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.
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
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.
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.
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.
