When Your Water Heater Sounds Like a Foghorn Fix

by

Ever had that heart-stopping moment when your water heater starts making a noise eerily reminiscent of a foghorn? I have. The first time I encountered this, I thought my house was being haunted by a ship at sea. But, fear not! Here’s a step-by-step guide to diagnosing and fixing this problem, gleaned from my own hands-on experience.

Identifying the Foghorn Sound

Situation: You’re relaxing at home, and suddenly your water heater emits a loud, resonant sound, much like a foghorn.

Common Culprits:

  1. Sediment Build-Up
  2. Water Pressure Issues
  3. Valve Malfunctions

Step-by-Step Solutions

1. Sediment Build-Up

How It Happens: Over time, minerals from hard water accumulate at the bottom of the tank, causing blockages and strange noises.

Solution:

  • Turn Off the Heater: Ensure your water heater is turned off and give it time to cool down.
  • Drain the Tank:
    1. Attach a garden hose to the drain valve.
    2. Direct the hose to a safe drainage location.
    3. Open the valve and let the tank empty.
  • Flush Out Sediments: Once drained, turn on the cold water supply to flush out remaining sediments.

Pro Tip: Perform this maintenance task annually to prevent sediment build-up.

2. Water Pressure Issues

How It Happens: High water pressure can cause the heater to make a foghorn noise.

Solution:

  • Check Pressure Relief Valve: This valve releases excess pressure from the tank.
    • Locate the valve, usually on the side of the tank.
    • Lift the lever to let out some water and relieve pressure.
  • Install a Pressure Reducing Valve:
    • If your home’s water pressure is consistently high, installing a pressure reducing valve can help.
    • This should be placed where the main water line enters your home.

Pro Tip: Ideal home water pressure is between 40-60 psi. Use a water pressure gauge to check your levels.

3. Valve Malfunctions

How It Happens: Sometimes the internal valves within the water heater, especially the inlet valve, can wear out or malfunction, causing the foghorn noise.

Solution:

  • Inspect and Replace Faulty Valves:
    • Turn off the water supply to the heater.
    • Carefully inspect the inlet valve. If it’s worn or damaged, replace it.
    • Reassemble everything and turn the water supply back on.

Pro Tip: Regularly inspect the water heater valves to catch problems early.

Preventative Measures

  1. Regular Maintenance: Schedule routine checks and maintenance for your water heater.
  2. Water Softener: If you have hard water, consider installing a water softener to reduce sediment build-up.
  3. Pressure Monitoring: Regularly check your home’s water pressure to prevent excess stress on your water heater.

When to Call a Professional

If you’ve tried these solutions and your water heater still sounds like a foghorn, it might be time to call in a professional plumber. Persistent noises can indicate more serious issues that require expert attention.

Quick Recap

  • Sediment Build-Up: Drain and flush the tank annually.
  • Water Pressure: Ensure it’s between 40-60 psi.
  • Valve Issues: Regularly inspect and replace faulty valves.

Addressing these areas should silence that foghorn for good, ensuring your water heater runs smoothly and quietly. Happy plumbing!

Share the Fun!

Leave a Comment