Water Heater Noises and What They Mean

More than 90% of U.S. homes have tank-type water heaters. The average life span of these water heaters is 10-12 years. While they sometimes quit unexpectedly, often there are warning signs or sounds to let you know that your water heater is struggling or needs to be replaced. Simons Heating & Cooling would like to share with you five common noises water heaters make and what they mean.

Water heater is making a knocking noise

The most common cause of a knocking noise in water heater tanks is sediment buildup and corrosion. If sediment has built up inside the water heater, it can cause the metal to rub against each other, creating a knocking sound. Debris and corrosion can also cause the metal to expand and contract, resulting in a knocking noise.

In some cases, the noise may be coming from the pipes. If the pipes are not properly insulated, they can contract and expand, resulting in a knocking noise. If this is the case, you will need to contact a licensed plumber to inspect the pipes and make the necessary repairs.

Water heater is making a popping noise

If your water heater is making a popping noise, it could indicate an issue with its pressure relief valve. This valve releases pressure and heat that builds up inside the tank. If the valve is faulty, it can cause a loud popping sound. If this is the case, it’s important to contact Simons Heating & Cooling as soon as possible to prevent further damage to the heater and ensure the safety of your family and your home.

The pressure relief valve can become faulty due to sediment buildup or corrosion. If the valve is clogged with debris, it can become stuck in the open position rather than releasing excess pressure. If sediment has built up inside the tank, it can create a buildup of heat and pressure, eventually forcing the valve to pop open.

In some cases, the valve may not be sealing properly. This can cause it to leak water, which can create a popping sound. You may also notice wet spots on the floor around the water heater, indicating a leak.

Water heater is making a humming noise

A humming noise from a water heater is typically caused by a buildup of sediment or corrosion on the heating elements, which can prevent them from heating the water correctly and cause a humming noise as they try to maintain the desired temperature. If the sediment is not removed, it can cause the heating elements to overheat and eventually burn out.

In some cases, the humming noise may be coming from the pipes. If the pipes are not properly insulated, they can contract and expand, resulting in a humming noise. This can be a sign that the pipes need to be inspected and repaired.

Water heater is making a hissing noise

When your water heater is making a hissing noise, it could mean there’s an issue with the pressure relief valve. The valve is designed to release pressure and heat that builds up inside the tank, and when it malfunctions, it can cause a loud hissing sound.

The pressure relief valve can become faulty due to sediment buildup or corrosion. If the valve is clogged with debris, it can become stuck in the open position rather than releasing excess pressure. If sediment has built up inside the tank, it can create a buildup of heat and pressure, eventually forcing the valve to hiss. You should not try to fix this issue on your own; call Simons Heating & Cooling instead.

Water heater is making a bubbling or gurgling noise

When your water heater is making a bubbling noise, it could indicate an issue with the anode rod. The anode rod is designed to protect the tank from corrosion and rust, and when it fails, it can cause a bubbling or gurgling noise.

The anode rod is typically made from an aluminum-zinc alloy and is suspended inside the tank. It is designed to attract corrosive elements and prevent them from damaging the tank. When the rod becomes corroded or depleted, it can cause the tank to bubble or gurgle.

In some cases, the bubbling noise could be caused by air bubbles in the tank. If the tank is not properly vented, air can become trapped in the tank, resulting in a bubbling noise. It is important to inspect the vent and ensure it is clear of any debris.

Whenever you need an inspection, repair or replacement of your water heater—including tankless systems—call Simons Heating & Cooling. We have years of experience with all sorts of sounds, and we’ll take care of whatever’s causing trouble.

Schedule your repair today by calling Simons Heating & Cooling at (518) 839-2602.

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