That strange noise coming from your water heater could be harmless. Or, it could be that your system crying out for help. Paying attention to the type of sound can help you figure out what’s going on.
In some cases, it’s a minor maintenance issue. In others, you might need a replacement for a failing system. Let’s walk through the seven most common water heater noises, what causes them, and what to do about them.
1. Popping or Rumbling Sounds
Over time, minerals can settle at the bottom of your tank. This is especially common in areas with hard water (and there are plenty of those in California). This mineral building or sediment traps water and creates steam bubbles that “pop” as they rise.
What to do:
- Flush the tank to remove sediment.
- Install a water softener if hard water is an issue.
- If popping persists, you may need to replace the anode rod.
2. Banging or Clanging Noises
When you hear a banging or clanging noise, it’s caused by something called water hammer. That’s when water stops suddenly and creates a pressure surge that rattles your pipes. Sometimes, it makes a really loud thud, which can rattle you. It can happen even if the hot water isn’t being used, which might explain why your water heater is making noise when the water is off.
Solutions include the following:
- Install a water hammer arrestor.
- Secure any loose pipe.
- Adjust your water pressure.
It’s a good idea in this case to call a plumber to evaluate your plumbing system.
3. Hissing or Sizzling Sounds
If your hot water heater is making a hissing sound, this might come from water leaking onto the heating element or burner. It’s a more common issue in gas water heaters, especially if there’s condensation or an unnoticed leak.
If you hear regular or consistent sizzling, it’s not a good thing and likely causing corrosion inside your unit.
You should:
- Inspect your water heater to look for any signs of leaks or water pooling near the base.
- Tighten any loose fittings that might cause leaks.
- Call a pro if the tank is leaking.
4. Whistling or Screeching Sounds
A high-pitched sound like whistling or screeching generally means water is being forced through a restricted or partially open valve. You might hear this more commonly when you first turn on hot water or even when there’s no water flowing out of the tap.
Typically, these noises can come from the inlet/outlet valves, the temperature and pressure relief valve, or from clogged lines.
Check to make sure that:
- All valves are fully open.
- There is no blockage or mineral buildup.
- Your water pressure isn’t set too high.
If the problem doesn’t go away, call a plumbing expert to do a thorough inspection.
5. Crackling Noises
Condensation dripping onto a hot burner, especially in gas water heaters, is typically the cause of a crackling noise. You’re more likely to hear the crackling when your unit starts up. It’s usually a minor issue, but you need to keep an eye on it.
Solutions:
- Improve the ventilation around the unit.
- Check the flue pipe for any blockage that can cause corrosion.
- Replace the burner plate if corroded.
6. Humming Sounds
You may hear humming sounds like a low hum or like a jet engine getting ready to take off. It might be a loose heating element that vibrates as it heats water. It can be annoying, but often it’s a quick fix.
Solutions:
- Tighten the heating element if accessible. (If it is old or warped, it might hum even when tightened.)
- Sometimes, lowering the thermostat slightly can reduce vibrations.
Humming can also indicate or failing thermostat or electrical connection. Have a professional inspect if the sound continues.
7. Ticking or Clicking Sounds
Ticking or clicking can come from sudden changes in water pressure or thermal expansion in the pipes. As metal parts expand or contract due to temperature changes, they can cause this sound. For example, you might hear your water heater making noise after a shower or when the heater cycles on and off.
Solutions include the following:
- Install straps or insulation around your pipes and heater.
- Put in a pressure-reducing valve if your home’s water pressure is too high.
- Add an expansion tank to absorb pressure fluctuations.
Avoiding Costly Hot Water Heater Repairs or Replacements
Understanding these noises can help you answer common questions like “Is a noisy water heater dangerous?” or “How do you know if your water heater is about to burst?”
While not all sounds signal danger, unusual or persistent noise, especially if your hot water tank is making noise consistently, deserves attention. Regular maintenance and a professional inspection can prevent small issues from turning into costly repairs or replacements.
Is your water heater making these noises? Contact the experts at Payless Water Heaters for your maintenance needs.
