the right training. Persistent or worsening water-heater problems? Find Local Plumbing Help