Water Heater Making Noise – Find Out Why Here (2023)

Do you hear a strange noise coming from your water heater? It can be quite unnerving and worrying. But don’t worry. It’s probably a common issue that can easily be fixed!

This article will provide helpful information on why your water heater is making noises and how to fix the problem. Read on to find out more!

Water Heater Making Noise

A water heater making noise is usually caused by sediment built up in the tank over time. To fix this issue, you should flush out your water heater every 1-2 years to remove any accumulated sediment. Doing so can help ensure the proper functioning and reduce the risk of noise or other issues related to a build-up of debris in your system.

Causes of Water Heater Noises

Water heaters can make various noises when they’re not functioning properly. While some of these noises may be normal, others can indicate an issue that needs to be addressed. Here are some potential causes for water heater noise:

Sediment build-up:

Hard minerals in the water settle at the bottom of the tank and form sediment, which can lead to loud rumbling or banging sounds during operation.

Loose components

If parts inside your unit become loose due to movement, vibration, or age, this could cause creaking, popping, and other noises as it operates.


As metal components corrode over time, they expand and contract causing squeaks and groaning while the unit runs. Normally, any sound emanating from your system should only last a few minutes after startup before fading away completely; however, if you hear persistent unusual sounds, it’s important to have it inspected by a professional plumber right away as it could indicate an issue with your system requiring repair or replacement.

Diagnosing the Source of the Noise

Diagnosing the source of a noise coming from a water heater can be difficult, but it is important to determine the best course of action. The type of sound and where it originates are two key indicators when diagnosing this issue.

A loud popping or banging noise often means there is hard water mineral buildup within the tank, causing sediment and limescale to hit the inner walls of your tank. This can happen more frequently after periods without use (such as during vacation).

To diagnose this problem properly, open the access panel and look for any signs of sediment build-up near the heating element or burner assembly. If that’s not present, you likely have an issue with pressurized hot water pipes expanding and contracting due to temperature changes like overheating or excessively cold outside temperatures.

For a hissing or whistling sound, check if it’s coming from a relief valve located on top or side of your tank – if so, then most likely you need to replace this valve because its pressure rating does not match your current setup; however if no relief valve has been installed yet then consider installing one for safety reasons.

Alternatively, air can escape through small cracks in piping joints, which could cause similar noises – inspect these areas thoroughly before attempting any repairs; otherwise, you might end up doing more harm than good!

How to Fix a Noisy Water Heater

Water heaters are an important part of a functioning home, and a noisy water heater can be an annoyance. Luckily, there are some simple solutions to help fix the issue. Here is a list of things you can do to address your noisy water heater:

Check the temperature setting

Sometimes simply lowering or raising the temperature setting on your water heater will reduce noise levels if it’s too high or too low.

Ensure that the thermostat is set between 120-140 degrees Fahrenheit or lower to lessen thermal expansion and contraction, which can result in popping and banging sounds from your water heater.

Flush the Tank

If minerals have built up in your tank, flushing out those deposits can help quiet down the sound of boiling water and sediment hitting other surfaces within your appliance.

Sediment building up on the bottom of your tank can cause loud rattling when it’s heated, so make sure to flush out any sediment periodically using a hose connected directly to the drain valve at the bottom of your tank.

Replace parts

Depending on what noises you’re hearing, replacing certain components, such as heating elements or dip tubes, may be necessary after inspecting them for wear-and-tear damage over time that could also contribute to loud noises coming from inside your appliance.

Insulate pipes

Caulk around exposed piping connections where possible and insulate hot water pipes with foam pipe insulation covers. This will help reduce tapping noises and keep heated water hotter for longer, saving energy over time!

DIY vs. Professional Repair & Maintenance Options

When your water heater makes noise, you may wonder if it’s time to repair or replace the unit. DIY repair and maintenance options are available, but they can be tricky and often require specialized tools. If you do not have experience in plumbing repairs, it is best to consult a professional.

With any DIY project, there is always the risk of error; however, a water heater repair can lead to costly damages due to the mishandling of electricity and gas connections.

Professional plumbers are highly trained in all aspects of water heater installations and repairs so that nothing goes wrong. They will also ensure that all safety standards are met when dealing with the electrical or gas components of your home’s heating system.

Professional plumbers can also help diagnose problems quickly as they understand what each component does and how they relate together to keep your hot water running smoothly at all times.

Furthermore, experienced professionals have access to more advanced tools than those available for DIY projects, allowing them to complete the job faster and with greater precision than if attempted by an amateur homeowner using only basic hand tools.

As such, hiring a qualified technician allows for quick resolution without needing guesswork on wiring, thermostat calibration, or other very technical tasks involved in replacing parts as part of an effective service call

Water Heater Making Noise Summary

Noise from a water heater can be alarming for homeowners, but it’s not always indicative of a major issue. In most cases, the noise is caused by air bubbles in the system or sediment buildup on the bottom of the tank.

To reduce or eliminate noise from your water heater, start by draining and flushing out any built-up sediment that may have accumulated at the bottom of your tank. This should help to quiet down any rumbling or knocking noises you hear when hot water is used within your home.

If this doesn’t solve the problem, examine other potential causes, such as air pockets trapped in pipes or valves inside your system. Insulating them with foam can act as a sound barrier and block out most sounds emitted from your appliance.

If these solutions do not work, consider having a professional inspect for deeper issues, such as an overworked motor or loose components inside the unit.