What The Noises Coming From Your Water Heater Mean

Posted on: 9 June 2023

Do you hear noises coming from your water heater? Here's what to do about it and when to bring in an HVAC contractor.

Hissing Noise

A hissing noise coming from your water heater often indicates sediment buildup inside the tank. Over time, minerals and debris can settle at the bottom, causing the water to boil and produce a hissing sound.

To fix this issue, you'll need to flush the water heater. Start by turning off the power supply or gas to the heater, connecting a hose to the drain valve, and draining the tank completely. This process will help remove the sediment and restore the heater's efficiency. If flushing doesn't resolve the hissing noise or if you think it's too much for you to handle, call an HVAC contractor to inspect and flush your water heater.

Popping or Crackling Noise

If your water heater makes popping or crackling noises, the cause is likely mineral deposits that have formed on the heating elements. Over time, these deposits can cause uneven heating and result in a popping sound.

To fix this issue, you'll need to clean or replace the heating elements. This process is usually too complicated to do on your own, so you'll want to call an HVAC contractor.

Rumbling or Banging Noise

A rumbling or banging noise from your water heater is often a sign of excessive sediment buildup or overheating. This occurs when the sediment layer becomes too thick, causing the water to boil and produce noise. 

The first thing to check is the temperature setting. If the temperature is right and you don't have an overheating issue, a flush could remove any sediment causing the noises. If the rumbling noise continues or if you notice leaks or a reduced hot water supply, it's best to seek the help of a professional HVAC contractor.

Whistling or Screeching Noise

A whistling or screeching noise coming from your water heater could be due to a malfunctioning pressure relief valve or excessive pressure in the system. Check to see if your home has a water pressure regulator that allows you to reduce the water pressure in your home.

If lowering the pressure solves the noise but reduces your water pressure too much in your sinks and showers, you'll need to have an HVAC contractor make adjustments to your system. If you can't lower the water pressure or it doesn't work, you'll need to have an HVAC contractor come out to do an inspection.

For more information, contact a water heater repair company near you.


Summer is Upon Us – Is Your AC Working?

Hi. My name is Laurie Waters. The HVAC contractor was just out at our house last week and did I ever get a lesson from him. You see, we had a warm spell hit and I went to turn our air conditioning on for the first time since last summer. Much to my dismay, it wasn’t working. All I got was a blast of warm air. The fan was bringing the outdoor heat inside. Thank goodness it wasn’t anything major. My unit needed Freon. While he was here, the contractor taught me how to do some routine maintenance around my unit, vents, and filters. I’m going to share this information with you. I hope you find it to be useful.

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