Expert Plumbing Tips on How to Fix Water Hammer

The banging sound in your pipes is not something to ignore. It is a common plumbing issue in Australian homes known as water hammer. Homeowners often notice knocking sounds when taps close or appliances stop filling.

Here we outline what “water hammer” is, why it occurs, the damage it can cause and how to stop water hammer in your home.

What Is a Water Hammer?

A water hammer is the loud banging or knocking sound that happens when water flow is suddenly stopped or changed. This sudden stop creates a shockwave that travels through your plumbing, making pipes vibrate and echo.



It’s more than just an annoying sound. It’s pressure stressing your plumbing system. Learning how to fix water hammer is important because if ignored, the pressure can lead to costly repairs over time.

Is There a Water Hammer Fix?

Yes, there are proven methods to stop or fix water hammer, but the right approach depends on what’s causing it. Sometimes it’s as simple as lowering water pressure, while other cases require professional repairs or new fittings.

Proper diagnosis is essential in learning how to fix water hammer. A qualified plumber can identify the source quickly and provide a long-term solution that protects your home.

Common Causes of Water Hammer

Water hammer is not caused by one single problem. Several plumbing issues can trigger it, and most are easy to overlook.

Hot Water System Valves

When hot water system malfunctions occur, such as valves opening or closing too quickly, they can cause sudden pressure changes throughout the system. This shift sends a shockwave through the pipes.

Fast Closing Valves

Modern mixer taps, dishwashers and washing machines shut off water flow almost instantly. This abrupt stop produces shockwaves that travel through the pipes.

High Water Pressure

Excessive pressure makes the shockwave stronger. It also puts extra strain on joints and fittings.

Damaged Tapware or Washers

Worn or loose washers and taps disrupt water flow and can trigger vibrations. Replacing faulty tapware often fixes the issue.

Loose Pipes

Pipes that aren’t properly secured move and rattle when water surges through them. This movement makes the banging sound even louder.

Blocked Aerators

Dirt or mineral build-up restricts water flow in taps. The uneven pressure that results can lead to water hammer.

Entrapped Air in Pipes

Air pockets inside the plumbing system can cause surging and knocking noises. Bleeding the system usually solves this problem.

Faulty or Old Pressure Reducing Valves

Valves that no longer regulate water pressure consistently may cause sudden changes in flow. This leads to ongoing hammering in the pipes.

Long Pipe Runs with Sharp Bends

When water travels quickly through long or sharply angled pipes, it creates turbulence. That turbulence can increase the severity of water hammer.

Sudden Appliance Shut-Off

Appliances like washing machines and ice makers close their valves abruptly. The rapid stop in flow generates shockwaves strong enough to shake the pipes.

Effects of Water Hammer

The noise from water hammer is frustrating enough. These are not just harmless sounds, as they can cause costly damage and everyday disruption in your home.

Leaks

Constant vibration at joints and fittings weakens seals over time. Small leaks can go unnoticed, leading to water waste and hidden damage.

Ruptured Pipes

Continuous shock puts stress on pipe walls. Over time, this pressure can cause pipes to crack or burst.

Property Damage

Burst pipes release water into walls, ceilings, and cabinetry. Repairs are often expensive and invasive.

Downtime

Major repairs require shutting off water, disrupting daily routines. This is especially inconvenient for families during peak usage times.

Increased Wear on Appliances

Pressure surges shorten the lifespan of washing machines and dishwashers. Repairs and replacements add extra costs.

Mould and Dampness

Hidden leaks create moist spaces behind walls and floors. These conditions often lead to mould growth.

Unpleasant Noise

The loud banging can disturb daily routines. For many households, it even disrupts sleep.

Higher Water Bills

A burst water pipe wastes large amounts of water without being obvious. Over time, water bills increase without warning.

Structural Damage Over Time

Older and multi-storey homes are most at risk. Long-term hammering weakens building materials and structure.

Tips on How to Stop Water Hammer

A water hammer fix can be straightforward or complex. In some cases, only a licensed plumber can work it safely.



Repair/Replace Faulty Fixtures

Old or broken taps and valves can disrupt water flow and trigger hammering. Replacing them with quality fixtures often provides an immediate fix.

Limit Water Pressure

Excessive pressure is a leading cause of water hammer. Installing a pressure-reducing valve stabilises flow and protects both pipes and appliances.

Secure Loose Pipes

Pipes that aren’t firmly fixed rattle when water surges. Strapping them to wall studs or using brackets prevents movement and reduces noise.

Install Water Hammer Arrestors

These devices absorb shockwaves when water flow is suddenly stopped. They work especially well with appliances such as washing machines and dishwashers.

Install Air Relief Valves

An air relief valve is an effective method on how to stop water hammer. It releases trapped air from the system, restoring smooth and consistent water flow.

Install Air Chambers

Vertical air chambers act as cushions, softening the sudden impact of fast-closing valves. They can be installed in specific problem areas to control hammering.

Bleed the Plumbing System

Trapped air pockets inside pipes often cause surging and banging. Bleeding the system clears these pockets and restores balance.

Service the Hot Water System

Tempering valves and relief valves in hot water units can malfunction over time. Regular servicing keeps them working properly and reduces hammering.

Check and Clean Aerators

Blocked or dirty aerators restrict water flow and increase pressure fluctuations. Cleaning them regularly helps maintain balanced water pressure.

Professional Servicing

For lasting results, it’s best to call in licensed plumbers like us. We diagnose the root cause and provide long-term solutions tailored to your home.

Looking for Experts That Know How to Fix Water Hammer? Contact Eze-Flow Plumbing

Eze-Flow Plumbing is your trusted local expert in providing the right water hammer fix. Our licensed team also handles burst pipes and leaks, tap repairs &replacements and stormwater solutions. We work efficiently, meet all safety standards and leave your home clean and tidy when we’re done.

We operate across Sydney’s North Shore, Northern Beaches and surrounding suburbs, trusted by homeowners for fast response, reliable workmanship and clear communication.

Book a professional inspection with us today.

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