If your water heater has started making strange noises, it’s not something to ignore. Sounds like banging, popping, rumbling or high-pitched whining often point to underlying issues. Some are minor and some are more serious. At Parts4WaterHeaters, we help homeowners and heating professionals by providing access to the precise replacement parts they need to get things working quietly again. Read on to learn more about what those noises might mean and which components could be failing.
Rumbling or Popping: Sediment Buildup
One of the most common causes of noise in a water heater is sediment buildup at the bottom of the tank. As the heating element warms up, trapped water under the sediment layer boils, creating rumbling or popping sounds. Over time, this can reduce efficiency and damage the heater.
What to check or replace:
- Flush the tank to remove sediment
- Inspect the heating element for buildup
- Replace the anode rod, which helps reduce mineral accumulation
Whining or Screeching: Valve Restrictions or Pressure Issues
A high-pitched screech or whine typically indicates that water is being forced through a restricted opening. This often happens when the inlet control valve isn’t fully open or when there's an issue with the temperature and pressure relief valve.
What to check or replace:
- Fully open the cold water inlet valve
- Test and, if necessary, replace the T&P relief valve
Banging or Knocking: Water Hammer
If you hear a loud bang when you turn off the water, you're probably dealing with a water hammer. This is a sudden pressure surge caused by fast-closing valves or abrupt changes in water direction. Left unaddressed, it can stress pipes and fittings.
What to check or replace:
- Inspect or replace the expansion tank
Crackling or Sizzling: Leaking or Condensation
For electric heaters, crackling or sizzling sounds often indicate moisture is reaching the heating elements. This could be due to a small leak or excessive condensation inside the unit.
What to check or replace:
- Turn off power and inspect for leaks
- Replace faulty heating elements or worn gaskets
- Check the drain valve if water is leaking from the bottom
Ticking or Tapping: Expanding Pipes
Ticking noises may simply be the sound of pipes expanding and contracting as they heat and cool. While not dangerous, it can be annoying.
What to check or replace:
- Use flexible connectors to allow for pipe movement
- Apply pipe insulation to reduce sound transmission
Find the Right Parts with Confidence
At Parts4WaterHeaters, we stock a full range of replacement parts – everything from heating elements and anode rods to valves, thermostats and more. Whether you’re performing routine maintenance or tackling a sudden repair, we’re here with the supplies you need to address the issue fast.
Browse our catalog or call 800-536-1582 to get started.
