Have you ever heard a loud banging or knocking sound coming from your pipes when you turn off a tap or an appliance? That unsettling noise is known as water hammer, and it can be a sign of a serious plumbing issue. While it may seem harmless at first, ignoring water hammer can lead to long-term damage to your pipes and plumbing fixtures.
At The Plumbing Doctor, our experienced plumbers in Burleigh Heads have helped countless homeowners resolve water hammer issues and restore peace and quiet to their homes. In this blog, we’ll explain what causes water hammer, why it’s a problem, and how you can fix it.
Water hammer, also known as hydraulic shock, occurs when the flow of water is suddenly stopped or redirected within your plumbing system. This abrupt change in pressure causes water to slam against the walls of your pipes, creating a loud banging noise.
This typically happens when:
Water hammer can be more than just a nuisance—it can weaken pipes, loosen fittings, and eventually lead to leaks or bursts if left unaddressed.
Understanding what causes water hammer is the first step in fixing the issue. Here are the most common reasons for water hammer in homes:
Excessively high water pressure can increase the likelihood of water hammer. If the pressure is too strong, the force of the water stopping abruptly can cause serious vibrations within the pipes.
Old or malfunctioning valves, such as solenoid valves in dishwashers and washing machines, can cause water hammer by shutting off too quickly.
Air chambers are small, vertical pipes that act as shock absorbers within your plumbing system. Over time, these can become waterlogged or ineffective, leading to increased pipe noise.
If your pipes are not properly secured, the sudden movement caused by water hammer can cause them to knock against walls, creating loud banging sounds.
If you have older pipes or outdated plumbing infrastructure, sudden changes in water direction or flow can increase the risk of water hammer.
The good news is that water hammer can usually be fixed with the right approach. Here are some of the most effective solutions:
A water hammer arrestor is a device designed to absorb the shock of sudden water stoppage. It consists of a small, air-filled chamber that cushions the water, preventing the banging noise. A licensed plumber in Burleigh Heads can install one near problem areas, such as dishwashers, washing machines, or fast-closing taps.
If your water pressure is too high, it can increase the risk of water hammer. You can check your home’s water pressure using a gauge or ask a Burleigh Heads plumber to assess it for you. If it’s above 500 kPa, a pressure-reducing valve (PRV) can be installed to bring it down to a safe level.
If your plumbing system has air chambers that have become waterlogged, draining your system can help restore their effectiveness:
This can help restore the air pockets that prevent water hammer.
If your pipes are not properly secured, the vibrations from water hammer can cause them to knock against walls and other surfaces. Installing pipe brackets or cushioning them with foam can help minimise movement and noise.
If your appliances have worn-out solenoid valves, replacing them with slow-closing valves can reduce the sudden water stoppage that causes water hammer. A plumber in Burleigh Heads can assess your valves and replace any faulty ones to prevent further issues.
While some minor water hammer issues can be resolved with DIY methods, persistent or severe cases require professional assistance. If you’re experiencing:
It’s time to call The Plumbing Doctor. Our expert Burleigh Heads plumbers can assess your plumbing system, diagnose the root cause of water hammer, and provide tailored solutions to protect your home.
Water hammer may start as a minor annoyance, but if left untreated, it can lead to serious plumbing damage. By understanding its causes and taking proactive steps to address the issue, you can prevent costly repairs and enjoy a quieter, more efficient plumbing system.
If you need professional help, don’t hesitate to contact The Plumbing Doctor—your trusted plumber in Burleigh Heads. We’ll ensure your pipes are safe, secure, and free from water hammer problems.
