Water Heater Making Noise? Fix These 7 Common Sounds

If your water heater is making noise, it may indicate sediment buildup, a failing heating element, or a pressure issue that requires inspection or maintenance.

Is your water heater suddenly sounding like a haunted house? Strange noises from your water heater often signal maintenance needs or potential failures. Learn what each sound means and how to fix it before small issues become expensive repairs.

Water heater making noise and causing concern

Why Water Heaters Make Noise

All water heaters make some operational sounds, but sudden or loud noises typically indicate problems. The most common causes include:

  • Sediment buildup in tank (especially with hard water)
  • Failing heating elements or anode rods
  • Water pressure issues
  • Condensation problems
  • Loose components or pipe fittings
Water heater noise and solutions guide

7 Common Water Heater Noises and Solutions

1. Popping or Rumbling Sounds

This is the #1 complaint – loud pops or deep rumbles coming from the tank. It happens when:

  • Sediment accumulates at the tank bottom
  • Steam bubbles form under sediment layers
  • Bubbles burst through sediment when water heats

Fix: Flush your water heater annually. For severe cases, use a descaling solution or replace the anode rod.

2. Hissing or Sizzling Noises

Electric heaters often make these sounds when:

  • Lower heating element is buried in sediment
  • Condensation drips onto gas burners
  • Small leaks develop in pipes or valves

Fix: Check for visible leaks first. If none found, flush the tank and inspect heating elements.

3. Hammering or Banging

Sudden loud bangs occur when:

  • Water flow stops abruptly (water hammer)
  • Pressure surges through pipes
  • Loose pipes bang against walls

Fix: Install water hammer arrestors or adjust water pressure. Tighten loose pipe straps.

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4. Ticking or Clicking

Frequent ticking usually comes from:

  • Heat trap nipples (normal operation)
  • Pipes expanding/contracting with temperature changes
  • Loose pipe straps or brackets

Fix: Most ticking is harmless. For bothersome sounds, replace heat trap nipples or secure loose components.

5. High-Pitched Whistling

Screeching or whistling means:

  • Severe water flow restriction
  • Failing pressure relief valve
  • Kinked water lines

Fix: Immediately check valves and water lines. This often requires professional repair.

6. Humming or Vibrating

Electric heaters may hum when:

  • Heating elements vibrate at certain frequencies
  • Loose electrical components arc
  • Water flow causes pipe vibrations

Fix: Tighten electrical connections. Install vibration dampeners on pipes if needed.

7. Running Water Sounds

If you hear water flowing when the heater should be idle:

  • Leaking temperature/pressure relief valve
  • Internal tank leak
  • Broken pipes or fittings

Fix: Immediately inspect for leaks. Shut off power and water if leaks are found.

When to Call a Professional

While some noises have simple fixes, these situations require a plumber:

  • Any gas water heater issues (risk of carbon monoxide)
  • Water leaks you can’t locate or stop
  • Persistent noises after basic troubleshooting
  • Relief valve discharging water

For complex repairs, consider professional-grade tools that technicians use for water heater service.

Preventing Water Heater Noises

Regular maintenance prevents most noise problems:

Maintenance Task Frequency Benefit
Tank flushing Annually Removes sediment buildup
Anode rod inspection Every 3 years Prevents corrosion
Pressure valve test Every 6 months Ensures safety
Pipe inspection Monthly Catches leaks early

According to The Spruce, sediment buildup causes 80% of water heater noise complaints. Regular flushing can double your heater’s lifespan.

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Special Considerations

Tankless Water Heaters

While less prone to sediment issues, tankless models can still make noises from:

  • Mineral buildup in heat exchanger
  • Water flow restrictions
  • Combustion fan issues (gas models)

Hard Water Areas

Homes with hard water should:

  • Flush heaters every 6 months
  • Consider water softeners
  • Use powered anode rods

For whole-home solutions, explore water treatment systems that reduce mineral content.


Joye
Joye

I am a mechanical engineer and love doing research on different home and outdoor heating options. When I am not working, I love spending time with my family and friends. I also enjoy blogging about my findings and helping others to find the best heating options for their needs.