Hot Water Cylinder Leaking? What NZ Homeowners Should Know

A leaking hot water cylinder can quickly turn from a minor inconvenience into a costly plumbing issue. It wastes water, increases your power bill, and can cause serious home damage if ignored.

At Water Works, many homeowners contact us after noticing water pooling around their hot water cylinder or dripping from underneath. This guide explains the common reasons your cylinder may be leaking, what it means when the leak comes from the bottom, and when it might be time to consider a full hot water cylinder replacement.

Common Signs of a Leak

Not all leaks are obvious. Look for:

• Dampness or puddles near the cylinder base
• Rust or corrosion on fittings and pipes
• Hissing or dripping sounds
• Fluctuating water pressure or temperature
• Unexpectedly high water or power bills

If you spot any of these, arrange an inspection right away. Early detection prevents major water or electrical damage.

Why Hot Water Cylinders Leak

A hot water cylinder leaking can result from several issues. From loose connections to internal corrosion:

• Loose Pipe Connections - Over time, fittings expand and contract, causing leaks. Tightening or replacing them often solves the issue.
• Faulty TPR Valve - The temperature-and-pressure relief valve releases excess pressure. A continuous drip usually means it needs replacement.
• Corrosion or Rust - Older tanks often corrode internally. Once rust appears, the cylinder must usually be replaced.
• Internal Tank Failure - A hot water cylinder leaking from the bottom often indicates a cracked inner tank, this cannot be repaired safely.
• High Water Pressure - Excessive pressure strains the system. Installing a pressure-reducing valve helps protect the tank.

What to Do If Your Hot Water Cylinder Leaks

If your leaking hot water cylinder needs urgent attention:

1. Turn Off the Power - For electric systems, switch off power at the breaker to avoid hazards.
2. Turn Off the Water - Close the isolation valve near the cylinder to stop the flow.
3. Avoid DIY Repairs - Hot water systems are pressurised and potentially dangerous.
4. Call a Licensed Plumber - Contact Water Works to locate the fault and determine whether repair or replacing your hot water cylinder is required.

When to Replace Your Hot Water Cylinder

Replacement is often the smartest and safest choice if:

• The bottom of the cylinder is leaking
• The tank is more than 10-15 years old
• Water is rusty or discoloured
• Repairs cost nearly as much as a new unit

When replacing your hot water cylinder, our plumbers recommend modern, energy-efficient systems that reduce running costs and suit New Zealand homes.

Preventing Future Leaks

Minimize future issues by:

• Scheduling annual maintenance
• Flushing the tank to remove sediment
• Installing a pressure-reducing valve
• Keeping the area dry and well-ventilated

Routine care ensures water cylinders are designed to operate efficiently and safely for years.

Call Water Works for Cylinder Repairs or Replacement

Even a small leak can quickly worsen. If your hot water cylinder is leaking, contact Water Works for expert assessment. Our licensed plumbers repair and replace leaking hot water cylinders across Auckland and nearby areas, offering fast response, honest advice, and guaranteed workmanship.

Not sure whether to repair or begin replacing your hot water cylinder? We’ll inspect the system and recommend the most cost-effective solution.

Call us today or book online to save $15. Our 24/7 emergency plumbers are always ready to help with leaks, repairs, and replacements across Auckland.